beilinsonContraction(e, rowdeg, coldeg)
Returns a map between two Beilinson generators (i.e. the beilinson generators beilinsonBundle(a, E) of the derived category). Note:
(1) (S,E) is the result of productOfProjectiveSpaces
(2) e is a homogeneous element of E giving a map from E(-coldeg) --> E(-rowdeg).
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E is positively graded, in contrast to the paper!
The object beilinsonContraction is a method function with options.