我讀 Hartshorne 的 Algebraic Geometry
作到 P.68 1.19 的(b)
Let X be a topological space, let Z be a closed subset, U = X-Z
j : U → X be its inclusion.
(b) F be a sheaf on U. ( j_!(F) )_p is equal to F_p if p ∈ U,
0 if p is not belongs to U.
後面要證明 j_!(F) is the only sheaf on X which has this property.
唯一性這裡，我想到假設有另一個sheaf滿足這個性質，想證明它們是isomorphism
可是我定不出morphism，我覺得我根本想錯證法。
直覺上是對的，但這個要怎麼看？？~~
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