Jensen's inequality

A proof of Jensen's inequality. Work: https://drive.google.com/file/d/1_TM4tV1HaZCCYfA1PBjrwl0N-nC8qiDk/view?usp=sharing More on the average slope of curves: https://youtu.be/yRA-WnDjlao More on convexity: https://youtu.be/R8atxkqzuiw