The story is told about a dog that was good at math. “What is 1 x 1?” it would be asked, and it would bark once. “What is 1 x 2?” It would bark twice. One night, a drunk stopped at the dog’s ...

We relate the problem of computing the closure of a finitely generated subgroup of the free group in the pro- V topology, where V is a pseudovariety of finite groups, with an extension problem for ...

It was a nice try, but incorrect. A few others came up with 42.5 dogs as the answer, with one woman explaining her method as follows: "49-36=13. 13/2=6.5. 36+6.5=42.5. That's how I did it in my ...