| #### D.5.2.14 chSum Procedure from library `chern.lib` (see chern_lib). Usage: chSum(c, C); c, C lists of polynomials Return: list of polynomials Purpose: computes the Chern classes of a direct sum of two vector bundles Note: Example:
    LIB "chern.lib";
    ring r = 0, (c(1..3), C(1..2)), dp;
    // Let E be a vector bundle with Chern classes c(1), c(2), c(3).
    // Let F be a vector bundle with Chern classes C(1), C(2).
    list l=c(1..3);
    list L=C(1..2);
    // Then the Chern classes of their direct sum are
    print( chSum(l, L) );

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