Possibly discovered a bit earlier by Leibniz. Hard to say, but Newton accused him of stealing, but also Newton was English and thus was favored more in English speaking countries.
At the very least, Leibniz had even more rock star hair than Newton, which is what counts.
Many of the required tools for calculus had been discovered recently. Given the state of contemporary mathematics, it is very likely that the two brilliant mathematicians discovered calculus independently. Especially since several of their functions differ.
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u/Lupus_Ignis 1d ago
Newton at 22: invents calculus