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D.15.2.39 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
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