There is a strict common language to express it. The speaker used that language (except for the nonstandard replacement of brackets with square brackets, which

There is a strict common language to express it. The speaker used that language (except for the nonstandard replacement of brackets with square brackets, which was apparently clearly pointed out at the start). The problems start when you speak in plain English: then you get things like everyone using different definitions of continuity and thinking everyone else is just spouting nonsense until someone comes up with epsilon-deltas.