By Torsten Ekedahl

Those lecture notes grew out of a one semester introductory path on elliptic curves given to an viewers of desktop technology and arithmetic scholars, and suppose in basic terms minimum history wisdom. After having coated simple analytic and algebraic facets, placing detailed emphasis on explaining the interaction among algebraic and analytic formulation, they cross directly to a few extra really good themes. those comprise the \$j\$-function from an algebraic and analytic standpoint, a dialogue of elliptic curves over finite fields, derivation of recursion formulation for the department polynomials, the algebraic constitution of the torsion issues of an elliptic curve, advanced multiplication, and modular kinds. so that it will inspire easy difficulties the ebook begins very slowly yet considers a few facets corresponding to modular kinds of larger point which aren't frequently handled. It offers greater than a hundred workouts and a Mathematica TM workstation that treats a couple of calculations concerning elliptic curves. The publication is geared toward scholars of arithmetic with a common curiosity in elliptic curves but additionally at scholars of computing device technology drawn to their cryptographic facets. A e-book of the eu Mathematical Society (EMS). dispensed in the Americas by means of the yank Mathematical Society.

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Additional info for One semester of elliptic curves

Example text

We shall now analyse this a little bit more carefully to obtain explicit forms for the constants a, b, and c. We start by expanding ℘ (z) in a Taylor series around the origin. 4. 5 Proof. We write the summands of the non-polar part as 1 1 1 − 2 = 2 2 (z − γ ) γ γ ∞ = n=1 for every 0 = γ ∈ gives 1 1 −1 = 2 2 (1 − z/γ ) γ 1+ z z2 + 2 + ··· γ γ 2 −1 (n + 1)zn γ n+2 . Summing over all such γ and exchanging summation signs ℘ (z|ω1 , ω2 ) = 1 + z2 ∞ (2n − 1)Gn (ω1 , ω2 )z2n−2 , n=2 as the odd degree parts sum up to zero because γ → −γ leaves the sum invariant.

We may embed the ordinary, or affine, plane, K 2 , in the projective plane by (x, y) → (x : y : 1). The image consists exactly of the homogeneous coordinates (x : y : z) for which z = 0 and then (x : y : z) = (x/z : y/z : 1) so that (x : y : z) → (x/z, y/z) is the inverse map. Over the reals this embedding can be easily (and nicely) envisaged. One considers the plane z = 1 which is parallel to the xy-plane. Then every line through the origin that does not lie in the xy-plane meets this plane at a unique point (cf.

Ii) Show that if the two fundamental periods of dx/y are linearly dependent over the reals, then there is a 0 = λ ∈ C such that (λ dx/y) gives a well-defined function on X. Show that it is harmonic and conclude that it is constant and get a contradiction from this. 40 3 Elliptic functions Exercise 29. Show that the map X → C/ it is an isomorphism. is a covering map and then conclude that 4 A projective interlude Our aim now is to see how much of what we have proven with analytic methods makes algebraic sense (and can be proven algebraically).