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Well in reality there is no actual "founder" of math, but there are discoverers. Even though they were discoverers doesn't mean that they thought about their concept first. But anyway I'll name some that are well known.

Sir Isaac Newton - Discovered Calculus by thinking of functions approaching zero and how they show patterns. 

Algebra was discovered by a Muslim scholar in around the peak of the Islamic Era. 

Math is nothing but proofs and theorems. As long as the proofs and theorems make sense then they are accepted as math.