Talk:Constant factor rule in integration

The first equation shown as an example is too complicated, why not just \int k f = k \int f? Also, nowhere is stated what f is. Is it cts.? Is it integrable?Is it differentiable? The proof just assumes it to be. Also, first line of proof is already wrong, additive constant is missing. I'd suggest deletion since the main article on integration already covers this multiplicative property. --188.194.208.1 (talk) 16:09, 3 October 2019 (UTC)