Sorry … I found nothing in boolTheory, but by guessing theorem names EQT_ELIM 
and EQF_ELIM are available...

> Il giorno 06 mag 2017, alle ore 23:17, Chun Tian (binghe) 
> <binghe.l...@gmail.com> ha scritto:
> 
> Hi,
> 
> We know that EQT_INTRO and EQF_INTRO can be used to convert an existing 
> theorem into equation with ``= T`` or ``= F`` at right hand side. For 
> instance:
> 
>> EQT_INTRO (REFL ``A``);
> val it = |- (A = A) ⇔ T: thm
> 
> But if I have a theorem returned by EQT_INTRO or EQF_INTRO, how can I go back 
> to the input theorem?
> 
> Regards,
> 
> Chun Tian
> 

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