Download e-book for iPad: Algebraic combinatorics and coinvariant spaces by Francois Bergeron

By Francois Bergeron

ISBN-10: 1568813244

ISBN-13: 9781568813240

Written for graduate scholars in arithmetic or non-specialist mathematicians who desire to research the fundamentals approximately essentially the most vital present study within the box, this booklet presents a thorough, but available, advent to the topic of algebraic combinatorics. After recalling easy notions of combinatorics, illustration concept, and a few commutative algebra, the most fabric offers hyperlinks among the research of coinvariant or diagonally coinvariant areas and the learn of Macdonald polynomials and comparable operators. this offers upward push to quite a few combinatorial questions on the subject of items counted through usual numbers reminiscent of the factorials, Catalan numbers, and the variety of Cayley bushes or parking features. the writer deals principles for extending the speculation to different households of finite Coxeter teams, along with permutation teams.

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We write mλ = mλ (x) for the sum of all the different monomials xa for which a = λ. In other words, the sum is over all the monomials xa with a varying in the set of rearrangements of the length n vector (λ1 , . . , λk , 0, . . , 0). This makes it clear that a given monomial appears with multiplicity one in mλ , as illustrated by the fact that m211 (x1 , x2 , x3 ) = x21 x2 x3 + x1 x22 x3 + x1 x2 x23 contains three terms rather than six. Observe that our definition forces mλ = 0 when (λ) > n. The linear independence of the mλ , for λ varying in the set of partitions of d with length at most n, follows by an obvious triangularity argument from that of the monomials xλ = xλ1 1 xλ2 2 · · · xλk k .

22. Lexicographic order for n = 6. 8 Compositions A composition c = (c1 , c2 , . . , ck ) of an integer n is an ordered sequence of parts ci > 0 (in N) that sum up to n. We write c |= n when n is a composition of n. The length (c) of a composition c is the number of its parts. We can readily check that there are 2n−1 compositions of n, by constructing a bijective correspondence between composition of n and subsets of {1, 2, . . , n − 1}. To do this, we associate with the composition c = (c1 , c2 , .

For example, starting with an “ordinary” word u = a1 a2 · · · an we can consider the canonical lexicographic biletter word 1 a1 ··· ··· 2 a2 n an to which the RSK correspondence is applied to get the pair of tableaux (P, Q). Since the top line of the input word is (1, 2, . . , n), it follows that the tableau Q is actually standard. In the even more special case when a1 a2 · · · an is a permutation of {1, 2, . . , n}, the tableau P is also standard. This establishes a bijection between permutations in SN and pairs of standard tableaux of the same shape.

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Algebraic combinatorics and coinvariant spaces by Francois Bergeron


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