arXiv subjects

Kazuto Iijima

Publications and source records attributed to Kazuto Iijima.

5 recordsLinked to original sources

arXiv2014

Representation type of finite quiver Hecke algebras of type $A^{(1)}_{\ell}$ for arbitrary parameters

We give Erdmann-Nakano type theorem for the finite quiver Hecke algebras $R^{Λ_0}(β)$ of affine type $A^{(1)}_{\ell}$. Note that each finite quiver Hecke algebra lies in one parameter family, and the original Erdmann-Nakano theorem studied the finite quiver Hecke algebra at a special parameter value. We study the general case in our paper. Our result shows in particular that their representation type does not depend on the parameter. Moreover, when the parameter value is nonzero, we show that finite quiver Hecke algebras of tame representation type are biserial algebras.

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arXiv2012

On a higher level extension of Leclerc-Thibon product theorem in q-deformed Fock spaces

The q-deformed Fock spaces of higher levels were introduced by Jimbo-Misra-Miwa-Okado. Uglov defined a canonical bases in q-deformed Fock spaces of higher levels. Leclerc-Thibon showed a product theorem in q-deformed Fock spaces of level one. The product theorem is regarded as a formal $q$-analogue of the tensor product theorem of level one. In this paper, we show a higher level analogue of Leclerc-Thibon product theorem under a suitable multi charge condition.

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arXiv2011

The first term of plethysms

Plethysm of two Schur functions can be expressed as a linear combination of Schur functions, and monomial symmetric functions. In this paper, we express the coefficients combinatorially in the case of monomial symmetric functions. And by using it, we determine the first term of the plethysm with respect to Schur functions under the reverse lexicographic order.

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arXiv2011

A $q$-multinomial expansion of LLT coefficients and plethysm multiplicities

Lascoux, Leclerc and Thibon\cite{LLT} introduced a family of symmetric polynomials, called LLT polynomials. We prove a $q$-multinomial expansion of the coefficients of LLT polynomials in the case where $ \boldsymbolμ = \underbrace{(μ,...,μ)}_{n}$ and define a $q$-analog of a sum of the plethysm multiplicities.

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arXiv2011

A comparison of q-decomposition numbers in the q-deformed Fock spaces of higher levels

The q-deformed Fock spaces of higher levels were introduced by Jimbo-Misra-Miwa-Okado. The q-decomposition matrix is a transition matrix from the standard basis to the canonical basis defined by Uglov in the q-deformed Fock space. In this paper, we show that parts of q-decomposition matrices of level $\ell$ coincides with that of level $\ell - 1$ under certain conditions of multi charge.

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