By Joseph H. Silverman
The speculation of elliptic curves is wonderful by way of its lengthy heritage and by way of the range of the tools which were utilized in its examine. This ebook treats the mathematics technique in its glossy formula, by utilizing uncomplicated algebraic quantity concept and algebraic geometry. Following a short dialogue of the required algebro-geometric effects, the ebook proceeds with an exposition of the geometry and the formal staff of elliptic curves, elliptic curves over finite fields, the complicated numbers, neighborhood fields, and worldwide fields. ultimate chapters care for essential and rational issues, together with Siegels theorem and specific computations for the curve Y = X + DX, whereas 3 appendices finish the total: Elliptic Curves in features 2 and three, crew Cohomology, and an summary of extra complicated subject matters.
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Extra info for The Arithmetic of Elliptic Curves
Dfldt (cf. 3). ) Assuming that char(K) =I 2, the function (-2f + tf')/(2g + altf + a3t3) is regular and non-vanishing at 0; and so ordo(w) = O. If char(K) = 2, then the same result follows from a similar calculation (using w = dy/Fx(x, y)) which we will leave for the reader. D Next we look at what happens when a Weierstrass equation is singular. 6. If a curve E given by a Weierstrass equation is singular, then there exists a rational map ,p: E -+ pl of degree 1. e. E is birational to pl. ) PROOF.
A divisor DE Div( C) is principal if it has the form D = div(f) for some f E K(C)*. Two divisors D1 , D2 are linearly equivalent, denoted Dl '" D2 , if Dl - D2 is principal. The divisor class group (or Picard group) of C, denoted Pic( C), is the quotient of Div( C) by the subgroup of principal divisors. We let PicK(C) be the subgroup of Pic(C) fixed by GK/K. B. In general, PicK (C) is not the quotient of DivK( C) by its subgroup of principal divisors. But see (exer. 1. Let C be a smooth curve and f (a) div(f) = 0 if and only if f (b) deg(div(f) = O.
5. Let us show that there are no holomorphic differentials on pl. First, if t is a coordinate function on p 1, then div(dt) = - 2( 00). ) Thus dt is not holomorphic. 3a) implies that deg div(co) = deg div(dt) = -2, so co cannot be holomorphic either. 6. 3). ) We thus see that div(dx/y) = O. Hence dx/y is both holomorphic and non-vanishing. §5. The Riemann-Roch Theorem Let C be a curve. We put a partial order on Div(C) as follows. Definition. A divisor D = ~np(P) E Div( C) is D~O, positive (or effective), denoted by 38 II.