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Extended affine Weyl groups and Frobenius manifolds

Published online by Cambridge University Press:  04 December 2007

SISSA, Via Beirut 2–4, 34014 Trieste, Italy, and Steklov Mathematics Institute, Moscow, e-mail:
Youjin ZHANG
SISSA, Via Beirut 2–4, 34014 Trieste, Italy, and Department of Mathematics, University of Science and Technology of China, Hefei, e-mail:
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We define certain extensions of affine Weyl groups (distinct from these considered by K. Saito [S1] in the theory of extended affine root systems), prove an analogue of Chevalley Theorem for their invariants, and construct a Frobenius structure on their orbit spaces. This produces solutions $F(t_1, …, t_n)$ of WDVV equations of associativity polynomial in $t_1, …, t_n-1$, exp $t_n$.

Research Article
© 1998 Kluwer Academic Publishers