Littlewood-Richardson coefficients and Kazhdan-Lusztig polynomials

  title={Littlewood-Richardson coefficients and Kazhdan-Lusztig polynomials},
  author={Bernard and Jean-Yves},
We show that the Littlewood-Richardson coefficients are values at 1 of certain parabolic Kazhdan-Lusztig polynomials for affine symmetric groups. These q-analogues of Littlewood-Richardson multiplicities coincide with those previously introduced in [21] in terms of ribbon tableaux. 
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