Context-Free Grammar That Verifies Addition
đ± What Does It Mean to Verify Addition? Imagine you have a string like: We want a grammar that accepts
Continue reading
Category: IT
Context-Free Grammar (CFG) for the Complement of a Non-Regular Language
Letâs explore this using a famous non-regular language, then see how to build a context-free grammar (CFG) for its complement.
Continue reading
Context-Free Grammar for a Nonregular Language
đ± The Classic Nonregular Language: L = { aâż bâż | n â„ 0 } This language contains strings like:
Continue reading
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: (),
Continue reading
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
Continue reading
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
Continue reading
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
Continue reading
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
Continue reading
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
Continue reading
Applications of the Pumping Lemma
â Why Do We Use the Pumping Lemma? We use it mainly for one big purpose: ⊠To prove that
Continue reading