Foundational Mathematics 56–60

56. Theorem
There is a theorem with its proof.

57. Theorem
There are three theorems about partition and equivalence relation. That’s it, haha.

58. Congruent
-Definition
-Theorem

59. Congruence Class mod n
-Definition
-Example
-Theorem(with proof)

60. Addition and Multiplication of the Congruence Classes
-Definition
-Theorem

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