A note on Arhangelskii's inequality
A well-known method is applied to show that, if X is a Hausdorff space then Shapirovskij's inequality \(| X| \leq \exp (L(X)\cdot \psi (X)\cdot t(X))\) can be improved to \(| X| \leq \exp (qL(X)\cdot S\psi (X)\cdot t(X))\), where qL(X) and \(S\psi\) (X) are quasi-Lindelöf number and a strong pseudocharacter of X, resp.
scientific article; zbMATH DE number 4036696