don't understand inverseimage

[<rcasero@tsc.uc3m.es>]

Hi everybody. I'm new to pari, and I cannot understad the description of
the [mat]inverseimage(x, y) function. I suppose it's quite clear for
everybody else, but maybe it's that I'm also quite new to number theory.
I've searched for more information with Google, but I couldn't find
anything beside that.

I've been doing some tests with pg and octave, and it seems that if x =
A, y = y, it does something similar to

z = A^(-1) * y

But then , why z `belongs to the inverse image of y' and not `z is the
inverse image of y'?

Regards,

Ramón.

-- 
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                Ramón Casero Cañas
                rcasero@tsc.uc3m.es

              Ing. de Telecomunicación.
          Universidad Carlos III de Madrid
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