Foundational Mathematics 86–90

86. Theorem
There is a theorem with its proof.

87. Permutation
-Definition
-Proposition

88. Permutation in Order-Pair for Functions
Here shows the methods of permutation in order-pair for functions. It also has an example to assist us understand.

89. Functions and Partitions
-Proposition
- Note
-Example

90. Real-Valued Function
-Definition
-Example

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