FUNCTION: eulf

CALLING SEQUENCE:
eulf(f₁,f₂)

PARAMETERS:
f₁, f₂ - two classes of type quiver

SYNOPSIS:

• Computes the euler-characteristic for any pair of K₀ X -classes of type quiver.

EXAMPLES:

> with(tubular):

> read_in(3,3,3);

> f1 := get_class([4/3,3,0,2]); f2 := get_class([4/3,3,1,7]);

> show(f1); show(f2);

> eulf(f1,f2);

> eulf(f2,f1);