| #### D.5.2.39 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 corresponding 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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