Section 23

The hardest thing for me to understand about this section was the addition and multiplication of congruence equivalence classes. I just don't understand the concept or the computation behind it. Does it mean that you add the values together, or the congruences, or the sets?

I mostly understood how the congruence classes are formed, like 1,5,9,13 are all in the same mod 4 congruence class. But beyond that I didn't really understand the section, so I think it will help when I hear it explained in person.

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