Norm -- from Wolfram MathWorld
https://mathworld.wolfram.com/Norm.html
WEBMar 15, 2024 · Norm. The norm of a mathematical object is a quantity that in some (possibly abstract) sense describes the length, size, or extent of the object. Norms exist for complex numbers (the complex modulus, sometimes also called the complex norm or simply "the norm"), Gaussian integers (the same as the complex modulus , but …
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