721
I dunno
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A place for majestic STEMLORD peacocking, as well as memes about the realities of working in a lab.

Rules
This is a science community. We use the Dawkins definition of meme.
Some forms of programming syntax, although there are the fringe cases where an equation (or function in programming) is represented by a symbol in conjunction with a parentheses input.
For example:
y(x) = 2*x+3
5+y(1) = 10, as 1 is substituted in for x in the prior equation.
And in some languages a number can be used as a name of a variable or a function, so it can be anything really
Not in most programming languages, though. You cannot start names with a number. Unless you're using some strange character that merely looks like a number, anyways. Programming with unicode can get weird but generally works without issue these days.
Wouldn't we just assume function expressions are always "in parenthesis"? Then it's just a substitution and no rules were changed.