A note on surjective cardinals

Jiaheng Jin, Guozhen Shen

For cardinals $\mathfrak{a}$ and $\mathfrak{b}$, we write $\mathfrak{a}{=}^{\ast }\mathfrak{b}$ if there are sets $A$ and $B$ of cardinalities $\mathfrak{a}$ and $\mathfrak{b}$, respect…