@ 9:30 I begin wondering what down votes (=2 at the moment) are for. It appears that definition in this video is less general than conventional one. For example, the polynomial ring modulo Z/3Z in the example @9:00 is conventionally known as Z[x]/(x^3-3x^2-2x).
this was impressive. most other explanations seem trivial and handwavy
@ 9:30 I begin wondering what down votes (=2 at the moment) are for. It appears that definition in this video is less general than conventional one. For example, the polynomial ring modulo Z/3Z in the example @9:00 is conventionally known as Z[x]/(x^3-3x^2-2x).