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Type of automaton
of theoretical computer science, a pushdown automaton (PDA) is a type of automaton that employs a stack. Pushdown automata are used in theories about
Pushdown_automaton
Abstract machine in computer science
theory, a deterministic pushdown automaton (DPDA or DPA) is a variation of the pushdown automaton. The class of deterministic pushdown automata accepts the
Deterministic pushdown automaton
Deterministic_pushdown_automaton
Type of finite automaton in automata theory
powerful than DFAs. A pushdown automaton that is allowed to move either way on its input tape is called two-way pushdown automaton (2PDA); it has been studied
Two-way_finite_automaton
Type of finite-state machine in automata theory
input automaton). NFAs have been generalized in multiple ways, e.g., nondeterministic finite automata with ε-moves, finite-state transducers, pushdown automata
Nondeterministic finite automaton
Nondeterministic_finite_automaton
Study of abstract machines and automata
pushed and popped. This kind of automaton is called a pushdown automaton. Queue memory: An automaton may have memory in the form of a queue. Such a machine
Automata_theory
An embedded pushdown automaton (EPDA) is a computational model for parsing languages generated by tree-adjoining grammars (TAGs). It is similar to the
Embedded_pushdown_automaton
Topics referred to by the same term
Pushdown may refer to: Pushdown automaton, a concept in theoretical computer science More generally, anything relating to a stack Push-down (exercise)
Pushdown
Hierarchy of classes of formal grammars
exactly all languages that can be recognized by a non-deterministic pushdown automaton. Context-free languages—or rather its subset of deterministic context-free
Chomsky_hierarchy
Formal language concept
notion of a deterministic visibly pushdown automaton is a restriction of the notion of a deterministic pushdown automaton. Following Alur and Madhusudan
Nested_word
Mathematical model of computation
finite automaton Communicating finite-state machine Control system Control table Decision tables DEVS Hidden Markov model Petri net Pushdown automaton Quantum
Finite-state_machine
Computation model, equivalent to Turing machines
retrieve data from an infinite-memory queue. Its design is similar to a pushdown automaton but differs by replacing the stack with this queue. A queue machine
Queue_automaton
Ability to solve a problem by an effective procedure
possible to prove that any NFA is reducible to an equivalent DFA. Pushdown automaton Similar to the finite state machine, except that it has available
Computability
Subset of languages in formal theory
are context-free languages that can be accepted by a deterministic pushdown automaton. DCFLs are always unambiguous, meaning that they admit an unambiguous
Deterministic context-free language
Deterministic_context-free_language
Formal language generated by context-free grammar
pushdown automata, which makes these languages amenable to parsing. Further, for a given CFG, there is a direct way to produce a pushdown automaton for
Context-free_language
Concept in theoretical computer science
have a complement pushdown automaton. Decidability: Is there an algorithm that takes as input an automaton A and performs automaton complementation (i
Complementation_of_automata
Type of pumping lemma
a given language is context-free, it is sufficient to construct a pushdown automaton that accepts it. Kreowski 1979. Berstel et al. 2009. Scheinberg 1960
Pumping lemma for context-free languages
Pumping_lemma_for_context-free_languages
Any type of calculation
the following: State models including Turing machine, pushdown automaton, finite-state automaton, and PRAM Functional models including lambda calculus
Computation
Educational software
context-free language include: pushdown automata context-free grammar proof on wikt:nondeterministic pushdown automaton to context-free grammar proof on
JFLAP
Sequence that reads the same forwards and backwards
finite automaton to reliably test for palindromes. In addition, the set of palindromes may not be reliably tested by a deterministic pushdown automaton which
Palindrome
Class of artificial neural network
Guo-Zheng; Giles, C. Lee; Chen, Hsing-Hen (1998). "The Neural Network Pushdown Automaton: Architecture, Dynamics and Training". In Giles, C. Lee; Gori, Marco
Recurrent_neural_network
Finite-state machine
automaton (DFA)—also known as deterministic finite acceptor (DFA), deterministic finite-state machine (DFSM), or deterministic finite-state automaton
Deterministic finite automaton
Deterministic_finite_automaton
Symbols for constants, special functions
metric connection the stack alphabet in the formal definition of a pushdown automaton, or the tape-alphabet in the formal definition of a Turing machine
Greek letters used in mathematics, science, and engineering
Greek_letters_used_in_mathematics,_science,_and_engineering
with embedded pushdown automata, which have less computational power.[citation needed] A (nondeterministic two-way) nested stack automaton is a tuple ⟨Q
Nested_stack_automaton
Form for context-free grammars
language can be accepted by a real-time (non-deterministic) pushdown automaton, i.e., the automaton reads a letter from its input every step. Given a grammar
Greibach_normal_form
Computation model defining an abstract machine
Turing machine.) A Turing machine is equivalent to a single-stack pushdown automaton (PDA) that has been made more flexible and concise by relaxing the
Turing_machine
Academic subfield of computer science
Context-free grammars specify programming language syntax. Non-deterministic pushdown automata are another formalism equivalent to context-free grammars. Primitive
Theory_of_computation
Abstract data type
Deque automaton (DA) is a finite-state machine equipped with a deque auxiliary memory. It generalizes Pushdown automaton (PDA) (stack automaton) and Queue
Double-ended_queue
language is linear iff it can be generated by a one-turn pushdown automaton – a pushdown automaton that, once it starts popping, never pushes again. Linear
Linear_grammar
Computational problems no algorithm can solve
finite-state automaton with no inputs and two counters that can be incremented, decremented, and tested for zero. Universality of a nondeterministic pushdown automaton:
List_of_undecidable_problems
language – Prolog – PSPACE-complete – Pulse-code modulation (PCM) – Pushdown automaton – Python QuarkXPress – QuickTime – QWERTY R (programming language)
Index_of_computing_articles
Data structure representing a finite set of strings
In computer science, a deterministic acyclic finite state automaton (DAFSA), is a data structure that represents a set of strings, and allows for a query
Deterministic acyclic finite state automaton
Deterministic_acyclic_finite_state_automaton
Formal grammar derived from a deterministic pushdown automaton
useful because they could be parsed sequentially by a deterministic pushdown automaton, which was a requirement due to computer memory constraints. In 1965
Deterministic context-free grammar
Deterministic_context-free_grammar
Type of context-free grammar
grammar is determined by the automaton that accepts it. Deterministic context-free grammars are accepted by deterministic pushdown automata and can be parsed
Ambiguous_grammar
Grammar model in linguistics
using an automaton. Parse Tree: The alignment of the grammar to a sequence. An example of a parser for PCFG grammars is the pushdown automaton. The algorithm
Probabilistic context-free grammar
Probabilistic_context-free_grammar
the pushdown automaton makes a non-deterministic choice to either ignore the configuration or read it completely onto the stack. If the pushdown automaton
Computation_history
Topics referred to by the same term
conducting polymers Predictive analytics, a form of business analytics Pushdown automaton, in automata theory Pancreatic ductal adenocarcinoma, the main type
PDA
Topics referred to by the same term
Nondeterministic Turing machine Nondeterministic pushdown automaton Nondeterministic finite automaton This disambiguation page lists articles associated
Epsilon_transition
American computer scientist (born 1936)
basic question about deterministic pushdown automata: it is decidable whether a given deterministic pushdown automaton accepts a regular language. Lewis
Richard_E._Stearns
were stack machines, which allowed for simpler programming. These pushdown automatons were also implemented in minicomputers and microprocessors later
History_of_computing_hardware
Top-down parser that parses input from left to right
derivations of different words. The LL(k) parser is a deterministic pushdown automaton with the ability to peek on the next k input symbols without reading
LL_parser
Finite-state machine with fifo buffers for memory
systems communicating with each other. A channel system is similar to a pushdown automaton where a queue is used instead of a stack. Those queues are called
Channel system (computer science)
Channel_system_(computer_science)
of "iterated stack automata", pushdown automata that can store the entire state of a lower-order iterated stack automaton in each cell of their stack.
ELEMENTARY
A tree stack automaton (plural: tree stack automata) is a formalism considered in automata theory. It is a finite-state automaton with the additional ability
Tree_stack_automaton
Topics referred to by the same term
that may refer to: Education Professions Development Act Embedded pushdown automaton European Product Design Award This disambiguation page lists articles
EPDA
Grammar formalism
languages that TAGs can generate may be represented by an embedded pushdown automaton. Tree-adjoining grammars are often described as mildly context-sensitive
Tree-adjoining_grammar
Mathematical model describing how an output of a function is computed given an input
Finite-state machines Post machines (Post–Turing machines and tag machines). Pushdown automata Register machines Random-access machines Turing machines Decision
Model_of_computation
automata theory, a tagged deterministic finite automaton (TDFA) is an extension of deterministic finite automaton (DFA). In addition to solving the recognition
Tagged Deterministic Finite Automaton
Tagged_Deterministic_Finite_Automaton
Topics referred to by the same term
Interface Virtual personal assistant, a software agent Visibly pushdown automaton, an automaton model in computer science Voluntary Partnership Agreement,
VPA
Lemma that defines a property of regular languages
cannot be balanced. For every regular language there is a finite-state automaton (FSA) that accepts the language. The number of states in such an FSA are
Pumping lemma for regular languages
Pumping_lemma_for_regular_languages
n {\displaystyle n} -state nondeterministic finite automaton by a deterministic finite automaton requires exactly 2 n {\displaystyle 2^{n}} states in
State_complexity
part of Tomita's algorithm, where it replaces the usual stack of a pushdown automaton. This allows the algorithm to encode the nondeterministic choices
Graph-structured_stack
Abstract grammatical formalism
not explained above. Categorial grammar Combinatory logic Embedded pushdown automaton Link grammar Type shifter Vijay-Shanker, K. and Weir, David J. 1994
Combinatory categorial grammar
Combinatory_categorial_grammar
Topics referred to by the same term
identify, locate, manipulate, format and present data Deterministic pushdown automaton Differential power analysis, a cryptographic attack Pokémon Diamond
DPA
expression Regular grammar Prefix grammar Tree automaton Pushdown automaton Context-free grammar Büchi automaton Chomsky hierarchy Context-sensitive language
List of computability and complexity topics
List_of_computability_and_complexity_topics
Formal grammar
subclass of regular binary tree languages to nested words and visibly pushdown languages. Applications of regular tree grammars include: Instruction selection
Regular_tree_grammar
American computer scientist
context-free grammars, in 1965, she also investigated properties of W-grammars, pushdown automata, and decidability problems. Greibach earned an A.B. degree (summa
Sheila_Greibach
Sequence of characters, data type
automaton restricted Tree stack automaton Embedded pushdown Nondeterministic pushdown Deterministic pushdown Visibly pushdown Finite Counter-free (with aperiodic
String_(computer_science)
Type of a context-free grammar
automaton restricted Tree stack automaton Embedded pushdown Nondeterministic pushdown Deterministic pushdown Visibly pushdown Finite Counter-free (with aperiodic
LL_grammar
Equivalently, it is a language recognised by a local automaton, a particular kind of deterministic finite automaton. Formally, a language L over an alphabet A is
Local language (formal language)
Local_language_(formal_language)
automaton restricted Tree stack automaton Embedded pushdown Nondeterministic pushdown Deterministic pushdown Visibly pushdown Finite Counter-free (with aperiodic
Interchange_lemma
Formal grammar
(Neto) In 1994, Neto introduced the machine he called a structured pushdown automaton, the core of adaptive automata theory as pursued by Iwai, Pistori
Adaptive_grammar
machine (more specifically, by a deterministic finite automaton or a nondeterministic finite automaton) constructed from a regular expression. In particular
Comparison of parser generators
Comparison_of_parser_generators
automaton restricted Tree stack automaton Embedded pushdown Nondeterministic pushdown Deterministic pushdown Visibly pushdown Finite Counter-free (with aperiodic
Kuroda_normal_form
Computer science and linguistics concept relating to non-terminal production
automaton restricted Tree stack automaton Embedded pushdown Nondeterministic pushdown Deterministic pushdown Visibly pushdown Finite Counter-free (with aperiodic
Recursive_grammar
Ability of a computing system to simulate Turing machines
a computer's instruction set, a programming language, or a cellular automaton) is said to be Turing-complete or computationally universal if it can
Turing_completeness
Type of formal grammar
automaton restricted Tree stack automaton Embedded pushdown Nondeterministic pushdown Deterministic pushdown Visibly pushdown Finite Counter-free (with aperiodic
Noncontracting_grammar
String rewriting system
automaton restricted Tree stack automaton Embedded pushdown Nondeterministic pushdown Deterministic pushdown Visibly pushdown Finite Counter-free (with aperiodic
Semi-Thue_system
automaton restricted Tree stack automaton Embedded pushdown Nondeterministic pushdown Deterministic pushdown Visibly pushdown Finite Counter-free (with aperiodic
Growing context-sensitive grammar
Growing_context-sensitive_grammar
Concept in generalized context free grammar
automaton restricted Tree stack automaton Embedded pushdown Nondeterministic pushdown Deterministic pushdown Visibly pushdown Finite Counter-free (with aperiodic
Head_grammar
Theorem in algebra
no. 7, 1330–1368 D. E. Muller, and P. E. Schupp, The theory of ends, pushdown automata, and second-order logic. Theoretical Computer Science 37 (1985)
Muller–Schupp_theorem
Rule system for formal languages
CFG G, such that L = L ( G ) {\displaystyle L=L(G)} . Non-deterministic pushdown automata recognize exactly the context-free languages. The grammar G =
Context-free_grammar
Formal language models
languages generated by tree-adjoining grammar can be characterized by embedded pushdown automata. Tree-adjoining grammar (TAG) Head grammar (HG) Linear indexed
Mildly context-sensitive grammar formalism
Mildly_context-sensitive_grammar_formalism
PUSHDOWN AUTOMATON
PUSHDOWN AUTOMATON
Surname or Lastname
English
English : habitational name from Ashdon in Essex, Ashdown Forest in East Sussex, or Ashdown in Berkshire (now lost). The first two are named from Old English æscen ‘growing with ash trees’ + dūn ‘hill’. The last may be from an Old English personal name Æsc or Old English æsc ‘ash tree’ + dūn ‘hill’.
PUSHDOWN AUTOMATON
PUSHDOWN AUTOMATON
Girl/Female
Hindu, Indian
A Beautiful Angel of Love; God's Special Gift; Fathers Pride.
Boy/Male
Indian, Sanskrit
Conqueror of Baka; Another Name for Bhima
Girl/Female
Latin
Mother of Pelops.
Boy/Male
Hindu
Acceptable heart
Girl/Female
Hindu, Indian, Malayalam, Marathi, Traditional
Who Possesses; Self-respect
Boy/Male
Muslim
One of the 99 names of God, Forgiving
Boy/Male
Tamil
Great
Boy/Male
American, British, English
Energetic; Active
Boy/Male
British, English
From the Wether-sheep Corner
Girl/Female
Australian, Danish, German, Greek, Scandinavian, Swedish
Pearl; Mother
PUSHDOWN AUTOMATON
PUSHDOWN AUTOMATON
PUSHDOWN AUTOMATON
PUSHDOWN AUTOMATON
PUSHDOWN AUTOMATON
a.
Pertaining to, or produced by, an automaton; of the nature of an automaton; self-acting or self-regulating under fixed conditions; -- esp. applied to machinery or devices in which certain things formerly or usually done by hand are done by the machine or device itself; as, the automatic feed of a lathe; automatic gas lighting; an automatic engine or switch; an automatic mouse.
adv.
See Upsodown.
v. i.
Any thing or being regarded as having the power of spontaneous motion or action.
n.
A machine or automaton in the form of a human being.
adv.
Upside down.
pl.
of Automaton
v. i.
A self-moving machine, or one which has its motive power within itself; -- applied chiefly to machines which appear to imitate spontaneously the motions of living beings, such as men, birds, etc.
pl.
of Automaton