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Old 4th February 2018, 05:40 AM   #1
sphenisc
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Rule of logic

Is there any name for the rule of logic:

If a then b
If not a then b
Therefore b

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Old 4th February 2018, 06:31 AM   #2
ddt
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Disjunction elimination or case analysis.

No fancy Latin name though.

It's not an exact match with what you ask, for the exact match you'd have to introduce the predicate
A or not A
and also prove it's true. Which is not the case in intuitionistic logic, but is in classical logic.
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