RE: [sv-ac] Comment regarding LTL - Mantis 1932

From: Bustan, Doron <doron.bustan_at_.....>
Date: Mon Jan 28 2008 - 11:52:12 PST
Hi Ed,

>>Regarding the leading clock in until. My point is that the rule deals
with
>>the case when some clock v flows in P1 until P2. But what if there is
no
>>clock flowing in? E.g. Assert property (P1 until P2);
>>Does the leading clock of P1 have to be the same as in P2? (I hope
so.)
>>

[[DB:]] Since the leading clock of until is inherited, there must be a
clock flowing from the left into the until property; so unless there is
an inferred clock, the assertion "assert property (P1 until P2);" is
illegal.

The rule in item c) says "- Every explicit semantic leading clock of P1
or P2 is identical to c."  I think this match your intuition


>>In the formal part, vacuity, in the case of P1 or P2, it seems to me
that
>>if P1 has vacuous success and P2 is non-vacuous failure, it would be
>>declared as non-vacuous success. That looks strange. Or did I miss
>>something?
>>
[[DB:]] I think you are right, and this is bothering. However, it is not
part of 1932. We tried to give a conservative definition (no false
negatives) and keep the definition indifferent to negation. I think that
sometime in the future we will have to find a better definition.

Thanks 

Doron


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Received on Mon Jan 28 13:13:19 2008

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