D.5.5.11 intersection
.....................
Procedure from library hnoether.lib (see hnoether_lib).

Usage:
intersection(hne1,hne2); hne1, hne2 lists

Assume:
hne1, hne2 represent a HNE (i.e., are the output of
develop(f), or of extdevelop(develop(f),n), or
one entry of the list hne in the ring created by
hnexpansion(f[,"ess"])).

Return:
int, the intersection multiplicity of the branches corresponding to
hne1 and hne2.

Example:
LIB "hnoether.lib";
// ------ the example starts here -------
ring r=0,(x,y),dp;
list hn=hnexpansion((x2-y3)*(x2+y3));
def HNEring=hn[1];
setring HNEring;
intersection(hne[1],hne[2]);
==> 6
See also:
displayInvariants;
hnexpansion.


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