[isabelle] strong and weak premises


in the Isar 2016 slides, strong and weak premises are shown:

strong premises: have B if A1 and A2

weak premises: have B when A1 and A2

but they are not explained in details.

What does

   show A1 ==> A2 ... ==> B becomes free for re-interpretation
   so these are strong premises


- Gergely

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