>>725068330
As an engineer and part time philosopher I can tell you that some math is discovered and other math is invented.
Where we draw the line is slightly fuzzy but there are clear cases of discoverable math (observable concepts like the number of fingers, and their philosophical extensions like "infinity") but others are more clearly invented (like imaginary numbers, by their very name).

>>725068443
"Can be" is a poisonous term because it's limited by current capabilities. Give life a year or a decade and what "can be" done will drastically change.