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Search options not deleted user 17525

For questions requesting examples of a certain structure or phenomenon

77 votes

Examples where it's useful to know that a mathematical object belongs to some family of objects

In a way, you can think of calculus as using exactly this sort of idea. Say you are interested in determining the area of the region consisting of points (x,y) with $a \le x \le b$ and $0 \le y \le …