Bizarre Pool Shots Spiral to Infinity

摘要

If a mathematician invites you to play billiards, watch out. You're likely to wind up trying to make shots on a table of some weird, polygonal shape—or even on the outside of such a table.rnThe notion of "outer billiards" was proposed in the 1950s by Bernhard Neumann and popularized (among mathematicians and mathematically minded physicists) in the 1970s by Jiirgen Moser as a stripped-down "toy" model of planetary motion.