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| Mirrors > Home > MPE Home > Th. List > Mathboxes > tosglb | Structured version Visualization version GIF version | ||
| Description: Same theorem as toslub 33413, for infinimum. (Contributed by Thierry Arnoux, 17-Feb-2018.) (Revised by AV, 28-Sep-2020.) |
| Ref | Expression |
|---|---|
| tosglb.b | ⊢ 𝐵 = (Base‘𝐾) |
| tosglb.l | ⊢ < = (lt‘𝐾) |
| tosglb.1 | ⊢ (𝜑 → 𝐾 ∈ Toset) |
| tosglb.2 | ⊢ (𝜑 → 𝐴 ⊆ 𝐵) |
| Ref | Expression |
|---|---|
| tosglb | ⊢ (𝜑 → ((glb‘𝐾)‘𝐴) = inf(𝐴, 𝐵, < )) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | tosglb.b | . . . . 5 ⊢ 𝐵 = (Base‘𝐾) | |
| 2 | tosglb.l | . . . . 5 ⊢ < = (lt‘𝐾) | |
| 3 | tosglb.1 | . . . . 5 ⊢ (𝜑 → 𝐾 ∈ Toset) | |
| 4 | tosglb.2 | . . . . 5 ⊢ (𝜑 → 𝐴 ⊆ 𝐵) | |
| 5 | eqid 2760 | . . . . 5 ⊢ (le‘𝐾) = (le‘𝐾) | |
| 6 | 1, 2, 3, 4, 5 | tosglblem 33414 | . . . 4 ⊢ ((𝜑 ∧ 𝑎 ∈ 𝐵) → ((∀𝑏 ∈ 𝐴 𝑎(le‘𝐾)𝑏 ∧ ∀𝑐 ∈ 𝐵 (∀𝑏 ∈ 𝐴 𝑐(le‘𝐾)𝑏 → 𝑐(le‘𝐾)𝑎)) ↔ (∀𝑏 ∈ 𝐴 ¬ 𝑎◡ < 𝑏 ∧ ∀𝑏 ∈ 𝐵 (𝑏◡ < 𝑎 → ∃𝑑 ∈ 𝐴 𝑏◡ < 𝑑)))) |
| 7 | 6 | riotabidva 7389 | . . 3 ⊢ (𝜑 → (℩𝑎 ∈ 𝐵 (∀𝑏 ∈ 𝐴 𝑎(le‘𝐾)𝑏 ∧ ∀𝑐 ∈ 𝐵 (∀𝑏 ∈ 𝐴 𝑐(le‘𝐾)𝑏 → 𝑐(le‘𝐾)𝑎))) = (℩𝑎 ∈ 𝐵 (∀𝑏 ∈ 𝐴 ¬ 𝑎◡ < 𝑏 ∧ ∀𝑏 ∈ 𝐵 (𝑏◡ < 𝑎 → ∃𝑑 ∈ 𝐴 𝑏◡ < 𝑑)))) |
| 8 | eqid 2760 | . . . 4 ⊢ (glb‘𝐾) = (glb‘𝐾) | |
| 9 | biid 264 | . . . 4 ⊢ ((∀𝑏 ∈ 𝐴 𝑎(le‘𝐾)𝑏 ∧ ∀𝑐 ∈ 𝐵 (∀𝑏 ∈ 𝐴 𝑐(le‘𝐾)𝑏 → 𝑐(le‘𝐾)𝑎)) ↔ (∀𝑏 ∈ 𝐴 𝑎(le‘𝐾)𝑏 ∧ ∀𝑐 ∈ 𝐵 (∀𝑏 ∈ 𝐴 𝑐(le‘𝐾)𝑏 → 𝑐(le‘𝐾)𝑎))) | |
| 10 | 1, 5, 8, 9, 3, 4 | glbval 18455 | . . 3 ⊢ (𝜑 → ((glb‘𝐾)‘𝐴) = (℩𝑎 ∈ 𝐵 (∀𝑏 ∈ 𝐴 𝑎(le‘𝐾)𝑏 ∧ ∀𝑐 ∈ 𝐵 (∀𝑏 ∈ 𝐴 𝑐(le‘𝐾)𝑏 → 𝑐(le‘𝐾)𝑎)))) |
| 11 | 1, 5, 2 | tosso 18505 | . . . . . . 7 ⊢ (𝐾 ∈ Toset → (𝐾 ∈ Toset ↔ ( < Or 𝐵 ∧ ( I ↾ 𝐵) ⊆ (le‘𝐾)))) |
| 12 | 11 | ibi 270 | . . . . . 6 ⊢ (𝐾 ∈ Toset → ( < Or 𝐵 ∧ ( I ↾ 𝐵) ⊆ (le‘𝐾))) |
| 13 | 12 | simpld 500 | . . . . 5 ⊢ (𝐾 ∈ Toset → < Or 𝐵) |
| 14 | cnvso 6286 | . . . . 5 ⊢ ( < Or 𝐵 ↔ ◡ < Or 𝐵) | |
| 15 | 13, 14 | sylib 221 | . . . 4 ⊢ (𝐾 ∈ Toset → ◡ < Or 𝐵) |
| 16 | id 23 | . . . . 5 ⊢ (◡ < Or 𝐵 → ◡ < Or 𝐵) | |
| 17 | 16 | supval2 9425 | . . . 4 ⊢ (◡ < Or 𝐵 → sup(𝐴, 𝐵, ◡ < ) = (℩𝑎 ∈ 𝐵 (∀𝑏 ∈ 𝐴 ¬ 𝑎◡ < 𝑏 ∧ ∀𝑏 ∈ 𝐵 (𝑏◡ < 𝑎 → ∃𝑑 ∈ 𝐴 𝑏◡ < 𝑑)))) |
| 18 | 3, 15, 17 | 3syl 19 | . . 3 ⊢ (𝜑 → sup(𝐴, 𝐵, ◡ < ) = (℩𝑎 ∈ 𝐵 (∀𝑏 ∈ 𝐴 ¬ 𝑎◡ < 𝑏 ∧ ∀𝑏 ∈ 𝐵 (𝑏◡ < 𝑎 → ∃𝑑 ∈ 𝐴 𝑏◡ < 𝑑)))) |
| 19 | 7, 10, 18 | 3eqtr4d 2805 | . 2 ⊢ (𝜑 → ((glb‘𝐾)‘𝐴) = sup(𝐴, 𝐵, ◡ < )) |
| 20 | df-inf 9413 | . . . 4 ⊢ inf(𝐴, 𝐵, < ) = sup(𝐴, 𝐵, ◡ < ) | |
| 21 | 20 | eqcomi 2769 | . . 3 ⊢ sup(𝐴, 𝐵, ◡ < ) = inf(𝐴, 𝐵, < ) |
| 22 | 21 | a1i 11 | . 2 ⊢ (𝜑 → sup(𝐴, 𝐵, ◡ < ) = inf(𝐴, 𝐵, < )) |
| 23 | 19, 22 | eqtrd 2795 | 1 ⊢ (𝜑 → ((glb‘𝐾)‘𝐴) = inf(𝐴, 𝐵, < )) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ¬ wn 3 → wi 4 ∧ wa 401 = wceq 1570 ∈ wcel 2145 ∀wral 3076 ∃wrex 3086 ⊆ wss 3899 class class class wbr 5103 I cid 5549 Or wor 5562 ◡ccnv 5654 ↾ cres 5657 ‘cfv 6533 ℩crio 7369 supcsup 9410 infcinf 9411 Basecbs 17301 lecple 17349 ltcplt 18396 glbcglb 18398 Tosetctos 18502 |
| 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 2213 ax-ext 2732 ax-rep 5232 ax-sep 5251 ax-nul 5263 ax-pow 5330 ax-pr 5398 |
| 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 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-ral 3077 df-rex 3087 df-rmo 3365 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3740 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-nul 4280 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-iun 4953 df-br 5104 df-opab 5168 df-mpt 5187 df-id 5550 df-po 5563 df-so 5564 df-xp 5661 df-rel 5662 df-cnv 5663 df-co 5664 df-dm 5665 df-rn 5666 df-res 5667 df-ima 5668 df-iota 6489 df-fun 6535 df-fn 6536 df-f 6537 df-f1 6538 df-fo 6539 df-f1o 6540 df-fv 6541 df-riota 7370 df-sup 9412 df-inf 9413 df-proset 18382 df-poset 18401 df-plt 18416 df-glb 18433 df-toset 18503 |
| This theorem is used by: xrsp0 33452 |
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