How Did the Camera Move?
Anders Thorup · Communications in Algebra · 2003
Given 5 points in 3-space and two snapshots of these points, taken with a camera at two different positions. Then, in general, there are 10 possibilities for the second position of the camera relative to its first position. The result is well known. We prove it using the Thom–Porteous Formula. Dedicated to Steven L. Kleiman on the occasion of his 60th birthday.