> I have not time to send you the demonstration of a difficulty which greatly astonished M. de Mere, for he has a very good mind, but he is not a geometer (this is, as you know, a great defect) and he does not even understand that a mathematical line is divisible to infinity and believes very well to understand that it is composed of points in finite number, and never have I been able to pull him from it. If you could do that, one would render him perfect.