Isabelle-91
نویسندگان
چکیده
Min introduces the type form (of object-formulae) and the infix constant −→ (for objectimplication). The constant [[ ]] maps form to the predefined type prop of meta-logic propositions. The proposition [[P ]] should be read as “the formula P is true”; we usually distinguish object-level formulae (form) from meta-level formulae (prop). In practice the brackets can be dropped; parser and pretty-printer take care of such matters. The two rules for minimal logic are typical natural deduction rules for implication introduction and elimination, which are usually written as follows:
منابع مشابه
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