Everything but notation. Newton calculus is a little under developed because of its once scarce use.
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Newton and Leibniz
Issac Newton and Leibniz
No, Newton and Leibniz independently developed calculus.
The argument between Newton and Liebniz (and others) revolved around whether or not Newton was the first to invent calculus and/or if Leibniz developed his calculus independently of Newton or if he simply used different notation.The problem was that Newton did not publish his initial work.
Issac Newton and Leibniz developed it independently. Newton discovered it first, but kept it to himself. Leibniz, on the other hand, published. Newton accused Liebnitz of stealing his ideas, thus starting a long feud between the two. Today, they are both recognized as being the founding fathers of calculus. It is however, Leibniz's notation of the calculus that has flourished.