ABSTRACT
It is not worthy of the educated man to waste his time in slave’s work, that is calculus, with can be performed by the first one to come which has a calculator.
Wilhem Leibnitz (1646–1716), invented in 1673 a mechanical arithmetic calculator able of the four operations.
Comment: laborious teaching of integration or derivation rules is not worth, most 2018 formal calculus software do it perfectly.
