f(x) = 1/x;
g(N) = for(i = -N, N, f(i));
g(10)
print();

f=matsolve;
f(Mat(0), Col(0))
print();

(matsolve)(Mat(0), Col(0))
print();

a.foo=1/(1+a^2);
g(x)=[x.foo];
g(I)
print();

(x->1/x)(0)
print();

