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 KASH3 Reference Manual
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Function

HasPreimage ( any x, map() f ) -> elt-alg^boo, any

Optional Arguments

Resultselt-ord^rat1 <= 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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