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| Mirrors > Home > MPE Home > Th. List > tngngpd | Structured version Visualization version GIF version | ||
| Description: Derive the axioms for a normed group from the axioms for a metric space. (Contributed by Mario Carneiro, 4-Oct-2015.) |
| Ref | Expression |
|---|---|
| tngngp.t | ⊢ 𝑇 = (𝐺 toNrmGrp 𝑁) |
| tngngp.x | ⊢ 𝑋 = (Base‘𝐺) |
| tngngp.m | ⊢ − = (-g‘𝐺) |
| tngngp.z | ⊢ 0 = (0g‘𝐺) |
| tngngpd.1 | ⊢ (𝜑 → 𝐺 ∈ Grp) |
| tngngpd.2 | ⊢ (𝜑 → 𝑁:𝑋⟶ℝ) |
| tngngpd.3 | ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑋) → ((𝑁‘𝑥) = 0 ↔ 𝑥 = 0 )) |
| tngngpd.4 | ⊢ ((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → (𝑁‘(𝑥 − 𝑦)) ≤ ((𝑁‘𝑥) + (𝑁‘𝑦))) |
| Ref | Expression |
|---|---|
| tngngpd | ⊢ (𝜑 → 𝑇 ∈ NrmGrp) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | tngngpd.1 | . 2 ⊢ (𝜑 → 𝐺 ∈ Grp) | |
| 2 | tngngpd.2 | . . . 4 ⊢ (𝜑 → 𝑁:𝑋⟶ℝ) | |
| 3 | tngngp.x | . . . . . 6 ⊢ 𝑋 = (Base‘𝐺) | |
| 4 | 3 | fvexi 6896 | . . . . 5 ⊢ 𝑋 ∈ V |
| 5 | reex 11191 | . . . . 5 ⊢ ℝ ∈ V | |
| 6 | fex2 7933 | . . . . 5 ⊢ ((𝑁:𝑋⟶ℝ ∧ 𝑋 ∈ V ∧ ℝ ∈ V) → 𝑁 ∈ V) | |
| 7 | 4, 5, 6 | mp3an23 1479 | . . . 4 ⊢ (𝑁:𝑋⟶ℝ → 𝑁 ∈ V) |
| 8 | tngngp.t | . . . . 5 ⊢ 𝑇 = (𝐺 toNrmGrp 𝑁) | |
| 9 | tngngp.m | . . . . 5 ⊢ − = (-g‘𝐺) | |
| 10 | 8, 9 | tngds 24774 | . . . 4 ⊢ (𝑁 ∈ V → (𝑁 ∘ − ) = (dist‘𝑇)) |
| 11 | 2, 7, 10 | 3syl 19 | . . 3 ⊢ (𝜑 → (𝑁 ∘ − ) = (dist‘𝑇)) |
| 12 | tngngp.z | . . . 4 ⊢ 0 = (0g‘𝐺) | |
| 13 | tngngpd.3 | . . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑋) → ((𝑁‘𝑥) = 0 ↔ 𝑥 = 0 )) | |
| 14 | tngngpd.4 | . . . 4 ⊢ ((𝜑 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → (𝑁‘(𝑥 − 𝑦)) ≤ ((𝑁‘𝑥) + (𝑁‘𝑦))) | |
| 15 | 3, 9, 12, 1, 2, 13, 14 | nrmmetd 24700 | . . 3 ⊢ (𝜑 → (𝑁 ∘ − ) ∈ (Met‘𝑋)) |
| 16 | 11, 15 | eqeltrrd 2870 | . 2 ⊢ (𝜑 → (dist‘𝑇) ∈ (Met‘𝑋)) |
| 17 | eqid 2769 | . . . 4 ⊢ (dist‘𝑇) = (dist‘𝑇) | |
| 18 | 8, 3, 17 | tngngp2 24778 | . . 3 ⊢ (𝑁:𝑋⟶ℝ → (𝑇 ∈ NrmGrp ↔ (𝐺 ∈ Grp ∧ (dist‘𝑇) ∈ (Met‘𝑋)))) |
| 19 | 2, 18 | syl 18 | . 2 ⊢ (𝜑 → (𝑇 ∈ NrmGrp ↔ (𝐺 ∈ Grp ∧ (dist‘𝑇) ∈ (Met‘𝑋)))) |
| 20 | 1, 16, 19 | mpbir2and 725 | 1 ⊢ (𝜑 → 𝑇 ∈ NrmGrp) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 209 ∧ wa 400 = wceq 1567 ∈ wcel 2149 Vcvv 3461 class class class wbr 5111 ∘ ccom 5666 ⟶wf 6533 ‘cfv 6537 (class class class)co 7411 ℝcr 11099 0cc0 11100 + caddc 11103 ≤ cle 11244 Basecbs 17269 distcds 17319 0gc0g 17492 Grpcgrp 19000 -gcsg 19002 Metcmet 21477 NrmGrpcngp 24703 toNrmGrp ctng 24704 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1822 ax-4 1836 ax-5 1937 ax-6 1994 ax-7 2035 ax-8 2151 ax-9 2159 ax-10 2182 ax-11 2198 ax-12 2219 ax-ext 2741 ax-rep 5240 ax-sep 5259 ax-nul 5271 ax-pow 5337 ax-pr 5405 ax-un 7733 ax-cnex 11156 ax-resscn 11157 ax-1cn 11158 ax-icn 11159 ax-addcl 11160 ax-addrcl 11161 ax-mulcl 11162 ax-mulrcl 11163 ax-mulcom 11164 ax-addass 11165 ax-mulass 11166 ax-distr 11167 ax-i2m1 11168 ax-1ne0 11169 ax-1rid 11170 ax-rnegex 11171 ax-rrecex 11172 ax-cnre 11173 ax-pre-lttri 11174 ax-pre-lttrn 11175 ax-pre-ltadd 11176 ax-pre-mulgt0 11177 ax-pre-sup 11178 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1102 df-3an 1103 df-tru 1570 df-fal 1580 df-ex 1807 df-nf 1811 df-sb 2098 df-mo 2573 df-eu 2603 df-clab 2748 df-cleq 2761 df-clel 2844 df-nfc 2918 df-ne 2965 df-nel 3071 df-ral 3086 df-rex 3096 df-rmo 3375 df-reu 3376 df-rab 3423 df-v 3463 df-sbc 3752 df-csb 3860 df-dif 3914 df-un 3916 df-in 3918 df-ss 3928 df-pss 3931 df-nul 4293 df-if 4491 df-pw 4567 df-sn 4593 df-pr 4595 df-op 4599 df-uni 4875 df-iun 4960 df-br 5112 df-opab 5176 df-mpt 5195 df-tr 5221 df-id 5557 df-eprel 5562 df-po 5570 df-so 5571 df-fr 5615 df-we 5617 df-xp 5668 df-rel 5669 df-cnv 5670 df-co 5671 df-dm 5672 df-rn 5673 df-res 5674 df-ima 5675 df-pred 6303 df-ord 6364 df-on 6365 df-lim 6366 df-suc 6367 df-iota 6493 df-fun 6539 df-fn 6540 df-f 6541 df-f1 6542 df-fo 6543 df-f1o 6544 df-fv 6545 df-riota 7368 df-ov 7414 df-oprab 7415 df-mpo 7416 df-om 7863 df-1st 7986 df-2nd 7987 df-frecs 8278 df-wrecs 8309 df-recs 8358 df-rdg 8397 df-er 8694 df-map 8826 df-en 8944 df-dom 8945 df-sdom 8946 df-sup 9402 df-inf 9403 df-pnf 11245 df-mnf 11246 df-xr 11247 df-ltxr 11248 df-le 11249 df-sub 11443 df-neg 11444 df-div 11872 df-nn 12234 df-2 12303 df-3 12304 df-4 12305 df-5 12306 df-6 12307 df-7 12308 df-8 12309 df-9 12310 df-n0 12505 df-z 12592 df-dec 12712 df-uz 12863 df-q 12973 df-rp 13017 df-xneg 13137 df-xadd 13138 df-xmul 13139 df-sets 17224 df-slot 17242 df-ndx 17254 df-base 17270 df-plusg 17323 df-tset 17329 df-ds 17332 df-rest 17475 df-topn 17476 df-0g 17494 df-topgen 17496 df-mgm 18698 df-sgrp 18777 df-mnd 18793 df-grp 19003 df-minusg 19004 df-sbg 19005 df-psmet 21483 df-xmet 21484 df-met 21485 df-bl 21486 df-mopn 21487 df-top 23020 df-topon 23037 df-topsp 23059 df-bases 23072 df-xms 24446 df-ms 24447 df-nm 24708 df-ngp 24709 df-tng 24710 |
| This theorem is referenced by: tngngp 24780 tngngp3 24782 tcphcph 25365 |
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