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We show that the big quantum cohomology of the symplectic isotropicGrassmanian $IG(2,6)$ is generically semisimple, whereas its small quantumcohomology is known to be non-semisimple. This gives yet another case whereDubrovin's conjecture holds and stresses the need to consider the big quantumcohomology in its formulation.

Dubrovin's conjecture for $IG(2,6)$