Context-Free Grammar Definitions: Yields, Ambiguous, Leftmost Derivation

Veröffentlicht am: 04 Oktober 2020
auf dem Kanal: Easy Theory

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Here we are doing a bonus video about context-free grammars (CFGs): yields, ambiguous, and leftmost derivation. They will all be important in upcoming videos. Yields involves the application of a single rule, and a derivation is a sequence of yields operations to yield a string that is only consisting of terminals. A leftmost derivation is one where the leftmost variable is always the one that is replaced. Ambiguous grammars are those that have some string they make that has 2 different leftmost derivations. A language is inherently ambiguous if every CFG for it is ambiguous.

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