2 problems

Conjectured trial-function form. For every $n=1,2,\ldots$, this form should provide an energy accuracy of at least 3 decimal digits (non-rounded). The proposed form extends the exp…

Let $Z$ denote the nuclear charge of a helium-like system, and let $E(Z)$ be its ground-state energy. Majorana's conjecture. A polynomial of degree two in $Z$ can approximate…