| #### D.5.2.15 ChernRootsDual Procedure from library `chern.lib` (see chern_lib). Usage: ChernRootsDual(l); l a list of polynomials Return: list of polynomials Purpose: computes the Chern roots of the dual vector bundle of a vector bundle with Chern roots from l Note: Example:
    LIB "chern.lib";
    ring r = 0, (a(1..3)), dp;
    // assume a(1), a(2), a(3) are the Chern roots of a vector bundle
    list l=a(1..3);
    // the Chern roots of the dual vector bundle
    print( ChernRootsDual(l) );
    ==> [1]:
    ==>    -a(1)
    ==> [2]:
    ==>    -a(2)
    ==> [3]:
    ==>    -a(3)

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