With serious accusations of plagiarism floating around, why were Gottfried Leibniz and Isaac Newton involved in one of the greatest maths controversies of all time? Whose notation is still in use?

The question was a major intellectual controversy, which began simmering in 1699 and broke out in full force in 1711. Leibniz had published his work first, but Newton's supporters accused Leibniz of plagiarizing Newton's unpublished ideas. Leibniz died in 1716, shortly after the Royal Society, of which Newton was a member, found in Newton's favor. The modern consensus is that the two men developed their ideas independently.