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Theorem nmmul 24701
Description: The norm of a product in a normed ring. (Contributed by Mario Carneiro, 5-Oct-2015.)
Hypotheses
Ref Expression
nmmul.x 𝑋 = (Base‘𝑅)
nmmul.n 𝑁 = (norm‘𝑅)
nmmul.t · = (.r𝑅)
Assertion
Ref Expression
nmmul ((𝑅 ∈ NrmRing ∧ 𝐴𝑋𝐵𝑋) → (𝑁‘(𝐴 · 𝐵)) = ((𝑁𝐴) · (𝑁𝐵)))

Proof of Theorem nmmul
StepHypRef Expression
1 nmmul.n . . 3 𝑁 = (norm‘𝑅)
2 eqid 2735 . . 3 (AbsVal‘𝑅) = (AbsVal‘𝑅)
31, 2nrgabv 24698 . 2 (𝑅 ∈ NrmRing → 𝑁 ∈ (AbsVal‘𝑅))
4 nmmul.x . . 3 𝑋 = (Base‘𝑅)
5 nmmul.t . . 3 · = (.r𝑅)
62, 4, 5abvmul 20839 . 2 ((𝑁 ∈ (AbsVal‘𝑅) ∧ 𝐴𝑋𝐵𝑋) → (𝑁‘(𝐴 · 𝐵)) = ((𝑁𝐴) · (𝑁𝐵)))
73, 6syl3an1 1162 1 ((𝑅 ∈ NrmRing ∧ 𝐴𝑋𝐵𝑋) → (𝑁‘(𝐴 · 𝐵)) = ((𝑁𝐴) · (𝑁𝐵)))
Colors of variables: wff setvar class
Syntax hints:  wi 4  w3a 1086   = wceq 1537  wcel 2106  cfv 6563  (class class class)co 7431   · cmul 11158  Basecbs 17245  .rcmulr 17299  AbsValcabv 20826  normcnm 24605  NrmRingcnrg 24608
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1792  ax-4 1806  ax-5 1908  ax-6 1965  ax-7 2005  ax-8 2108  ax-9 2116  ax-10 2139  ax-11 2155  ax-12 2175  ax-ext 2706  ax-sep 5302  ax-nul 5312  ax-pow 5371  ax-pr 5438  ax-un 7754
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1540  df-fal 1550  df-ex 1777  df-nf 1781  df-sb 2063  df-mo 2538  df-eu 2567  df-clab 2713  df-cleq 2727  df-clel 2814  df-nfc 2890  df-ne 2939  df-ral 3060  df-rex 3069  df-rab 3434  df-v 3480  df-sbc 3792  df-dif 3966  df-un 3968  df-in 3970  df-ss 3980  df-nul 4340  df-if 4532  df-pw 4607  df-sn 4632  df-pr 4634  df-op 4638  df-uni 4913  df-br 5149  df-opab 5211  df-mpt 5232  df-id 5583  df-xp 5695  df-rel 5696  df-cnv 5697  df-co 5698  df-dm 5699  df-rn 5700  df-res 5701  df-ima 5702  df-iota 6516  df-fun 6565  df-fn 6566  df-f 6567  df-fv 6571  df-ov 7434  df-oprab 7435  df-mpo 7436  df-map 8867  df-abv 20827  df-nrg 24614
This theorem is referenced by:  nrgdsdi  24702  nrgdsdir  24703  nminvr  24706  nmdvr  24707  nrginvrcnlem  24728
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