[GiNaC-list] using modulo and expanding

[Kostas Patsakis]

is there a way to use modulo over an expression?
for example:
3*k1^2+4*k1*k2+1231231*k1 mod 2=
k1^2+k1

all I really want is to work with polynomials over Z_2
so with subs I can do subs(a,$1^2=$1)
but some times it's not enough cause I might run into something with power
more than 2 would subs(a,$1^$2=$1) be enough???
I'm not using ginsh but c++
any help???
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