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magnitude

How big a number is, ignoring its sign or direction -- $|x|$ for a real number, or the length of the arrow for a complex one.

A real number's magnitude $|x|$ is its size with the sign stripped off. A complex number's magnitude $|x|=\sqrt{a^2+b^2}$ is the length of the arrow from the origin to $x=a+jb$ in the complex plane -- the same idea, one dimension up.

See also

complex conjugate

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grid intersections

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