A grammar derivation that always expands the leftmost remaining nonterminal symbol. In a context-free grammar, each parse tree specifies exactly one leftmost derivation. Two distinct leftmost derivations of the same word therefore prove that the context-free grammar is an ambiguous grammar.

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  1. Grammar derivation
  2. Context-free grammar
  3. Context-free language
  4. Formal language theory
  5. Foundations of mathematics
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