There are many methods to prove that a language is not regular, but what do I need to do to prove that some language is regular? For instance, if I am ...
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Positive: 25 %

How to prove that a language is not regular? up vote 48 down vote favorite. 42. ... To prove that a language $L$ is not regular using closure properties, ...
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Positive: 22 %

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Example. Prove that the regular languages are closed under reversal. That is, if Lis a reg-ular language, then LR = wjwR 2L is a regular language. (Hint ...
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Positive: 25 %

Regular languages are closed under complementation, union, concatenation, Kleene closure, and intersection. Use one of these facts and the given fact that ...
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Positive: 20 %

Proving Languages not to be Regular ... Proving Languages not to be Regular Regular languages has at least ... Proof Suppose L is regular and ...
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Positive: 6 %

Reverse of a Regular Language Proof Grammars Grammars Grammars express languages Example: the English language A derivation of “the boy walks ...
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Positive: 10 %

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The pumping lemma for regular languages is only a tool for showing that a language is not regular; it cannot be used to show that a language is regular.
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Positive: 25 %

Reverse of a Regular Language Proof Grammars Grammars Grammars express languages Example: the English language A derivation of “the boy walks ...
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Positive: 24 %

3 Closure Under Union If L and M are regular languages, so is L M. Proof: Let L and M be the languages of regular expressions R and S, respectively.
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Positive: 19 %

A regular language has a finite ... This is an expanded version of my answer from here Using Pumping Lemma to prove language is not regular since this is ...
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Positive: 12 %

Two Definitions of Regular Languages Proof ... We will focus on two main definitions of the language class regular languages: A language L is regular ...
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Positive: 2 %

Template Example Explanation; PROBLEM: If A is a regular language, show that language A' = { some transformation of A} is also regular. Problem: If A is a ...
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Positive: 10 %

Properties of Regular Language Subjects to be Learned. Closure of the set of regular languages under union, ... A finite language is regular. Proof: ...
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Positive: 10 %

Pumping Lemma is used to prove a language to be not regular. But How a language can be proved to be regular ? In particular, Let L be a language. Define ...
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Positive: 10 %

Given the regular languages L1 and L2, prove that the following language is also regular: I know that U,*,. between 2 regular languages provides a regular ...
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Positive: 10 %

4 Showing that a language is not regular Regular languages are languages which can be recognized ... Proof: For a regular language L there exists a DFA A s ...
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Positive: 10 %

Theorem. A language A is regular if and only if there exists an NFA M such that L(M) = A. Proof. The forward direction is trivial, since A regular means ...
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Positive: 10 %

The Pumping Lemma for Regular Languages . Topics Purpose of this unit Proof of Pumping Lemma Example illustrating proof of Pumping Lemma The Pumping Lemma ...
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Positive: 10 %

Non-Regular Languages Subjects to be Learned. Existence of non-regular languages Myhill ... let us prove that the language L = a k b k is nonregular, ...
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25 %