| #### D.5.2.16 chDual Procedure from library `chern.lib` (see chern_lib). Usage: chDual(c); c list of polynomials Return: list of polynomials Purpose: computes the list of Chern classes of the dual vector bundle Note: Example:
    LIB "chern.lib";
    // Chern classes of a vector bundle that is dual to a vector bundle
    // with Chern classes c(1), c(2), c(3)
    ring r=0, (c(1..3)), dp;
    list l=c(1..3);
    print(chDual(l));
    ==> [1]:
    ==>    -c(1)
    ==> [2]:
    ==>    c(2)
    ==> [3]:
    ==>    -c(3)

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