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... / песочница
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