By Robert G. Underwood

The research of Hopf algebras spans many fields in arithmetic together with topology, algebraic geometry, algebraic quantity idea, Galois module concept, cohomology of teams, and formal teams and has wide-ranging connections to fields from theoretical physics to computing device technological know-how. this article is exclusive in making this attractive topic available to complex graduate and starting graduate scholars and specializes in functions of Hopf algebras to algebraic quantity idea and Galois module idea, offering a soft transition from smooth algebra to Hopf algebras.

After delivering an advent to the spectrum of a hoop and the Zariski topology, the textual content treats presheaves, sheaves, and representable workforce functors. during this method the scholar transitions easily from uncomplicated algebraic geometry to Hopf algebras. the significance of Hopf orders is underscored with purposes to algebraic quantity idea, Galois module conception and the speculation of formal teams. by means of the top of the ebook, readers should be conversant in verified ends up in the sphere and able to pose study questions in their own.

An workout set is incorporated in each one of twelve chapters with questions ranging in trouble. Open difficulties and examine questions are offered within the final bankruptcy. must haves comprise an figuring out of the cloth on teams, jewelry, and fields typically coated in a uncomplicated path in sleek algebra.

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**Extra info for An Introduction to Hopf Algebras**

**Example text**

R; W A ! 4), respectively. S / is a group under the binary operation . Proof. S / to be a group. 5 is a representable group functor, which is also called an affine group scheme or an R-group scheme. The R-algebra A is the representing algebra of F ; we write RŒF D A. Note that F is a functor from the category of commutative R-algebras to the category of groups, where the morphisms are homomorphisms of groups. The map is the comultiplication map of A, is the counit map of A, and is the coinverse map of A.

A ˝ b/ D a ˝ b. 1 to the ideal B B ˝R B. C C D ˇ, and thus ˇ is an isomorphism. 2. Let B C denote the augmentation ideal of B. B C / Â B˝R B C C B C ˝R B. Proof. Let R W R ! R; /, and let . ˝ / W B ˝R B ! R ˝R R be the R-algebra map defined by a ˝ b ! b/ for a; b 2 B. For all b 2 B, . b/ D . b/ D . b/ D . b/ ˝ 1 D R . b//: Thus, for b 2 B C , . b/ D R . B C / Â ker. 1 there is an R-algebra isomorphism ˛ W B=B C ˝R B=B C ! 8) 46 3 Representable Group Functors which yields a surjective homomorphism of R-algebras ˇ W B ˝R B !

T / commutes. S / # ! a a S ! T / T W G ! F is a natural transformation. t u And, with a little more work, one can prove the following. 4. A; / be representable functors from the category of commutative R-algebras to the category of sets. Then the collection of R-algebra homomorphisms A ! B is in a 1-1 correspondence with the collection of natural transformations G ! F . Proof. We show that 7! A; B/ and the collection of natural transformations G ! F . Let W A ! B be an R-algebra homomorphism. 3, a is a natural transformation.