D.5.3.1 tau_es

Procedure from library equising.lib (see equising_lib).

Usage:

tau_es(f); f poly

Assume:

f is a reduced bivariate polynomial, the basering has precisely two variables, is local and no qring.

Return:

int, the codimension of the mu-const stratum in the semi-universal deformation base.

Note:

printlevel>=1 displays additional information.
When called with any additional parameter, the computation of the Milnor number is avoided (no check for NND).

Example:

LIB "equising.lib";
ring r=32003,(x,y),ds;
poly f=(x4-y4)^2-x10;
tau_es(f);
→ 42

See also: esIdeal; invariants; tjurina.