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Calculus was method of calculation, especially one of several highly systematic methods of treating problems by a special system of algebraic notations, as differential or integral calculus.

Although it existed in its modern format since being discovered on Old Earth in the 17th Century AD, it was Doctor Rahzhyr Mahklyn who "re-invented" it on Safehold, with some assistance of Merlin Athrawes. (MTAT)