KASH3 Ref - HasPreimage

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| ### Function HasPreimage ( any x, map() f ) -> elt-alg^boo, any ### Optional Arguments
Results | elt-ord^rat |  | 1 <= Results <= 2
### Description True and the preimage of x under f iff it exists, false otherwise. ### Examples x_G:=AbelianGroup([2,3]);x_H:=AbelianGroup(x_G); HasPreimage(x_G.1,x_H.ext1);
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