*I certainly would welcome advice on topology.

*I also would like to see some advice on that. From what I learned on the few lessons on topology I had in my student years is that a dougnut is similar to a coffee cup, because they both have a hole. But that's as far as my knowledge goes about it. Geometry is more my cup of coffee.

regards,

Bopper

-How can you improve things when you don't make mistakes?