Isaac Barrow was an English Christian theologian and mathematician who is generally given credit for his early role in the development of infinitesimal calculus; in particular, for the discovery of the fundamental theorem of calculus.

His work centered on the properties of the tangent; Barrow was the first to calculate the tangents of the kappa curve. Isaac Newton was a student of Barrow’s, and Newton went on to develop calculus in a modern form.

- Date of birth:
- 10-1630
- Date of death:
- 4th May, 1677

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