Context-Free Grammar for a Nonregular Language
đ± The Classic Nonregular Language: L = { aâż bâż | n â„ 0 } This language contains strings like:
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Category: Theory of Computation
Properly Nested Parentheses â Context-Free Languages
đ± What Does âProperly Nestedâ Mean? A string of parentheses is properly nested if: Here are examples: â Proper: (),
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Context-Free Grammars â Context-Free Languages
đ± What Is a Context-Free Language? A Context-Free Language is a set of strings that can be generated from a
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Context-Free Languages â Theory of Computation
đ± What Is a Context-Free Language? A Context-Free Language (CFL) is a type of formal language that can be generated
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Proof of Higmanâs Theorem â Theory of Computation
đ± What Weâre Trying to Prove We want to show: All strings built from a well-quasi-ordered alphabet are also well-quasi-ordered
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Dicksonâs Theorem Theory of Computation
â What Higmanâs Theorem Says (in human words) Here is the gentle version: If your alphabet is nicely ordered, then
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Higmanâs Theorem â Theory of Computation
đ± what is the idea behind the theorem? Higmanâs Theorem is about sequences (think: strings made from alphabets) and how
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Applications of the Pumping Lemma
â Why Do We Use the Pumping Lemma? We use it mainly for one big purpose: ⊠To prove that
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Pumping Lemma and Nonregular Languages
đ± What Is the Pumping Lemma? (In simple words) Think of a DFA like a small machine with a fixed
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Equivalence of Regular Expressions and Regular Languages
đŒ The Big Idea (in simple words) Think of a regular expression (RE) as a recipe.It tells you how to
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