titles in python notebook code example
Example 1: jupyter change cell to text
# press on the blank space in front of the cell, then press mExample 2: summation in jupyter markdown
$$e^x=\sum_{i=0}^\infty \frac{1}{i!}x^i$$# press on the blank space in front of the cell, then press m$$e^x=\sum_{i=0}^\infty \frac{1}{i!}x^i$$