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D.15.4.39 tdFactor

Procedure from library chern.lib (see chern_lib).

Usage:
tdFactor(n, a); n integer, a polynomial

Return:
polynomial

Purpose:
computes up to degree n the Todd class
of the line bundle coresponding to the Chern root t

Note:
returns 0 if n is negative

Example:
 
LIB "chern.lib";
// the Todd class up do degree 4
ring r=0,(t), ls;
print( tdFactor(4, t) );
==> 1+1/2t+1/12t2-1/720t4