Say I am reading a paper with a PDF reader on a tablet and I get to
... the second inequality follows from Lemma 3.2 ...
and I click on the text "Lemma 3.2" to jump to Lemma 3.2. Now that I reminded myself of what Lemma 3.2 was, I need to go back to the page I was reading before the jump.
In case of Adobe Reader which I am using on my phone, the physical back button (which I believe corresponds to the system back button) simply gets me to the recent files list.
Is there a way to navigate back after an inter-page jump in a PDF reader?