2 problems

In a three-particle system exhibiting the Efimov effect, let $E_n$ denote the energy of the $n$-th Efimov level, and let $s_0=\pi\mathfrak{U}_0$, where $\mathfrak{U}_0$ is the univ…

Let $H$ be the Hamiltonian of $N=4$ particles in the setting of $(1.08;3)$--$(1.08;4)$, with all pair potentials $v_{ik}\leq 0$ bounded and of finite range. Suppose … that the pair…