I have a question for all you philosophy majors out there. Currently I'm reading Wittgenstein's Tractatus and I'm stuck at 3.333. I understood it except for the last part
"This is at once clear, if instead of "F(Fu)” we write “(∃φ):F(φu) . φu = Fu”."
Understanding it seems to be arbitrary for now since what is written before it gets the point across but just of sheer curiosity I'd like to understand what the elements of “(∃φ):F(φu) . φu = Fu” mean.