Algebra II: Textbook for Students of Mathematics by Alexey L. Gorodentsev

By Alexey L. Gorodentsev

This publication is the second one quantity of a radical “Russian-style” two-year undergraduate path in summary algebra, and introduces readers to the fundamental algebraic buildings – fields, earrings, modules, algebras, teams, and different types – and explains the most rules of and techniques for operating with them.

The direction covers huge parts of complicated combinatorics, geometry, linear and multilinear algebra, illustration conception, class idea, commutative algebra, Galois idea, and algebraic geometry – themes which are frequently neglected in general undergraduate courses.

This textbook relies on classes the writer has carried out on the self sufficient collage of Moscow and on the school of arithmetic within the better tuition of Economics. the most content material is complemented by means of a wealth of workouts for sophistication dialogue, a few of which come with reviews and tricks, in addition to difficulties for self sufficient study.

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40) divided by nŠ. V/. 40). t u the d d 1 12 13 Here we use that ???? is algebraically closed. See Sect. 3 of Algebra I. 41) is called the Veronese variety. 19 (Veronese Embedding) Verify that the prescription ' 7! V / ,! 41). 5 on p. 34 that for every Grassmannian polynomial ! 2 ƒn V over a field of characteristic zero, there exists a unique alternating tensor e ! 2 Altn V V ˝n mapped to ! under the factorization by the skewcommutativity relations sk W V ˝n ƒn V . WV V V ! ????; e ! i; called the complete polarization of the Grassmannian polynomial !

W; u/ for all u; w 2 V. Recall that a correlation on a vector space W is a linear map b ˇ W W ! W . The correlations ˛ ˝ ˇ w (see Sect. 1 of are in bijection with the bilinear forms ˇ W W W ! u; w/ D u; b Algebra I). 7 That is, independent of any extra data on U and W, such as the choice of bases. u; w; w/. 1 Free Associative Algebra of a Vector Space Let V be a vector space over an arbitrary field ????. We write V ˝n ≝ V ˝ V ˝ ˝V for the tensor product of n copies of V and call it the nth tensor power of V.

5 (Universal Property of Free Commutative Algebras) Show that for every commutative ????-algebra A and linear map f W V ! A, there exists a unique homomorphism of ????-algebras e f W SV ! A such that f D e ' ∘ Ã. Also show that for every linear map Ã0 W V ! S0 to a commutative algebra S0 that possesses the same universal property, there exists a unique isomorphism of algebras W S0 ⥲ SV such that Ã0 D Ã. For this reason, the symmetric algebra SV is also called the free commutative ????commutative algebra with unit spanned by V.

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