Math proves often start with "let". For example: Let A be a set. This is easy. But what about introducing several things in that manner? Let A be a set, B be a group, and C be a number. ...
For the mathematically inclined fellows: If f is a function whose domain is the set A, do you say that f is defined on A or over A? Do both prepositions apply here or is the use of one of them ...
In British English, which one is correct? Does one parameterise a curve or parametrise it?
As a matter of fact, these two words are used a lot in mathematical contexts. Often, we use them interchangeably; but I do realize that that might not be correct. What should I do about this matter? ...
I remember somebody correcting me once when I said, "Two and two makes four", since the conjunction and would imply the use of a plural verb. They would prefer I said: Two and two make four. ...