On Dec 31, 2012, at 4:43 AM, GS Chandy <gs_chandy@yahoo.com> wrote:

I would guess that your son has actually understood infinity in a deeper way than any 'formal definition' (or 'formal thought') about it than you could give him at this stage of his life could teach him.

Yes, I have taught him well, and I hope no one thought I was at the stage of giving him formal definitions.

Bob Hansen