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| Mirrors > Home > MPE Home > Th. List > Mathboxes > toplatmeet | Structured version Visualization version GIF version | ||
| Description: Meets in a topology are realized by intersections. (Contributed by Zhi Wang, 30-Sep-2024.) |
| Ref | Expression |
|---|---|
| toplatmeet.i | ⊢ 𝐼 = (toInc‘𝐽) |
| toplatmeet.j | ⊢ (𝜑 → 𝐽 ∈ Top) |
| toplatmeet.a | ⊢ (𝜑 → 𝐴 ∈ 𝐽) |
| toplatmeet.b | ⊢ (𝜑 → 𝐵 ∈ 𝐽) |
| toplatmeet.m | ⊢ ∧ = (meet‘𝐼) |
| Ref | Expression |
|---|---|
| toplatmeet | ⊢ (𝜑 → (𝐴 ∧ 𝐵) = (𝐴 ∩ 𝐵)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqid 2735 | . . 3 ⊢ (glb‘𝐼) = (glb‘𝐼) | |
| 2 | toplatmeet.m | . . 3 ⊢ ∧ = (meet‘𝐼) | |
| 3 | toplatmeet.i | . . . . 5 ⊢ 𝐼 = (toInc‘𝐽) | |
| 4 | 3 | ipopos 18491 | . . . 4 ⊢ 𝐼 ∈ Poset |
| 5 | 4 | a1i 11 | . . 3 ⊢ (𝜑 → 𝐼 ∈ Poset) |
| 6 | toplatmeet.a | . . 3 ⊢ (𝜑 → 𝐴 ∈ 𝐽) | |
| 7 | toplatmeet.b | . . 3 ⊢ (𝜑 → 𝐵 ∈ 𝐽) | |
| 8 | 1, 2, 5, 6, 7 | meetval 18344 | . 2 ⊢ (𝜑 → (𝐴 ∧ 𝐵) = ((glb‘𝐼)‘{𝐴, 𝐵})) |
| 9 | toplatmeet.j | . . 3 ⊢ (𝜑 → 𝐽 ∈ Top) | |
| 10 | 6, 7 | prssd 4755 | . . 3 ⊢ (𝜑 → {𝐴, 𝐵} ⊆ 𝐽) |
| 11 | 1 | a1i 11 | . . 3 ⊢ (𝜑 → (glb‘𝐼) = (glb‘𝐼)) |
| 12 | intprg 4913 | . . . . . . 7 ⊢ ((𝐴 ∈ 𝐽 ∧ 𝐵 ∈ 𝐽) → ∩ {𝐴, 𝐵} = (𝐴 ∩ 𝐵)) | |
| 13 | 6, 7, 12 | syl2anc 585 | . . . . . 6 ⊢ (𝜑 → ∩ {𝐴, 𝐵} = (𝐴 ∩ 𝐵)) |
| 14 | inopn 22852 | . . . . . . 7 ⊢ ((𝐽 ∈ Top ∧ 𝐴 ∈ 𝐽 ∧ 𝐵 ∈ 𝐽) → (𝐴 ∩ 𝐵) ∈ 𝐽) | |
| 15 | 9, 6, 7, 14 | syl3anc 1374 | . . . . . 6 ⊢ (𝜑 → (𝐴 ∩ 𝐵) ∈ 𝐽) |
| 16 | 13, 15 | eqeltrd 2835 | . . . . 5 ⊢ (𝜑 → ∩ {𝐴, 𝐵} ∈ 𝐽) |
| 17 | unimax 4877 | . . . . 5 ⊢ (∩ {𝐴, 𝐵} ∈ 𝐽 → ∪ {𝑥 ∈ 𝐽 ∣ 𝑥 ⊆ ∩ {𝐴, 𝐵}} = ∩ {𝐴, 𝐵}) | |
| 18 | 16, 17 | syl 17 | . . . 4 ⊢ (𝜑 → ∪ {𝑥 ∈ 𝐽 ∣ 𝑥 ⊆ ∩ {𝐴, 𝐵}} = ∩ {𝐴, 𝐵}) |
| 19 | 18, 13 | eqtr2d 2771 | . . 3 ⊢ (𝜑 → (𝐴 ∩ 𝐵) = ∪ {𝑥 ∈ 𝐽 ∣ 𝑥 ⊆ ∩ {𝐴, 𝐵}}) |
| 20 | 3, 9, 10, 11, 19, 15 | ipoglb 49454 | . 2 ⊢ (𝜑 → ((glb‘𝐼)‘{𝐴, 𝐵}) = (𝐴 ∩ 𝐵)) |
| 21 | 8, 20 | eqtrd 2770 | 1 ⊢ (𝜑 → (𝐴 ∧ 𝐵) = (𝐴 ∩ 𝐵)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 = wceq 1542 ∈ wcel 2114 {crab 3387 ∩ cin 3884 ⊆ wss 3885 {cpr 4559 ∪ cuni 4840 ∩ cint 4879 ‘cfv 6487 (class class class)co 7356 Posetcpo 18262 glbcglb 18265 meetcmee 18267 toInccipo 18482 Topctop 22846 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2184 ax-ext 2707 ax-rep 5201 ax-sep 5220 ax-nul 5230 ax-pow 5296 ax-pr 5364 ax-un 7678 ax-cnex 11083 ax-resscn 11084 ax-1cn 11085 ax-icn 11086 ax-addcl 11087 ax-addrcl 11088 ax-mulcl 11089 ax-mulrcl 11090 ax-mulcom 11091 ax-addass 11092 ax-mulass 11093 ax-distr 11094 ax-i2m1 11095 ax-1ne0 11096 ax-1rid 11097 ax-rnegex 11098 ax-rrecex 11099 ax-cnre 11100 ax-pre-lttri 11101 ax-pre-lttrn 11102 ax-pre-ltadd 11103 ax-pre-mulgt0 11104 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2538 df-eu 2568 df-clab 2714 df-cleq 2727 df-clel 2810 df-nfc 2884 df-ne 2931 df-nel 3035 df-ral 3050 df-rex 3060 df-rmo 3340 df-reu 3341 df-rab 3388 df-v 3429 df-sbc 3726 df-csb 3834 df-dif 3888 df-un 3890 df-in 3892 df-ss 3902 df-pss 3905 df-nul 4264 df-if 4457 df-pw 4533 df-sn 4558 df-pr 4560 df-op 4564 df-uni 4841 df-int 4880 df-iun 4925 df-br 5075 df-opab 5137 df-mpt 5156 df-tr 5182 df-id 5515 df-eprel 5520 df-po 5528 df-so 5529 df-fr 5573 df-we 5575 df-xp 5626 df-rel 5627 df-cnv 5628 df-co 5629 df-dm 5630 df-rn 5631 df-res 5632 df-ima 5633 df-pred 6254 df-ord 6315 df-on 6316 df-lim 6317 df-suc 6318 df-iota 6443 df-fun 6489 df-fn 6490 df-f 6491 df-f1 6492 df-fo 6493 df-f1o 6494 df-fv 6495 df-riota 7313 df-ov 7359 df-oprab 7360 df-mpo 7361 df-om 7807 df-1st 7931 df-2nd 7932 df-frecs 8220 df-wrecs 8251 df-recs 8300 df-rdg 8338 df-1o 8394 df-er 8632 df-en 8883 df-dom 8884 df-sdom 8885 df-fin 8886 df-pnf 11170 df-mnf 11171 df-xr 11172 df-ltxr 11173 df-le 11174 df-sub 11368 df-neg 11369 df-nn 12164 df-2 12233 df-3 12234 df-4 12235 df-5 12236 df-6 12237 df-7 12238 df-8 12239 df-9 12240 df-n0 12427 df-z 12514 df-dec 12634 df-uz 12778 df-fz 13451 df-struct 17106 df-sets 17123 df-slot 17141 df-ndx 17153 df-base 17169 df-tset 17228 df-ple 17229 df-ocomp 17230 df-odu 18242 df-proset 18249 df-poset 18268 df-lub 18299 df-glb 18300 df-meet 18302 df-ipo 18483 df-top 22847 |
| This theorem is referenced by: topdlat 49467 |
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