What is...the coordinate ring?

[@karinasakurai6599]

Wow nice explanation!!

[@VisualMath]

Thanks, I am glad that the explanation worked for you ☺

[@pseudolullus]

The variety-ideal approach to the connection between algebra and geometry took me quite some effort to grasp, but it's very clever

[@VisualMath]

Yes, its a nontrivial step. Quite brilliant and powerful; I hope you like it 😃