If that enabled us to predict the succeeding situation with the same approximation, that is all we require, and we should say that the phenomenon had been predicted, that it is governed by the laws.

Thought is only a flash between two long nights, but this flash is everything.

Henri Poincare

 

If one looks at the different problems of the integral calculus which arise naturally when one wishes to go deep into the different parts of physics, it is impossible not to be struck by the analogies existing.

It has adopted the geometry most advantageous to the species or, in other words, the most convenient.