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Mathematical function such that every output has at least one input
mathematics, a surjective function (also known as surjection, or onto function /ˈɒn.tuː/) is a function f such that, for every element y of the function's codomain
Surjective_function
Properties of mathematical functions
domain; that is, if the image and the codomain of the function are equal. A surjective function is a surjection. Notationally: ∀ y ∈ Y , ∃ x ∈ X , y =
Bijection, injection and surjection
Bijection,_injection_and_surjection
Subset of a function's codomain
of a function are the same set; such a function is called surjective or onto. For any non-surjective function f : X → Y , {\displaystyle f:X\to Y,} the
Range_of_a_function
Function that preserves distinctness
injective non-surjective function (injection, not a bijection) An injective surjective function (bijection) A non-injective surjective function (surjection
Injective_function
One-to-one correspondence
element of Y. Functions which satisfy property (3) are said to be "onto Y " and are called surjections (or surjective functions). Functions which satisfy
Bijection
Systematic classification of 12 related enumerative problems concerning two finite sets
set X is equivalent to counting injective functions N → X when n = x, and also to counting surjective functions N → X when n = x. Counting multisets of
Twelvefold_way
Mathematical concept
{\displaystyle y\in Y} implies that f is surjective. The inverse function f −1 to f can be explicitly described as the function f − 1 ( y ) = ( the unique element
Inverse_function
Surjective homomorphism
analogues of onto or surjective functions (and in the category of sets the concept corresponds exactly to the surjective functions), but they may not exactly
Epimorphism
Mathematical set that can be enumerated
injective function from S {\displaystyle S} to N {\displaystyle \mathbb {N} } . S {\displaystyle S} is empty or there exists a surjective function from N
Countable_set
Association of one output to each input
thus f − 1 ( y ) = { x } . {\displaystyle f^{-1}(y)=\{x\}.} The function f is surjective (or onto, or is a surjection) if its range f ( X ) {\displaystyle
Function_(mathematics)
Operation on mathematical functions
composition of one-to-one (injective) functions is always one-to-one. Similarly, the composition of onto (surjective) functions is always onto. It follows that
Function_composition
Function that returns its argument unchanged
{\displaystyle X} . The identity function on X {\displaystyle X} is clearly an injective function as well as a surjective function (its codomain is also its
Identity_function
Counterexample to the converse of the intermediate value theorem
13 function is an example of a simple-to-define function which takes on every real value in every interval, that is, it is an everywhere surjective function
Conway's_base_13_function
Concept in category theory
In category theory, a point-surjective morphism is a morphism f : X → Y {\displaystyle f:X\rightarrow Y} that "behaves" like surjections on the category
Point-surjective_morphism
Representation of a mathematical function
example, to say that a function is onto (surjective) or not the codomain should be taken into account. The graph of a function on its own does not determine
Graph_of_a_function
Counterintuitive mathematical object
Riemann-integrable. The Peano space-filling curve is a continuous surjective function that maps the unit interval [ 0 , 1 ] {\displaystyle [0,1]} onto
Pathological_(mathematics)
other words, every element of the function's codomain is the image of at most one element of its domain. Surjective function: has a preimage for every element
List_of_types_of_functions
Finite collection of distinct objects
this equivalence. Any injective function between two finite sets of the same cardinality is also a surjective function (a surjection). Similarly, any surjection
Finite_set
Function whose actual domain of definition may be smaller than its apparent domain
partial functions. A partial function is said to be injective, surjective, or bijective when the function given by the restriction of the partial function to
Partial_function
Mathematical term
elements of a set J, then J is an index set. The indexing consists of a surjective function from J onto A, and the indexed collection is typically called an
Index_set
Theorem in mathematics
rank function. Thus the constant rank theorem applies to a generic point of the domain. When the derivative of F is injective (resp. surjective) at a
Inverse_function_theorem
Finitely generated extension field of positive transcendence degree
{\displaystyle K/k} . A discrete valuation of K / k {\displaystyle K/k} is a surjective function v : K → Z ∪ { ∞ } {\displaystyle v:K\to \mathbb {Z} \cup \{\infty
Algebraic_function_field
If there are more items than boxes holding them, one box must contain at least two items
cardinality of S is less than the cardinality of T, then there is no surjective function from S to T. Let q1, q2, ..., qn be positive integers. If q 1 + q
Pigeonhole_principle
Order-preserving mathematical function
In mathematics, a monotonic function (or monotone function) is a function between ordered sets that preserves or reverses the given order. This concept
Monotonic_function
Finite ordered list of elements
{\displaystyle \left(a_{1},\ldots ,a_{n}\right)} may be identified with the surjective function F : { 1 , … , n } → { a 1 , … , a n } {\displaystyle F~:~\left\{1
Tuple
Theorem in set theory
in the picture). If we assume the axiom of choice, then a pair of surjective functions f {\displaystyle f} and g {\displaystyle g} also implies the existence
Schröder–Bernstein_theorem
Complex analysis function
A Nevanlinna function maps the upper half-plane to itself or a real constant, but is not necessarily injective or surjective. Functions with this property
Nevanlinna_function
Theorem equivalent to the Axiom of Choice
well-order. Since the collection of all ordinals such that there exists a surjective function from B {\displaystyle B} to the ordinal is a set, there exists an
Tarski's_theorem_about_choice
Mathematical function characterizing set membership
characteristic function of a subset A of some set X maps elements of X to the codomain { 0 , 1 } . {\displaystyle \{0,\,1\}.} This mapping is surjective only when
Indicator_function
(Mathematical) decomposition into a product
objects. For example, every function may be factored into the composition of a surjective function with an injective function. Matrices possess many kinds
Factorization
Size of a set in mathematics
injective. If a function covers every member in the output set, it is called surjective. If a function is both injective and surjective, it is called bijective
Cardinality
Mathematical function with multiple real-number arguments
In mathematics, a function of several real variables or real multivariate function is a function with more than one argument, with all arguments being
Function of several real variables
Function_of_several_real_variables
Structure-preserving map between two algebraic structures of the same type
epimorphism (surjective) ⟹ epimorphism (right cancelable) ; {\displaystyle {\text{split epimorphism}}\implies {\text{epimorphism (surjective)}}\implies
Homomorphism
Degree of differentiability of a function or map
not surjective) map C k ( M ) → C 0 ( M ) {\displaystyle C^{k}(M)\to C^{0}(M)} . The above spaces occur naturally in applications where functions having
Smoothness
Finest topology making some functions continuous
on a quotient space is a final topology, with respect to a single surjective function, namely the quotient map. The disjoint union topology is the final
Final_topology
Set of functions between two fixed sets
In mathematics, a function space is a set of functions between two fixed sets. Often, the domain and/or codomain will have additional structure which is
Function_space
Infinite set that is not countable
of X not included in it. That is, X is nonempty and there is no surjective function from the natural numbers to X. The cardinality of X is neither finite
Uncountable_set
Target set of a mathematical function
f. The image of a function is a subset of its codomain so it might not coincide with it. Namely, a function that is not surjective has elements y in its
Codomain
Mathematical function
mathematics, a function of a real variable is a function whose domain is a subset of R {\displaystyle \mathbb {R} } . Many real functions that are often
Function_of_a_real_variable
Mathematical space with a notion of closeness
{\displaystyle Y} is a set, and if f : X → Y {\displaystyle f:X\to Y} is a surjective function, then the quotient topology on Y {\displaystyle Y} is the collection
Topological_space
Mathematical function that outputs real values
In mathematics, a real-valued function is a function whose values are real numbers. In other words, it is a function that assigns a real number to each
Real-valued_function
Type of unique identifier
numbering could be thought of as a bijection —that is, an injective and surjective function— from a set of entities onto a set of numerals. Proving a mapping
Nominal_number
Every set is smaller than its power set
there is no surjective function from any set A {\displaystyle A} to its power set. To establish this, it is enough to show that no function f {\displaystyle
Cantor's_theorem
Category theory generalization of fumction factorization
can be shown that every function can be written as the composite of a surjective function followed by an injective function. Factorization systems are
Factorization_system
Mathematical function with no sudden changes
is surjective, this topology is canonically identified with the quotient topology under the equivalence relation defined by f. Dually, for a function f
Continuous_function
Function with a smaller domain
In mathematics, the restriction of a function f {\displaystyle f} is a new function, denoted f | A {\displaystyle f\vert _{A}} or f ↾ A , {\displaystyle
Restriction_(mathematics)
Elementary cellular automaton
saying that Rule 90 is surjective. The function that maps each configuration to its successor is, mathematically, a surjective function. Rule 90 is also not
Rule_90
Branch of topology
if X is a topological space and Y is a set, and if f : X→ Y is a surjective function, then the quotient topology on Y is the collection of subsets of
General_topology
Overview of and topical guide to logic
function Partially ordered set Preorder Prewellordering Propositional function Quasitransitive relation Reflexive relation Serial relation Surjective
Outline_of_logic
Set of all points in a function's domain that all map to some single given point
term. A continuous closed surjective function whose fibers are all compact is called a perfect map. A fiber bundle is a function f {\displaystyle f} between
Fiber_(mathematics)
Study of space and shapes locally given by a convergent power series
\Omega } is a univalent function such that f ( G ) = Ω {\displaystyle f(G)=\Omega } (that is, f {\displaystyle f} is surjective), then the derivative of
Geometric_function_theory
Mathematical concept
\Omega } is a univalent function such that f ( G ) = Ω {\displaystyle f(G)=\Omega } (that is, f {\displaystyle f} is surjective), then the derivative of
Univalent_function
Mathematical property of sets
f\colon I\twoheadrightarrow X} denotes that f {\displaystyle f} is a surjective function from I {\displaystyle I} onto X {\displaystyle X} . The surjection
Subcountability
Mathematical ranking of a set
{\displaystyle X.} Also, f {\displaystyle f} is not assumed to be a surjective function, so a class of equivalent elements on Y {\displaystyle Y} may induce
Weak_ordering
Set with an equinumerous proper subset
(over ZF) conditions: there is a function A → A that is surjective but not injective; there is a surjective function A → A ∪ {A}; it is weakly Dedekind-infinite
Dedekind-infinite_set
Use of filters to describe and characterize all basic topological notions and results
f {\displaystyle f} is not (necessarily) surjective can be reduced down to the case of a surjective function (which is a case that was described at the
Filters_in_topology
{\displaystyle Y} of equal cardinality, thus constituting an injective and surjective function: { ∀ x , x ′ ∈ X , f ( x ) = f ( x ′ ) ⇒ x = x ′ ∀ y ∈ Y , ∃ x ∈
Bidirectional_map
Mathematical approach
element of the frame.) The resulting locale is known as the "locale of surjective functions N → R {\displaystyle \mathbb {N} \to \mathbb {R} } ". The relations
Pointless_topology
All-encompassing set or class
all finite ordinals.) if f : a → b {\displaystyle f:a\to b} is a surjective function with a ∈ U {\displaystyle a\in U} and b ⊆ U {\displaystyle b\subseteq
Universe_(mathematics)
Form of logic that allows quantification over predicates
that the domain is finite, use the sentence that says that every surjective function from the domain to itself is injective. To say that the domain has
Second-order_logic
has a left inverse. For example, the axiom of choice says that any surjective function admits a section. Segal 1. Segal condition. For now, see https://ncatlab
Glossary_of_category_theory
Right inverse of a morphism
every monomorphism (injective function) with a non-empty domain is a section, and every epimorphism (surjective function) is a retraction; the latter statement
Section_(category_theory)
H^{0}(M,{\mathcal {N}})\to H^{0}(M,{\mathcal {N}}/{\mathcal {I}})} is surjective. However H 1 ( M , N ) ≠ 0 , if dim ( M ) > 0 , {\displaystyle H^{1}(M
Nash_function
Binary relation over a set and itself
function (or partial function) is one whose inverse is univalent. A surjective function is one that is right-total. If R is a homogeneous relation over a
Homogeneous_relation
Type of mathematical function
mathematics, a constant function is a function whose (output) value is the same for every input value. As a real-valued function of a real-valued argument
Constant_function
Generalization of additive and multiplicative inverses
a function has a left inverse for function composition if and only if it is injective, and it has a right inverse if and only if it is surjective. In
Inverse_element
Vector space of functions in mathematics
for well-behaved Ω. Note that the trace operator T is in general not surjective, but for 1 < p < ∞ it maps continuously onto the Sobolev–Slobodeckij space
Sobolev_space
Type of residuated Boolean algebra with extra structure
{}}\bullet B=1} Essentially these axioms imply that the universe has a (non-surjective) pairing relation whose projections are A {\displaystyle A} and B {\displaystyle
Relation_algebra
not imply that f is an open function. Quotient space If X is a space, Y is a set, and f : X → Y is any surjective function, then the Quotient topology
Glossary_of_general_topology
Set of the values of a function
In mathematics, for a function f : X → Y {\displaystyle f:X\to Y} , the image is a relation between inputs and outputs, used in three related ways: The
Image_(mathematics)
Locally compact topological field
integer. The normalized valuation of F {\displaystyle F} is the surjective function v : F → Z ∪ { ∞ } {\displaystyle v:F\to \mathbb {Z} \cup \{\infty
Local_field
Geometric transformation that preserves lines but not angles nor the origin
is generated by an axonometry, then f {\displaystyle f} is affine and surjective. Hence it can be represented by [ x y z ] ⟼ [ x ′ y ′ ] = A [ x y z ]
Affine_transformation
Mathematical map between topological spaces
closed maps – Functions that send open (resp. closed) subsets to open (resp. closed) subsets Perfect map – Continuous closed surjective map, each of whose
Proper_map
Algebraic structure
{\displaystyle f\mapsto {\hat {f}}} is injective. Since this mapping is clearly surjective, it is bijective and thus an algebra isomorphism of A and B. Let k be
Ring_of_polynomial_functions
Counting technique in combinatorics
using the principle. Given finite sets A and B, how many surjective functions (onto functions) are there from A to B? Without any loss of generality we
Inclusion–exclusion_principle
Concept in mathematics
g\mapsto g(t^{2}-1,t^{3}-t),} which is seen to be injective (since f is surjective). Continuing the preceding example, let U = A1 − {1}. Since U is the complement
Morphism of algebraic varieties
Morphism_of_algebraic_varieties
Structure-preserving function between two rings
zero object in the category of rings. The function f : Z → Z/nZ, defined by f(a) = [a]n = a mod n is a surjective ring homomorphism with kernel nZ (see Modular
Ring_homomorphism
Surjective bounded operator on a Hilbert space preserving the inner product
In functional analysis, a unitary operator is a surjective bounded operator on a Hilbert space that preserves the inner product. Non-trivial examples include
Unitary_operator
Space-filling curve
discovered, by Giuseppe Peano in 1890. Peano's curve is a surjective, continuous function from the unit interval onto the unit square, however it is
Peano_curve
of symmetric polynomials in n indeterminates. For every n there is a surjective ring homomorphism ρn from the analogous ring R[X1,...,Xn+1]Sn+1 with one
Ring_of_symmetric_functions
Functions that send open (resp. closed) subsets to open (resp. closed) subsets
advisable to always check what definition of "open map" an author is using. A surjective map is relatively open if and only if it is strongly open; so for this
Open_and_closed_maps
Function that takes two inputs
functions can also be generalised to binary functions. For example, the division example above is surjective (or onto) because every rational number may
Binary_function
Test for the injectivity of a function
definition means the function cannot be injective. Variations of the horizontal line test can be used to determine whether a function is surjective or bijective:
Horizontal_line_test
Generalization of the inverse function theorem
if each linearization is only surjective, and a family of right inverses is smooth tame, then P is locally surjective with a smooth tame right inverse
Nash–Moser_theorem
Q". bijective A function that is both injective (no two elements of the domain map to the same element of the codomain) and surjective (every element of
Glossary_of_logic
Map (arrow) between two objects of a category
categories, a function that has a right inverse is surjective. Thus, in concrete categories, epimorphisms are often, but not always, surjective. The condition
Morphism
Number which when multiplied by x equals 1
consists of the same finite number of elements, and the map is necessarily surjective. Specifically, f (namely multiplication by a) must map some element x
Multiplicative_inverse
Type of mathematical functions
neighborhood U {\displaystyle U} in X {\displaystyle X} such that there is a surjective morphism O X ⊕ n | U → F | U {\displaystyle {\mathcal {O}}_{X}^{\oplus
Function of several complex variables
Function_of_several_complex_variables
Differential map between manifolds whose differential is everywhere surjective
differentiable manifolds whose differential pushforward is everywhere surjective. It is a basic concept in differential topology, dual to that of an immersion
Submersion_(mathematics)
Topological vector spaces
{\displaystyle V\neq U} then the restriction mapping is neither injective nor surjective. A distribution S ∈ D ′ ( V ) {\displaystyle S\in {\mathcal {D}}'(V)}
Spaces of test functions and distributions
Spaces_of_test_functions_and_distributions
Index of articles associated with the same name
holomorphic function on a connected open set in the complex plane is an open mapping Open mapping theorem (topological groups), states that a surjective continuous
Open_mapping_theorem
Mathematical function, in linear algebra
map S : W → V such that ST is the identity map on V. T is said to be surjective or an epimorphism if any of the following equivalent conditions are true:
Linear_map
Mathematical concept
\\[8pt]\int _{1}^{0}{\frac {dt}{t}}&=-\infty \end{aligned}}} hold, then it is surjective as well. Indeed, these integrals do hold; they follow from the integral
Characterizations of the exponential function
Characterizations_of_the_exponential_function
Ordered field with a function generalizing the exponential function
{\displaystyle K\,} is exponentially closed if and only if there is a surjective function E 2 : K → K + {\textstyle E_{2}\colon K\rightarrow K^{+}} such that
Ordered_exponential_field
equivariant injective function f : S G → S G {\displaystyle f:S^{G}\to S^{G}} is also surjective. The implication from injectivity to surjectivity is a form of
Surjunctive_group
Distance-preserving mathematical transformation
isometrically isomorphic to a closed subset of some Banach space. An isometric surjective linear operator on a Hilbert space is called a unitary operator. Let X
Isometry
Topological group that is in a certain sense assembled from a system of finite groups
Without loss of generality, these homomorphisms can be assumed to be surjective, in which case the finite groups will appear as quotient groups of the
Profinite_group
Complex exponential in terms of sine and cosine
formula states that the imaginary exponential function t ↦ e i t {\displaystyle t\mapsto e^{it}} is a (surjective) morphism of topological groups from the
Euler's_formula
Continuous surjection satisfying a local triviality condition
product space B × F {\displaystyle B\times F} is defined using a continuous surjective map, π : E → B , {\displaystyle \pi :E\to B,} that in small regions of
Fiber_bundle
Concept in differential geometry
classes of morphisms between diffeological spaces. A subduction is a surjective function f : X → Y {\displaystyle f:X\to Y} between diffeological spaces such
Diffeology
SURJECTIVE FUNCTION
SURJECTIVE FUNCTION
Surname or Lastname
English
English : topographic name for someone who lived by the gates of a medieval walled town. The Middle English singular gate is from the Old English plural, gatu, of geat ‘gate’ (see Yates). Since medieval gates were normally arranged in pairs, fastened in the center, the Old English plural came to function as a singular, and a new Middle English plural ending in -s was formed. In some cases the name may refer specifically to the Sussex place Eastergate (i.e. ‘eastern gate’), known also as Gates in the 13th and 14th centuries, when surnames were being acquired.Americanized spelling of German Götz (see Goetz).Translated form of French Barrière (see Barriere).In New England, Gates was the preferred English version of the name of an extensive French family, called Barrière dit Langevin.
Male
Celtic
, great justiciary, or functionary.
Male
Egyptian
, an Egyptian functionary.
Surname or Lastname
English
English : nickname from the animal, Middle English catte ‘cat’. The word is found in similar forms in most European languages from very early times (e.g. Gaelic cath, Slavic kotu). Domestic cats were unknown in Europe in classical times, when weasels fulfilled many of their functions, for example in hunting rodents. They seem to have come from Egypt, where they were regarded as sacred animals.English : from a medieval female personal name, a short form of Catherine.Variant spelling of German and Dutch Katt.
Surname or Lastname
English
English : occupational name for a dresser of cloth, Old English fullere (from Latin fullo, with the addition of the English agent suffix). The Middle English successor of this word had also been reinforced by Old French fouleor, foleur, of similar origin. The work of the fuller was to scour and thicken the raw cloth by beating and trampling it in water. This surname is found mostly in southeast England and East Anglia. See also Tucker and Walker.In a few cases the name may be of German origin with the same form and meaning as 1 (from Latin fullare).Americanized version of French Fournier.Samuel Fuller (1589–1633), born in Redenhall, Norfolk, England, was among the Pilgrim Fathers who sailed on the Mayflower in 1620. He was a deacon of the church and until his death functioned as Plymouth Colony’s physician.
Boy/Male
Buddhist, Indian, Japanese
Mysterious Function
Male
Egyptian
, a great functionary.
Male
Egyptian
, Functionary of the Interior.
Male
Egyptian
, an Egyptian functionary.
Male
Egyptian
, a high Egyptian functionary.
Male
Egyptian
, the son of the functionary Heknofre.
Biblical
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Surname or Lastname
English (chiefly Kent and Sussex)
English (chiefly Kent and Sussex) : occupational name for a designer or engineer, from a Middle English reduced form of Old French engineor ‘contriver’ (a derivative of engaigne ‘cunning’, ‘ingenuity’, ‘stratagem’, ‘device’). Engineers in the Middle Ages were primarily designers and builders of military machines, although in peacetime they might turn their hands to architecture and other more pacific functions.German : from the Latin personal name Januarius (see January 1). Jänner is a South German word for ‘January’, and so it is possible that this is one of the surnames acquired from words denoting months of the year, for example by converts who had been baptized in that month, people who were born or baptized in that month, or people whose taxes were due in January.
SURJECTIVE FUNCTION
SURJECTIVE FUNCTION
Girl/Female
Biblical
The fire of the idol, or of the ruler.
Girl/Female
Indian
Holy girl
Girl/Female
Hindu, Indian
Power; Type of Shakti; Sensitive
Female
Hebrew
Variant form of Hebrew Ushara, USHERET means "fortunate."
Girl/Female
Indian
Traveler
Boy/Male
Biblical
Brother of the morning or dew; brother of blackness.
Biblical
suspension of the plow
Girl/Female
Hindu, Indian
Wish
Male
English
Anglicized form of Greek AmÅs, AMOS means "strong." In the New Testament bible, this is the name of an ancestor of Christ.
Boy/Male
Norse
Blood brother of Bjolf.
SURJECTIVE FUNCTION
SURJECTIVE FUNCTION
SURJECTIVE FUNCTION
SURJECTIVE FUNCTION
SURJECTIVE FUNCTION
adv.
In a functional manner; as regards normal or appropriate activity.
a.
Remaining within; inherent; indwelling; abiding; intrinsic; internal or subjective; hence, limited in activity, agency, or effect, to the subject or associated acts; -- opposed to emanant, transitory, transitive, or objective.
n.
Any philosophical doctrine which refers all knowledge to, and founds it upon, any subjective states; egoism.
n.
One charged with the performance of a function or office; as, a public functionary; secular functionaries.
a.
Pertaining to the function of an organ or part, or to the functions in general.
n.
The quality or state of being subjective; character of the subject.
v. i.
Alt. of Functionate
a.
Depending upon the internal constitution of a body or entity; subjective.
n.
The appropriate action of any special organ or part of an animal or vegetable organism; as, the function of the heart or the limbs; the function of leaves, sap, roots, etc.; life is the sum of the functions of the various organs and parts of the body.
pl.
of Functionary
a.
Of or pertaining to an object; contained in, or having the nature or position of, an object; outward; external; extrinsic; -- an epithet applied to whatever ir exterior to the mind, or which is simply an object of thought or feeling, and opposed to subjective.
a.
Modified by, or making prominent, the individuality of a writer or an artist; as, a subjective drama or painting; a subjective writer.
a.
Especially, pertaining to, or derived from, one's own consciousness, in distinction from external observation; ralating to the mind, or intellectual world, in distinction from the outward or material excessively occupied with, or brooding over, one's own internal states.
n.
One skilled in subjective philosophy; a subjectivist.
a.
Pertaining to, or connected with, a function or duty; official.
a.
Of or pertaining to a subject.
v. t.
To assign to some function or office.
n.
A quantity so connected with another quantity, that if any alteration be made in the latter there will be a consequent alteration in the former. Each quantity is said to be a function of the other. Thus, the circumference of a circle is a function of the diameter. If x be a symbol to which different numerical values can be assigned, such expressions as x2, 3x, Log. x, and Sin. x, are all functions of x.
a.
Destitute of function, or of an appropriate organ. Darwin.
v. i.
To execute or perform a function; to transact one's regular or appointed business.