After Centuries, a Simple Math Problem Gets an Exact Solution Mathematicians have long pondered a deceptively easy puzzle about the reach of a goat tied to a fence.

A simple arithmetic problem has left internet users scratching their heads - with only a few landing on the correct solution to this elementary school-level equation.

Inverse Problems in Differential Equations Publication Trend The graph below shows the total number of publications each year in Inverse Problems in Differential Equations.

Here’s a simple-sounding problem: Imagine a circular fence that encloses one acre of grass. If you tie a goat to the inside of the fence, how long a rope do you need to allow the animal access to ...