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98% of people can't solve this % * + =3 O - % - =0 = z y| =^/#w ^ = Pn(R) H>'l%,','^) has a ring structure fceN ":•(-, Z?) : C -? Set is contravariant ^(-4. Z?) = {(p : A —> i3|<p is a morphism} given that is the derived functor of *;• and sequence 0 —t i(C-y(H,; —> H';w) —t —+ 0. is exact describe in terms of polynomal ring over ^
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