## Day 1 MATHFEST 2019

Well, my attempt to run was a bust; it was hotter than I was used to and I ended up turning it into a 5K-ish “run/walk” which was shortened due to the nearby Trump rally. I didn’t go to that, though I saw the motorcade.

The talks: 3 main talks: first one was about decision making, utility and rationality. Second talk: equilibrium and games where selfish behavior ruins it for everyone. Third main talk: was about the mathematics of stable n-body problems and an interesting question about when an analytic function with a 1’st order zero at 0 and derivative equal to $\lambda$ can be linearized by a change of coordinates. Hint: the case $|\lambda | =1$ is the trouble case.