Taxicab Norm is Norm
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Theorem
The taxicab norm is a norm on the real and complex numbers.
Proof
By P-Norm is Norm, $\norm {\, \cdot \,}_p$ is a norm.
By definition, the taxicab norm is $\norm {\, \cdot \,}_1$.
Therefore, the taxicab norm is a norm.
$\blacksquare$