Re: [math-fun] Possibility puzzle

Bill Gosper wrote:

Apparently, possibility is the intersection of probability with Boolean algebra. A certain 4th grade teacher decided to enrich Saxon Math with a few days of

What's Saxon Math? Does it involve the Angle bisector theorem?

reduced to bluffing with ambigrams: gosper.org/logic.png

I can remember an anecdote that in some Cambridge lecture on propositional logic, the lecturer wrote a few axioms such as this: (S ^ H) v N <==> (S v N) ^ (H v N) And then rotated the blackboard through 180° to give the remaining axioms. By the way, has anyone else realised that Soddy's hexlet generalises by adding extra layers of spheres? http://cp4space.wordpress.com/2014/02/15/soddys-hexlet/ Sincerely, Adam P. Goucher