To write "the chance that both X and Y are true" using standard Probability notation, we write $~$\mathbb{P}(X \wedge Y)$~$ or $~$\mathbb{P}(X, Y)$~$.

https://arbital.com/p/joint_probability

by Eliezer Yudkowsky Jan 26 2016 updated Jun 16 2016

The notation for writing the chance that both X and Y are true.

To write "the chance that both X and Y are true" using standard Probability notation, we write $~$\mathbb{P}(X \wedge Y)$~$ or $~$\mathbb{P}(X, Y)$~$.