Let *n* be a positive integer and be the set of real numbers. Then, ^{n} is the set of all *n*-tuples (*x*_{1}, *x*_{2},…, *x*_{n}), *x*_{n} ∊ . Thus,

is the set of all real numbers called, the *real line*,

^{2} = × = {(*x*, *y*): *x*, *y* } is a *two-dimensional ...*

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