By H. H. Schaefer

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**Extra resources for Banach Lattices and Positive Operators**

**Sample text**

Such a subobject W to be a sieve of U ∈ Ob(C ). For V ∈ Ob(C ) we have U V = HomC (V, U ) ˆ → U , we have the and for a monomorphism representing the subobject i : W ˆ ˆ of U set-theoretic inclusion iV : W V → U V . Namely, to give a sieve W ˆ V of HomC (V, U ) for every V ∈ Ob(C ). By the is to determine a subset W ˆ ). 1) in Cˆ V where i ◦ φ = iV (φ ) = φ. A pair (C , J(C )) is said to be a site, where J(C ) = {J(U ) | U ∈ Ob(C )} if each set J(U ) of sieves for U satisfies the following conditions.

Namely, F φ is a monomorphism, ker F ψ = im F φ and F ψ is an epimorphism in B. , F ψ need not be an epimorphism, F is said to be a left exact functor. Similarly, when FA Fφ G FA Fψ G FA G0 is exact in B, F is said to be a right exact functor. 3)), F is said to be half-exact. 5 Injective Objects [Injective Objects] Let A be an abelian category. 6). Then the contravariant functor HomA (·, A) is a left exact functor from A to Ab. 2) where, for instance, φ∗ := HomA (φ, A). 3) G 0. An injective object I in A is an object to guarantee the exactness of the functor HomA (·, I) : A Ab.

A Next we will show that there is a monomorphism : A → I 0 . 4)). Let = ◦ ψ : A → I 0 . 2). 54 Derived Functors Next consider the following diagram. 3). We define d0 , d0 and d0 as the compositions I 0 → I 0 im → I 1 , I 0 → I 0 im → I 1 and I 0 → I 0 im → I 1 , respectively. 5) which are injective resolutions of A , A and A , respectively. Therefore, we obtain the exact sequence of complexes 0 • • G F I• F ι G F I• F π G F I• G 0. 7) j ∂ G G ... 1)). F 0y dj−1 G F y Ij F djG F Iy j+1 F πj ...