Download Algebraic geometry. A concise dictionary by Elena Rubei PDF

By Elena Rubei

ISBN-10: 3110316226

ISBN-13: 9783110316223

Algebraic geometry has a sophisticated, tricky language. This booklet incorporates a definition, a number of references and the statements of the most theorems (without proofs) for each of the commonest phrases during this topic. a few phrases of comparable matters are integrated. It is helping novices that be aware of a few, yet no longer all, uncomplicated proof of algebraic geometry to persist with seminars and to learn papers. The dictionary shape makes it effortless and speedy to refer to.

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Extra info for Algebraic geometry. A concise dictionary

Example text

Obviously the fibre ????−1 (????) is in bijection with the set of lateral classes of ???? in ????1 (????, ????): {????????| ???? ∈ ????1 (????, ????)}. In fact, if ???????????? ∈ ????−1 (????), we can send ???????????? to ????????, where ???? is the image through ???? of a path from ???????????? to ???????? . We have an action, called monodromy action, of ????1 (????, ????) on ????−1 (????): if ???? is a point of ̃ = ????; we define ???? ⋅ ???? to be ????−1 (????) and ???? ∈ ????1 (????, ????), let ????̃ be the lifting of ???? such that ????(0) ̃ ????(1). Observe that, if ???????????? is a point of ???????? such that ????(???????????? ) = ???? and ???? is the image through ???? of a path from ???????????? to ???????? , then ????∗ (????1 (???????? , ???????????? )) = ????−1 ????????.

More generally, if (????, ????) is a complete local Noetherian ring containing some field and ???? is its residue field, then ???? is isomorphic to ????[[????1 , . . , ???????? ]]/???? for some ???? and some ideal ????. In particular, if ???? is a smooth point of an algebraic variety ???? of dimension ???? over a field ????, then the completion of O????,???? is isomorphic to ????[[????1 , . . , ???????? ]]. See “Regular rings, smooth points, singular points”. Complexes. Let ???? be a ring. A complex of ????-modules, which is usually written ⋅⋅⋅ ????????−2 G ????????−1 ????????−1 G ???????? ???????? G ????????+1 ????????+1 G ⋅⋅⋅ , is the datum of a sequence of ????-modules ???????? and ????-homomorphisms ???????? : ???????? → ????????+1 such that ????????+1 ∘ ???????? = 0 for any ????.

Let ???? be a complex manifold and ???? be a holomorphic vector bundle with a Hermitian metric. There is a unique connection on ???? compatible both with the holomorphic structure and with the metric. Covering projections | 35 Correspondences. ([72], [93], [196]). Let ???? and ???? be two algebraic varieties; a correspondence from ???? to ???? is an algebraic cycle in ???? × ???? (see “Cycles”). Let ????, ????, ???? be three smooth algebraic varieties and let ????????,???? be the projection from ???? × ???? × ???? onto ???? × ???? and analogously ????????,???? and ????????,???? .

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