I've seen in math and physics lectures delivered in English, that people use to abreviate the commonly very used word "Definition" by "Def n"(Def superscript n). What's the meaning of this n? That is, ...
In German mathematics, the expression ‘Zu zeigen’ exists, which translates to ‘to show’. It is used at the beginning of proofs (or the answers to exercises) to state what exactly will be shown in the ...
I wonder if "iff" is considered a real word (as LEO says) or is it just an abbreviation (as in Wiktionary)?