# multiplicative formal group law

Euler’s addition formula for a certain elliptic integral, X p 1 Y4 +Y p 1 X4 1 X2Y2 2 Z[1=2][[X;Y]]: Quillen’s work on formal group laws and complex cobordism theory Doug Ravenel Quillen’s 6 page paper Enter the formal group law Show it is universal The Brown-Peterson K-theory spectrum; Last revised on June 6, 2017 at 08:08:18. If you’re willing to look at non-algebraically-closed bases, then even $\mathbf G_{\text m}$, the multiplicative formal group, doesn’t show up in the formal group of an Abelian variety over $\Bbb F_p$. characteristic zero, the additive and multiplicative formal groups are not isomorphic. (d) F(x;y) = (x p 1 y4 + y 1 x4)=(1 + x2y2), a formal group law over Z[1=2]. (c) F(x;y) = (x+y)=(1+xy). The additive formal group law G^ a is simply X+Y, while the multiplicative formal group law G^ m is X+ Y + XY. Note that for any commutative formal group law, the corresponding Lie algebra is an abelian Lie algebra. $\endgroup$ – Lubin Jan 10 '18 at 20:56 A less trivial example is the construction of the group law associated to an elliptic curve, which will be given in §4. To prove this, we need an invariant which can be used to tell two formal groups apart. (b) F(x;y) = x + y + uxy (where u is a unit in R), the multiplicative formal group law, so named because 1+ uF = (1+ux)(1+uy). Other formal group laws … In fact, all formal group laws are commutative as long as Ahas no elements that are both nilpotent and torsion. Let F;Gbe formal group laws over a ring A. Related concepts. De nition 5. In this sense, taking the Lie algebra forgets much of the structure. However, we will simply assume that a \formal group law" is commutative (and one-dimensional) from now on. ditive formal group law. The formal group law of topological K-theory which is induced by its canonical complex orientation is the multiplicative formal group law. With formal group laws de ned, we should now discuss maps between them. First, we need a brief digression concerning endomorphisms of a formal group law. De nition 1.4. In particular, the Lie algebra cannot distinguish between the additive formal group law, multiplicative formal group law, and elliptic curve group … (This expression is (1 + X)(1 + Y) 1, and therefore represents multiplication for a parameter centered around 0 rather than 1.) See at topological K-theory the section Complex orientation and Formal group law. (And in fact, -theory—the natural candidate for this—is not real-oriented, only spin-oriented.) With this in mind, the analog of Quillen’s theorem for becomes: Theorem 1 (Quillen) The formal group law for is the universal formal group law over a satisfying . This is not satisfied by, say, the multiplicative formal group law. The formal group law of an elliptic curve has seen recent applications to computational algebraic geometry in the work of Cou- ... Y+ XY (called the multiplicative group law). X +Y +XY, the multiplicative formal group law.

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