Takafumi Kouno, Satoshi Naito
We prove an explicit inverse Chevalley formula in the equivariant K-theory of semi-infinite flag manifolds of simply-laced type. By an inverse Chevalley formula, we mean a formula for the product of an equivariant scalar with a Schubert class, expressed as a Z[q±1]-linear combination of Schubert classes twisted by equivariant line bundles. Our formula applies to arbitrary Schubert classes in semi-infinite flag manifolds of simply-laced type and equivariant scalars eλ, where λ is an arbitrary minuscule weight. By a result of Stembridge, our formula completely determines the inverse Chevalley formula for arbitrary weights in simply-laced type, except for type E8. The combinatorics of our formula is governed by the quantum Bruhat graph, and the proof is based on a limit from the double affine Hecke algebra. As such, our formula also provides an explicit determination of all nonsymmetric q-Toda operators for minuscule weights in ADE type.
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title={Inverse K Chevalley formulas for semi in (1)},
author={Takafumi Kouno and Satoshi Naito},
year={2026},
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