Definition talk:Field Norm of Complex Number

We have Modulus is Norm which suggests that the "norm" is $\sqrt {a^2 + b^2}$. Can this be reviewed? --prime mover (talk) 03:41, 30 July 2017 (EDT)


 * This is another type of norm, so this definition is unrelated to that theorem. It says "Modulus is Norm" because what is usually called "absolute value" is called "Norm" on . Norm has a lot of different meanings. Modulus and Absolute Value do not. --barto (talk) 04:16, 30 July 2017 (EDT)


 * For example, a "Norm" on the complex numbers could either be an absolute value or a norm when $\C$ is viewed as a vector space over, say, $\R$. Those interpretations are not equivalent. --barto (talk) 04:19, 30 July 2017 (EDT)


 * In which case it is incorrect to call it "the norm", yeah? Should be "a norm", surely? --prime mover (talk) 05:14, 30 July 2017 (EDT)


 * Ah, actually it is correct. This norm is neither of those :) It's used in algebraic number theory, mostly. Especially in the introductary parts, before defining the more general field norm. Similarly, a norm is often frist defined for specific quadratic extensions, or for e.g. eisenstein integer (as in Ireland & Rosen, Chapter 9 on reciprocity, and many other books on number theory). Of all norms, field norm is the closest to these. --barto (talk) 06:04, 30 July 2017 (EDT)