2 problems

Polynomiality and monodromy-invariance conjecture. Under these hypotheses, every function $u^i(\boldsymbol{v})$ belongs to the invariant polynomial ring…

Let $P_2^{[0]}$ be the second Hamiltonian structure of the principal hierarchy, and let $P_2$ denote its image under the quasi-Miura transformation … Here a Hamiltonian structure h…