Tag
closure-properties
- Aug 16, 2026 Closure Gaps in Context-Free Languages Context-free languages are closed under union and star but not under intersection or complement, and the two failures are the same failure seen from two sides. computation theory
- Sep 19, 2025 Recognizers, Dovetailing, and Complement Asymmetry Why a machine that halts on every yes-instance but may loop on no-instances cannot be closed under complement, and how interleaved simulation converts a recognizer into one for a different set. computation theory
- Sep 2, 2025 Alphabets, Strings, and the Closure Properties That Define a Language Class Why formal languages are studied as sets of strings, how closure under composition operations determines what a class can express, and why descriptions rather than sets carry the theory. computation theory
- Mar 10, 2023 Product Constructions: Intersection, Union, and Complement Without Rebuilding How pairing states from two machines computes a boolean operation on their languages, why complement needs a total transition function, and what the product costs in states. computation theory