What decscribes a vector?

Updated: 11/1/2022
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A vector is a quantity described by size and direction.

Mathematically, the square of a vector is negative, e.g. i^2 = -1, thus a quantity whose square is negative is a vector, e.g. 5i is a vector because (5i)^2 = -25.

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Q: What decscribes a vector?
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