|  |  D.15.4.39 tdFactor Procedure from librarychern.lib(see  chern_lib).
 
Example: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
 | 
 
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