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Discrete mathematics. Why? SXS->； What is s? Why do you want to write like this! ! ! Why can it stand for addition?
SXS is not a Cartesian product, it is just a symbol used when defining the function f,

F: s+s → s can also be defined as binary operation on S, which is called binary operation for short. It is also called S-F closure.

X and+here are binary operators, and the specific operations can be multiplication and division ... The specific problems are being analyzed.

For example 1

F: n+n→ n. It means that addition is a binary operation on the set of natural numbers n, and n is close to F.

F: n× n→ n. It means that multiplication is a binary operation on the set of natural numbers n, and n is close to F.

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