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| Mirrors > Home > MPE Home > Th. List > imasf1omet | Structured version Visualization version GIF version | ||
| Description: The image of a metric is a metric. (Contributed by Mario Carneiro, 21-Aug-2015.) |
| Ref | Expression |
|---|---|
| imasf1oxmet.u | ⊢ (𝜑 → 𝑈 = (𝐹 “s 𝑅)) |
| imasf1oxmet.v | ⊢ (𝜑 → 𝑉 = (Base‘𝑅)) |
| imasf1oxmet.f | ⊢ (𝜑 → 𝐹:𝑉–1-1-onto→𝐵) |
| imasf1oxmet.r | ⊢ (𝜑 → 𝑅 ∈ 𝑍) |
| imasf1oxmet.e | ⊢ 𝐸 = ((dist‘𝑅) ↾ (𝑉 × 𝑉)) |
| imasf1oxmet.d | ⊢ 𝐷 = (dist‘𝑈) |
| imasf1omet.m | ⊢ (𝜑 → 𝐸 ∈ (Met‘𝑉)) |
| Ref | Expression |
|---|---|
| imasf1omet | ⊢ (𝜑 → 𝐷 ∈ (Met‘𝐵)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | imasf1oxmet.u | . . 3 ⊢ (𝜑 → 𝑈 = (𝐹 “s 𝑅)) | |
| 2 | imasf1oxmet.v | . . 3 ⊢ (𝜑 → 𝑉 = (Base‘𝑅)) | |
| 3 | imasf1oxmet.f | . . 3 ⊢ (𝜑 → 𝐹:𝑉–1-1-onto→𝐵) | |
| 4 | imasf1oxmet.r | . . 3 ⊢ (𝜑 → 𝑅 ∈ 𝑍) | |
| 5 | imasf1oxmet.e | . . 3 ⊢ 𝐸 = ((dist‘𝑅) ↾ (𝑉 × 𝑉)) | |
| 6 | imasf1oxmet.d | . . 3 ⊢ 𝐷 = (dist‘𝑈) | |
| 7 | imasf1omet.m | . . . 4 ⊢ (𝜑 → 𝐸 ∈ (Met‘𝑉)) | |
| 8 | metxmet 24561 | . . . 4 ⊢ (𝐸 ∈ (Met‘𝑉) → 𝐸 ∈ (∞Met‘𝑉)) | |
| 9 | 7, 8 | syl 18 | . . 3 ⊢ (𝜑 → 𝐸 ∈ (∞Met‘𝑉)) |
| 10 | 1, 2, 3, 4, 5, 6, 9 | imasf1oxmet 24602 | . 2 ⊢ (𝜑 → 𝐷 ∈ (∞Met‘𝐵)) |
| 11 | f1ofo 6829 | . . . . 5 ⊢ (𝐹:𝑉–1-1-onto→𝐵 → 𝐹:𝑉–onto→𝐵) | |
| 12 | 3, 11 | syl 18 | . . . 4 ⊢ (𝜑 → 𝐹:𝑉–onto→𝐵) |
| 13 | eqid 2762 | . . . 4 ⊢ (dist‘𝑅) = (dist‘𝑅) | |
| 14 | 1, 2, 12, 4, 13, 6 | imasdsfn 17604 | . . 3 ⊢ (𝜑 → 𝐷 Fn (𝐵 × 𝐵)) |
| 15 | 1 | adantr 486 | . . . . . . . 8 ⊢ ((𝜑 ∧ (𝑎 ∈ 𝑉 ∧ 𝑏 ∈ 𝑉)) → 𝑈 = (𝐹 “s 𝑅)) |
| 16 | 2 | adantr 486 | . . . . . . . 8 ⊢ ((𝜑 ∧ (𝑎 ∈ 𝑉 ∧ 𝑏 ∈ 𝑉)) → 𝑉 = (Base‘𝑅)) |
| 17 | 3 | adantr 486 | . . . . . . . 8 ⊢ ((𝜑 ∧ (𝑎 ∈ 𝑉 ∧ 𝑏 ∈ 𝑉)) → 𝐹:𝑉–1-1-onto→𝐵) |
| 18 | 4 | adantr 486 | . . . . . . . 8 ⊢ ((𝜑 ∧ (𝑎 ∈ 𝑉 ∧ 𝑏 ∈ 𝑉)) → 𝑅 ∈ 𝑍) |
| 19 | 9 | adantr 486 | . . . . . . . 8 ⊢ ((𝜑 ∧ (𝑎 ∈ 𝑉 ∧ 𝑏 ∈ 𝑉)) → 𝐸 ∈ (∞Met‘𝑉)) |
| 20 | simprl 783 | . . . . . . . 8 ⊢ ((𝜑 ∧ (𝑎 ∈ 𝑉 ∧ 𝑏 ∈ 𝑉)) → 𝑎 ∈ 𝑉) | |
| 21 | simprr 785 | . . . . . . . 8 ⊢ ((𝜑 ∧ (𝑎 ∈ 𝑉 ∧ 𝑏 ∈ 𝑉)) → 𝑏 ∈ 𝑉) | |
| 22 | 15, 16, 17, 18, 5, 6, 19, 20, 21 | imasdsf1o 24601 | . . . . . . 7 ⊢ ((𝜑 ∧ (𝑎 ∈ 𝑉 ∧ 𝑏 ∈ 𝑉)) → ((𝐹‘𝑎)𝐷(𝐹‘𝑏)) = (𝑎𝐸𝑏)) |
| 23 | metcl 24559 | . . . . . . . . 9 ⊢ ((𝐸 ∈ (Met‘𝑉) ∧ 𝑎 ∈ 𝑉 ∧ 𝑏 ∈ 𝑉) → (𝑎𝐸𝑏) ∈ ℝ) | |
| 24 | 23 | 3expb 1138 | . . . . . . . 8 ⊢ ((𝐸 ∈ (Met‘𝑉) ∧ (𝑎 ∈ 𝑉 ∧ 𝑏 ∈ 𝑉)) → (𝑎𝐸𝑏) ∈ ℝ) |
| 25 | 7, 24 | sylan 592 | . . . . . . 7 ⊢ ((𝜑 ∧ (𝑎 ∈ 𝑉 ∧ 𝑏 ∈ 𝑉)) → (𝑎𝐸𝑏) ∈ ℝ) |
| 26 | 22, 25 | eqeltrd 2862 | . . . . . 6 ⊢ ((𝜑 ∧ (𝑎 ∈ 𝑉 ∧ 𝑏 ∈ 𝑉)) → ((𝐹‘𝑎)𝐷(𝐹‘𝑏)) ∈ ℝ) |
| 27 | 26 | ralrimivva 3207 | . . . . 5 ⊢ (𝜑 → ∀𝑎 ∈ 𝑉 ∀𝑏 ∈ 𝑉 ((𝐹‘𝑎)𝐷(𝐹‘𝑏)) ∈ ℝ) |
| 28 | f1ofn 6822 | . . . . . . . . 9 ⊢ (𝐹:𝑉–1-1-onto→𝐵 → 𝐹 Fn 𝑉) | |
| 29 | 3, 28 | syl 18 | . . . . . . . 8 ⊢ (𝜑 → 𝐹 Fn 𝑉) |
| 30 | oveq2 7424 | . . . . . . . . . 10 ⊢ (𝑦 = (𝐹‘𝑏) → ((𝐹‘𝑎)𝐷𝑦) = ((𝐹‘𝑎)𝐷(𝐹‘𝑏))) | |
| 31 | 30 | eleq1d 2847 | . . . . . . . . 9 ⊢ (𝑦 = (𝐹‘𝑏) → (((𝐹‘𝑎)𝐷𝑦) ∈ ℝ ↔ ((𝐹‘𝑎)𝐷(𝐹‘𝑏)) ∈ ℝ)) |
| 32 | 31 | ralrn 7084 | . . . . . . . 8 ⊢ (𝐹 Fn 𝑉 → (∀𝑦 ∈ ran 𝐹((𝐹‘𝑎)𝐷𝑦) ∈ ℝ ↔ ∀𝑏 ∈ 𝑉 ((𝐹‘𝑎)𝐷(𝐹‘𝑏)) ∈ ℝ)) |
| 33 | 29, 32 | syl 18 | . . . . . . 7 ⊢ (𝜑 → (∀𝑦 ∈ ran 𝐹((𝐹‘𝑎)𝐷𝑦) ∈ ℝ ↔ ∀𝑏 ∈ 𝑉 ((𝐹‘𝑎)𝐷(𝐹‘𝑏)) ∈ ℝ)) |
| 34 | forn 6796 | . . . . . . . . 9 ⊢ (𝐹:𝑉–onto→𝐵 → ran 𝐹 = 𝐵) | |
| 35 | 12, 34 | syl 18 | . . . . . . . 8 ⊢ (𝜑 → ran 𝐹 = 𝐵) |
| 36 | 35 | raleqdv 3321 | . . . . . . 7 ⊢ (𝜑 → (∀𝑦 ∈ ran 𝐹((𝐹‘𝑎)𝐷𝑦) ∈ ℝ ↔ ∀𝑦 ∈ 𝐵 ((𝐹‘𝑎)𝐷𝑦) ∈ ℝ)) |
| 37 | 33, 36 | bitr3d 284 | . . . . . 6 ⊢ (𝜑 → (∀𝑏 ∈ 𝑉 ((𝐹‘𝑎)𝐷(𝐹‘𝑏)) ∈ ℝ ↔ ∀𝑦 ∈ 𝐵 ((𝐹‘𝑎)𝐷𝑦) ∈ ℝ)) |
| 38 | 37 | ralbidv 3187 | . . . . 5 ⊢ (𝜑 → (∀𝑎 ∈ 𝑉 ∀𝑏 ∈ 𝑉 ((𝐹‘𝑎)𝐷(𝐹‘𝑏)) ∈ ℝ ↔ ∀𝑎 ∈ 𝑉 ∀𝑦 ∈ 𝐵 ((𝐹‘𝑎)𝐷𝑦) ∈ ℝ)) |
| 39 | 27, 38 | mpbid 235 | . . . 4 ⊢ (𝜑 → ∀𝑎 ∈ 𝑉 ∀𝑦 ∈ 𝐵 ((𝐹‘𝑎)𝐷𝑦) ∈ ℝ) |
| 40 | oveq1 7423 | . . . . . . . . 9 ⊢ (𝑥 = (𝐹‘𝑎) → (𝑥𝐷𝑦) = ((𝐹‘𝑎)𝐷𝑦)) | |
| 41 | 40 | eleq1d 2847 | . . . . . . . 8 ⊢ (𝑥 = (𝐹‘𝑎) → ((𝑥𝐷𝑦) ∈ ℝ ↔ ((𝐹‘𝑎)𝐷𝑦) ∈ ℝ)) |
| 42 | 41 | ralbidv 3187 | . . . . . . 7 ⊢ (𝑥 = (𝐹‘𝑎) → (∀𝑦 ∈ 𝐵 (𝑥𝐷𝑦) ∈ ℝ ↔ ∀𝑦 ∈ 𝐵 ((𝐹‘𝑎)𝐷𝑦) ∈ ℝ)) |
| 43 | 42 | ralrn 7084 | . . . . . 6 ⊢ (𝐹 Fn 𝑉 → (∀𝑥 ∈ ran 𝐹∀𝑦 ∈ 𝐵 (𝑥𝐷𝑦) ∈ ℝ ↔ ∀𝑎 ∈ 𝑉 ∀𝑦 ∈ 𝐵 ((𝐹‘𝑎)𝐷𝑦) ∈ ℝ)) |
| 44 | 29, 43 | syl 18 | . . . . 5 ⊢ (𝜑 → (∀𝑥 ∈ ran 𝐹∀𝑦 ∈ 𝐵 (𝑥𝐷𝑦) ∈ ℝ ↔ ∀𝑎 ∈ 𝑉 ∀𝑦 ∈ 𝐵 ((𝐹‘𝑎)𝐷𝑦) ∈ ℝ)) |
| 45 | 35 | raleqdv 3321 | . . . . 5 ⊢ (𝜑 → (∀𝑥 ∈ ran 𝐹∀𝑦 ∈ 𝐵 (𝑥𝐷𝑦) ∈ ℝ ↔ ∀𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 (𝑥𝐷𝑦) ∈ ℝ)) |
| 46 | 44, 45 | bitr3d 284 | . . . 4 ⊢ (𝜑 → (∀𝑎 ∈ 𝑉 ∀𝑦 ∈ 𝐵 ((𝐹‘𝑎)𝐷𝑦) ∈ ℝ ↔ ∀𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 (𝑥𝐷𝑦) ∈ ℝ)) |
| 47 | 39, 46 | mpbid 235 | . . 3 ⊢ (𝜑 → ∀𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 (𝑥𝐷𝑦) ∈ ℝ) |
| 48 | ffnov 7542 | . . 3 ⊢ (𝐷:(𝐵 × 𝐵)⟶ℝ ↔ (𝐷 Fn (𝐵 × 𝐵) ∧ ∀𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 (𝑥𝐷𝑦) ∈ ℝ)) | |
| 49 | 14, 47, 48 | sylanbrc 595 | . 2 ⊢ (𝜑 → 𝐷:(𝐵 × 𝐵)⟶ℝ) |
| 50 | ismet2 24560 | . 2 ⊢ (𝐷 ∈ (Met‘𝐵) ↔ (𝐷 ∈ (∞Met‘𝐵) ∧ 𝐷:(𝐵 × 𝐵)⟶ℝ)) | |
| 51 | 10, 49, 50 | sylanbrc 595 | 1 ⊢ (𝜑 → 𝐷 ∈ (Met‘𝐵)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 209 ∧ wa 401 = wceq 1570 ∈ wcel 2145 ∀wral 3078 × cxp 5657 ran crn 5660 ↾ cres 5661 Fn wfn 6532 ⟶wf 6533 –onto→wfo 6535 –1-1-onto→wf1o 6536 ‘cfv 6537 (class class class)co 7416 ℝcr 11126 Basecbs 17305 distcds 17355 “s cimas 17594 ∞Metcxmet 21571 Metcmet 21572 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2215 ax-ext 2734 ax-rep 5236 ax-sep 5255 ax-nul 5267 ax-pow 5334 ax-pr 5402 ax-un 7739 ax-cnex 11183 ax-resscn 11184 ax-1cn 11185 ax-icn 11186 ax-addcl 11187 ax-addrcl 11188 ax-mulcl 11189 ax-mulrcl 11190 ax-mulcom 11191 ax-addass 11192 ax-mulass 11193 ax-distr 11194 ax-i2m1 11195 ax-1ne0 11196 ax-1rid 11197 ax-rnegex 11198 ax-rrecex 11199 ax-cnre 11200 ax-pre-lttri 11201 ax-pre-lttrn 11202 ax-pre-ltadd 11203 ax-pre-mulgt0 11204 ax-pre-sup 11205 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2566 df-eu 2596 df-clab 2741 df-cleq 2754 df-clel 2837 df-nfc 2911 df-ne 2958 df-nel 3064 df-ral 3079 df-rex 3089 df-rmo 3367 df-reu 3368 df-rab 3415 df-v 3455 df-sbc 3743 df-csb 3851 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-pss 3922 df-nul 4283 df-if 4486 df-pw 4562 df-sn 4588 df-pr 4590 df-tp 4592 df-op 4594 df-uni 4871 df-int 4911 df-iun 4956 df-iin 4957 df-br 5108 df-opab 5172 df-mpt 5191 df-tr 5217 df-id 5554 df-eprel 5559 df-po 5567 df-so 5568 df-fr 5612 df-se 5613 df-we 5614 df-xp 5665 df-rel 5666 df-cnv 5667 df-co 5668 df-dm 5669 df-rn 5670 df-res 5671 df-ima 5672 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-isom 6546 df-riota 7373 df-ov 7419 df-oprab 7420 df-mpo 7421 df-of 7681 df-om 7866 df-1st 7989 df-2nd 7990 df-supp 8162 df-frecs 8283 df-wrecs 8314 df-recs 8363 df-rdg 8402 df-1o 8458 df-2o 8459 df-er 8699 df-map 8831 df-en 8956 df-dom 8957 df-sdom 8958 df-fin 8959 df-fsupp 9335 df-sup 9415 df-inf 9416 df-oi 9485 df-card 9947 df-pnf 11272 df-mnf 11273 df-xr 11274 df-ltxr 11275 df-le 11276 df-sub 11470 df-neg 11471 df-div 11899 df-nn 12261 df-2 12330 df-3 12331 df-4 12332 df-5 12333 df-6 12334 df-7 12335 df-8 12336 df-9 12337 df-n0 12532 df-z 12619 df-dec 12740 df-uz 12891 df-rp 13045 df-xneg 13165 df-xadd 13166 df-xmul 13167 df-fz 13564 df-fzo 13712 df-seq 14068 df-hash 14397 df-struct 17243 df-sets 17260 df-slot 17278 df-ndx 17290 df-base 17306 df-ress 17327 df-plusg 17359 df-mulr 17360 df-sca 17362 df-vsca 17363 df-ip 17364 df-tset 17365 df-ple 17366 df-ds 17368 df-0g 17530 df-gsum 17531 df-xrs 17592 df-imas 17598 df-mre 17674 df-mrc 17675 df-acs 17677 df-mgm 18734 df-sgrp 18823 df-mnd 18839 df-submnd 18893 df-mulg 19192 df-cntz 19445 df-cmn 19910 df-xmet 21579 df-met 21580 |
| This theorem is used by: xpsmet 24609 imasf1oms 24717 |
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