Here's a question: is it OK to omit parentheses around the argument to a non-standard function?

Like, "sin x = sin(x)" and "log z = log(z)" are common, but what about "f x = f(x)"?

Does the function name need to be more than one letter?

"flop x = flop(x)"

@christianp I think it applies to very antique functions like trigonometric and log

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