Singular Manual: chProdE

| #### D.5.2.19 chProdE Procedure from library `chern.lib` (see chern_lib). Usage: chProdE(c, C); c, C lists of polynomials Return: list of polynomials Purpose: computes the list of Chern classes of the product of two vector bundles in terms of their Chern clases Note: makes sense only for (lists of) polynomials; uses elimination, hence very inefficient; included only for comparison with chProd(...) Example:
    LIB "chern.lib";
    ring H = 0, ( c(1..3), C(1..2) ), dp;
    list l=c(1..3);
    list L=C(1..2);
    // the Chern classes of the tensor product of a vector bundle E of rank 3
    // with Chern classes c(1), c(2), c(3)
    // and a vector bundle F of rank 2 with Chern classes C(1) and C(2):
    print( chProdE(l,  L) );

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