Definition:Norm


 * Abstract algebra:
 * Norm (Division Ring), a concept similar to the absolute value on $\R$
 * Norm (Vector Space), a concept encompassing the usual norm on $\R^n$


 * Analysis:
 * Absolute Value, the well-known absolute value function on the real numbers $\R$
 * Modulus of Complex Number, an example of a norm on a division ring


 * Functional analysis:
 * Norm (Linear Transformation), also commonly known as the operator norm
 * Norm (Linear Functional), a useful special case of the above