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Local Definitions

(mlets x = T: P) (P mlets x = T)

• Term T, any phrase (term or formula) P.
• Variable x bound by "block quantifier" let/where.
• Alternative forms:
  • Let x be T. Then we have A.
  • Let x be T in P; A, where x=T.
  • let(x = T: A)
• Semantics: identical to the semantics of P with x replaced by T.

  Semantics of P in an extension of the given assignment with x mapped to value of T.