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Invariant number triangles, eigentriangles and Somos-4 sequences
Invariant number triangles eigentriangles Somos-4 sequences Combinatorics
2011/9/22
Abstract: Using the language of Riordan arrays, we look at two related iterative processes on matrices and determine which matrices are invariant under these processes. In a special case, the invarian...
Co-quasi-invariant spaces for finite reflexion groups
Low degree components Colored quasi-symmetric polynomials
2011/8/24
安徽理工大学共建数据
Abstract: We study, in a global uniform manner, the quotient of the ring of polynomials in l sets of n variables, by the ideal generated by diagonal quasi-invariant polynomials for general permutation...
Factor frequencies in languages invariant under more symmetries
Factor frequencies languages invariant Combinatorics
2011/8/24
Abstract: The number of frequencies of factors of length $n+1$ in a recurrent aperiodic infinite word does not exceed $3\Delta \C(n)$, where $\Delta \C (n)$ is the first difference of factor complexit...