[JadeNB]

> This makes me wonder whether the usual order for function application is an artifact of the S-V-O sentence structure in western European languages. Maybe if Euler had been raised in a language with a S-O-V sentence structure, we would write (x)f instead.

Herstein's Topics in algebra uses that notation for function application. It's surely not a coincidence that he was Polish, and that that reminds one of RPN.