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Conflicting |_| and Norm/SemiNorm notations #1976

@mkerjean

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@mkerjean

When using the Norm module in unstable.v, lemmas for seminorms and norms as defined in this module, and lemmas for |_| as defined in numerical for mathcomp are in conflict. This is due to the fact that |_| does not inherit from the norm structure and should be solved when the Norm module is properly ported to mathcomp.

Moreover, naming is not coherent. One must use Num.Theory.ler_normD for using ler_normD on || (by default it applies to a seminorm) but Norm.Theory.normN to use normN on a seminorm (it applies by default to ||).

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