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D.5.2.39 tdFactor
Procedure from librarychern.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 corresponding to the Chern root t - Note:
- returns 0 if n is negative
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 |