Download e-book for iPad: Algebraic Varieties by Mario Baldassarri (auth.)

By Mario Baldassarri (auth.)

ISBN-10: 3642527612

ISBN-13: 9783642527616

ISBN-10: 3642527639

ISBN-13: 9783642527630

Algebraic geometry has constantly been an ec1ectic technological know-how, with its roots in algebra, function-theory and topology. except early resear­ ches, now a couple of century previous, this gorgeous department of arithmetic has for a few years been investigated mainly by means of the Italian university which, through its pioneer paintings, in line with algebro-geometric tools, has succeeded in build up an impressive physique of information. rather except its intrinsic curiosity, this possesses excessive heuristic price because it represents an important step in the direction of the trendy achievements. a definite loss of rigour within the c1assical equipment, specifically with reference to the principles, is basically justified through the artistic impulse published within the first levels of our topic; an identical phenomenon may be saw, to a better or much less quantity, within the historic improvement of the other technological know-how, mathematical or non-mathematical. at the least, in the c1assical area itself, the rules have been later explored and consolidated, mostly through SEVERI, on traces that have usually encouraged extra investigations within the summary box. approximately twenty-five years in the past B. L. VAN DER WAERDEN and, later, O. ZARISKI and A. WEIL, including their colleges, proven the equipment of contemporary summary algebraic geometry which, rejecting the c1assical limit to the complicated groundfield, gave up geometrical instinct and undertook arithmetisation below the starting to be impact of summary algebra.

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Extra resources for Algebraic Varieties

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Let us now suppose that the system L has some singular k-points outside the singular locus 01 V. We shall consider the system Las a single surface F* over k* = k(F), where F is a generic surface of Lover k. The theorem of BERTINI (in ZARISKI'S form) on singular points {see (IH, 7)} assures that the singular set 01 F* consists 01: 1. A subset arising Irom the singular locus 01 Vjk; 2. A subset arising Irom a subset 01 the base locus 01 L, which, excluding some singular point arising from a simple base curve of L, along which F has a variable singular point, consists entirely of singular points or curves arising Irom singular base sets 01 L 01 the same dimension.

We can now suppose that L possesses only simple isolated base k-points. The proof proceeds with a direct analysis by sequences of Q. T. acting on a single base k-point, with an application of the above process every time one of these gives new simple base k-curves, with the complication that such operations may again yield new base k-points. At any rate the finiteness of the whole process is assured: the theoretical bases are: the strict ascendancy 01 the local rings 01 the base k-point sequences and the lact that these points remain simple in every translormation.

12, Baldassarri 3 34 IH. Linear Systems For the latter theorem, in the abstract case, we begin {see ZARISKI [lOJ, p. 130} by taking k' = k(A), where the A'S are m + 1 indeterminates, algebraically independent over k(V): then k' = defV. Each subvariety Wjk of Vjk defines a subvariety Wjk', which is its extension to k' and has as generic point P over k' a generic point P of W with respect to k: the A'S are still algebraically independent over k(P) and, if this is true, the reasoning can also be inverted.

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Algebraic Varieties by Mario Baldassarri (auth.)

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