I come from a maths background, and I disagree. Maths would more likely use ":=" for mutating assignment, not ":", which I've never seen. I also don't think I'

I come from a maths background, and I disagree. Maths would more likely use ":=" for mutating assignment, not ":", which I've never seen. I also don't think I've ever seen a sequence of steps in maths denoted by parentheses. More commonly they're in a numbered list. 1960's ALGOL-60 used ":=" for assignment and "begin" and "end" for blocks.