## Math on a bridge

God Plays Dice posted a link to a photo of some mathematics displayed prominently on a bridge. (No not that bridge.) Below is the photograph of the mean value theorem on a bridge in Beijing. Does anyone know the story behind this? [photo by Vmenkov published under the Creative Commons Attribution ShareAlike 3.0 License]

## E-Z Pass, speeding tickets, and the mean value theorem

On Monday I gave a lecture on the mean value theorem in my Calculus I class.  The mean value theorem says that if is a differentiable function and , then there exists a value such that . That is, the average rate of change of the function over must be achieved (as an instantaneous rate…