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Context-Free Grammar Definitions: Yields, Ambiguous, Leftmost Derivation 3 года назад


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

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. Donation (appears on streams): https://streamlabs.com/easytheory1/tip Paypal: https://paypal.me/easytheory Patreon:   / easytheory   Discord:   / discord   #easytheory #gate #theory Youtube Live Streaming (Sundays) - subscribe for when these occur. Social Media: Facebook Page:   / easytheory   Facebook group:   / easytheory   Twitter:   / easytheory   Merch: Language Hierarchy Apparel: https://teespring.com/language-hierar... Pumping Lemma Apparel: https://teespring.com/pumping-lemma-f... If you like this content, please consider subscribing to my channel:    / @easytheory   Gold Supporters: Micah Wood Silver Supporters: Timmy Gy ▶SEND ME THEORY QUESTIONS◀ [email protected] ▶ABOUT ME◀ I am a professor of Computer Science, and am passionate about CS theory. I have taught many courses at several different universities, including several sections of undergraduate and graduate theory-level classes.

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