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Mirrors > Home > MPE Home > Th. List > nmmul | Structured version Visualization version GIF version |
Description: The norm of a product in a normed ring. (Contributed by Mario Carneiro, 5-Oct-2015.) |
Ref | Expression |
---|---|
nmmul.x | ⊢ 𝑋 = (Base‘𝑅) |
nmmul.n | ⊢ 𝑁 = (norm‘𝑅) |
nmmul.t | ⊢ · = (.r‘𝑅) |
Ref | Expression |
---|---|
nmmul | ⊢ ((𝑅 ∈ NrmRing ∧ 𝐴 ∈ 𝑋 ∧ 𝐵 ∈ 𝑋) → (𝑁‘(𝐴 · 𝐵)) = ((𝑁‘𝐴) · (𝑁‘𝐵))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nmmul.n | . . 3 ⊢ 𝑁 = (norm‘𝑅) | |
2 | eqid 2735 | . . 3 ⊢ (AbsVal‘𝑅) = (AbsVal‘𝑅) | |
3 | 1, 2 | nrgabv 24698 | . 2 ⊢ (𝑅 ∈ NrmRing → 𝑁 ∈ (AbsVal‘𝑅)) |
4 | nmmul.x | . . 3 ⊢ 𝑋 = (Base‘𝑅) | |
5 | nmmul.t | . . 3 ⊢ · = (.r‘𝑅) | |
6 | 2, 4, 5 | abvmul 20839 | . 2 ⊢ ((𝑁 ∈ (AbsVal‘𝑅) ∧ 𝐴 ∈ 𝑋 ∧ 𝐵 ∈ 𝑋) → (𝑁‘(𝐴 · 𝐵)) = ((𝑁‘𝐴) · (𝑁‘𝐵))) |
7 | 3, 6 | syl3an1 1162 | 1 ⊢ ((𝑅 ∈ NrmRing ∧ 𝐴 ∈ 𝑋 ∧ 𝐵 ∈ 𝑋) → (𝑁‘(𝐴 · 𝐵)) = ((𝑁‘𝐴) · (𝑁‘𝐵))) |
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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