[Agda] neg ~~

[Serge D. Mechveliani]

People,
I define                      x \~~n y  =  \neg (x \~~ y)
for negation of equivalence

(the attachement              t.agda.zip  
writes this in math symbols).  

But may be Standard library has a similar definition
(similar as for \equiv) ?

Thanks,

------
Sergei
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