Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2019-03-26 19:07 df08058b

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refactor(analysis/normed_space): rename norm_mul -> norm_mul_le; use norm_mul for the equality in normed fields; and norm_mul_le for the inequality in normed_rings

Estimated changes

modified theorem norm_mul
added theorem norm_mul_le
modified theorem norm_pow
added theorem norm_pow_le
added theorem norm_prod
deleted theorem normed_field.norm_pow