[sv-ac] Issue 2578: Vacuity definition

Hi all,

I am sorry to reopen the discussion about a resolved issue. Should have done it at the last meeting. There are two problems that I would like to discuss.

1. The following vacuity conditions for implies operator were suggested:

* If the antecedent is false, then (P1 implies P2) should be vacuous.

* Also, if the antecedent is vacuous, then (P1 implies P2) is vacuous.

* Also, if the antecedent is nonvacuous true, then (P1 implies P2) is nonvacuous if consequent is nonvacuous

My question is why the second condition has been added. If P1 is vacuously true, it does not mean that P1 implies P2 is vacuous.

2. Whatever the reply to my first question be, F.5.3.3 should be updated accordingly.

Thanks,
Dmitry
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