What ... ? Well, assuming (P → Q) would make it valid. But ... assuming (P → (P → Q)). And so would assuming (P ... → (P → (P → Q))). And so would assuming (P ... or ~R) → Q, ((R or ~R) → Q) → Q, and so on. You ...
... .com/discussion/#/discussion/7343/pt1-s3-q11-water-vapor-evaporated-from ... the formate of PT#.S#.Q# (https://7sage.com/discussion/#/discussion ...
... .**
> 1. Glance at q stem, determine it's a ... this
>
> **S3. Q15:**
> 1. Glance ... at q stem, determine it's a ... recorded my answer incorrectly for S3 Q15 in PT 64, but ...