Prove that the following language is undecidable by giving a reduction from a known undecidable language and showing that this reduction is correct. EQCFG = {(G, H) |G and H are CFGS such that L(G) = L(H)} Hint: give a reduction from ALLCFG = {(G) | G is a CFG and L(G) = E* }

Prove that the following language is undecidable by giving a reduction from a known undecidable language and showing that this reduction is correct. EQCFG = {(G, H) |G and H are CFGS such that L(G) = L(H)} Hint: give a reduction from ALLCFG = {(G) | G is a CFG and L(G) = E* }

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Prove that the following language is undecidable by giving a reduction from a known undecidable
language and showing that this reduction is correct.
EQCFG = {(G, H) | G and H are CFGS such that L(G) = L(H)}
Hint: give a reduction from ALLCFG = {(G)| G is a CFG and L(G) = E* }

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