An explicit linear estimate for the number of zeros of Abelian integrals

An Abelian integral is the integral over the level curves of a Hamiltonian H of an algebraic form ω. The infinitesimal Hilbert sixteenth problem calls for the study of the number of zeros of Abelian integrals in terms of the degrees H and ω. Petrov and Khovanskii have shown that this number grows at most linearly with the degree of ω, but gave a purely existential bound. Binyamini, Novikov and Yakovenko have given an explicit bound growing doubly exponentially with the degree. We combine the techniques used in the proofs of these two results, to obtain an explicit bound on the number of zeros of Abelian integrals growing linearly with deg ω.