Historic geometric theorem (January 2020): https://drive.g…

Historic geometric theorem (January 2020):

https://drive.google.com/file/d/1RDulODvgncItTe7qNI1d8KTN5bl0aTXj

How this theorem led to second rigorous formulation of calculus:

https://drive.google.com/file/d/1uIBgJ1ObroIbkt0V2YFQEpPdd8l-xK6y