My desire is that everything on this website (except in the store) shall remain free of obligatory cost to all who visit.
I am also determined that the site shall remain advertising free.
Please donate as you are able and in a manner that you think is reasonable for what you have been able to obtain from my work.
Thank you very much for your support!
thank you for the video! it was mind blowing!
Andy K (on a CCM YouTube video about Using Zeros to Create Complex Graphs)
See all Testimonials