[isabelle] Basic question about apply-style reasoning

Hi all,

I have a goal of the form:
 I a b ==> I a' b'

how to transform this goal into
   a=a' &&& b=b'
which can (in my case) be easily solved by auto.
Optimal would be a proof like this:
   by (auto {intro,elim,dest,simp}: some_rule)

I tried to find an adequate rule via find_thms, but had no success.


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