  Topological recursion associates to a spectral curve, a sequence of
meromorphic differential forms. A tangent space to the "moduli space" of
spectral curves (its space of deformations) is locally described by meromorphic
1-forms, and we use form-cycle duality to re-express it in terms of cycles
(generalized cycles). This formulation allows to express the ABCD tensors of
Quantum Airy Structures acting on the vector space of cycles, in an intrinsic
spectral-curve geometric way.
