>>16755619
nigger you're retarded
>ooh imperial is defined in metric
yeah, and what's metric defined in? A fraction of the speed of light in some amount of beryllium vibrations. You could equivalently define Imperial so, and define metric off of it. (Hence, it doesn't fucking matter)
>derivates
stfu, it's not about derivatives
>functions
nigga it's a simple ratio, for any f(x) you have a unique f^-1(x)