What does it mean to say something is an element of a solution set in maths?

chizben: What does it mean to say something is an element of a solution set in maths?
What does it mean to say something is an element of a solution set in maths?

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Answer by Me M
The solution set is just the group of all the valid solutions to a problem. To say something is an element of that set just means it belongs in that group:

It is a valid solution to the problem in question.