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By A. Rosenberg

This publication is predicated on lectures added at Harvard within the Spring of 1991 and on the collage of Utah throughout the educational 12 months 1992-93. officially, the e-book assumes simply normal algebraic wisdom (rings, modules, teams, Lie algebras, functors etc.). it truly is worthwhile, notwithstanding, to understand a few fundamentals of algebraic geometry and illustration thought. every one bankruptcy starts off with its personal advent, and so much sections also have a brief assessment. the aim of what follows is to provide an explanation for the spirit of the booklet and the way diversified components are associated jointly with out getting into information. the purpose of departure is the thought of the left spectrum of an associative ring, and the 1st normal steps of basic thought of noncommutative affine, quasi-affine, and projective schemes. This fabric is gifted in bankruptcy I. extra advancements originated from the necessities of numerous vital examples i attempted to appreciate, to start with the 1st Weyl algebra and the quantum airplane. The ebook displays those advancements as I labored them out in reallife and in my lectures. In bankruptcy eleven, we research the left spectrum and irreducible representations of a complete lot of jewelry that are of curiosity for contemporary mathematical physics. The dasses of earrings we reflect on indude as particular situations: quantum airplane, algebra of q-differential operators, (quantum) Heisenberg and Weyl algebras, (quantum) enveloping algebra ofthe Lie algebra sl(2) , coordinate algebra of the quantum staff SL(2), the twisted SL(2) of Woronowicz, so referred to as dispin algebra and plenty of others.

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Extra resources for Noncommutative Algebraic Geometry and Representations of Quantized Algebras

Example text

5). Then any open subscheme of (X, 0) is given by (U, Qx : O(U) n --+ Ox Ix EU), where U is an open subset of X and O(U) is the quotient category O(X)j(U), (U) KerQx. xEU If O(X) ~ R - mod, then (U) is the full subcategory of R - mod generated by all modules with support contained in the closed subset X - U. 2. Left projective spectrum. We begin with some generalities on the graded left spectrum. 1. Graded spectral theory. Let H be a commutative semigroup; and let R be an H-graded ring. Denote by gtHSpeqR the subset of SpeqR formed by H-graded ideals.

In Here n:= mF',x. Since j is a monomorphism and gx is an epimorphism, there exists an arrow >. from n = mF',xX to M such that j 0 >. ~ In(b) 1/ the left ideals n, n' belong to C( 0, then their sum, n + n', also belongs to C( O. ~ In and { In' are of the form j 0 >. and j 0 >" for some uniquely determined morphisms >. and >" respectively. ~ In+n' ~ n+n' Since 'P is an epimorphism and j is a monomorphism, there exists a unique R-module morphism h: n + n' ~ M such that ~ In+n'= j 0 h. (c) Finally, together with every ascending family W of ideals, the set C(e) contains the sum of all the ideals from W.

Thus, u'" is a homeomorphism. (f) It is easy to check that, for any localizing filter F of the left ideals of the ring R, which contains the ideal a, the set F", := {m n alm E F} is a localizing filter of left ideals of a. Since F", is a cofinal subset of F, the F-torsion FM:= {z E M I mz = {O} for some m E F} of an arbitrary R-module M coincides with its F",-torsion. Besides, HomR(M',M") = Hom",(M',M") provided the {a }-torsion of the module M" is zero. Therefore we have (cf. 3): Gp(M) = colim{HomR(m,M/FM) Im E F} = colim{Hom",(m',M/F",M) Im' E F",} = GFQ(M).

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