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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 2731 | . . 3 ⊢ (glb‘𝐼) = (glb‘𝐼) | |
| 2 | toplatmeet.m | . . 3 ⊢ ∧ = (meet‘𝐼) | |
| 3 | toplatmeet.i | . . . . 5 ⊢ 𝐼 = (toInc‘𝐽) | |
| 4 | 3 | ipopos 18448 | . . . 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 18301 | . 2 ⊢ (𝜑 → (𝐴 ∧ 𝐵) = ((glb‘𝐼)‘{𝐴, 𝐵})) |
| 9 | toplatmeet.j | . . 3 ⊢ (𝜑 → 𝐽 ∈ Top) | |
| 10 | 6, 7 | prssd 4773 | . . 3 ⊢ (𝜑 → {𝐴, 𝐵} ⊆ 𝐽) |
| 11 | 1 | a1i 11 | . . 3 ⊢ (𝜑 → (glb‘𝐼) = (glb‘𝐼)) |
| 12 | intprg 4931 | . . . . . . 7 ⊢ ((𝐴 ∈ 𝐽 ∧ 𝐵 ∈ 𝐽) → ∩ {𝐴, 𝐵} = (𝐴 ∩ 𝐵)) | |
| 13 | 6, 7, 12 | syl2anc 584 | . . . . . 6 ⊢ (𝜑 → ∩ {𝐴, 𝐵} = (𝐴 ∩ 𝐵)) |
| 14 | inopn 22820 | . . . . . . 7 ⊢ ((𝐽 ∈ Top ∧ 𝐴 ∈ 𝐽 ∧ 𝐵 ∈ 𝐽) → (𝐴 ∩ 𝐵) ∈ 𝐽) | |
| 15 | 9, 6, 7, 14 | syl3anc 1373 | . . . . . 6 ⊢ (𝜑 → (𝐴 ∩ 𝐵) ∈ 𝐽) |
| 16 | 13, 15 | eqeltrd 2831 | . . . . 5 ⊢ (𝜑 → ∩ {𝐴, 𝐵} ∈ 𝐽) |
| 17 | unimax 4895 | . . . . 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 2767 | . . 3 ⊢ (𝜑 → (𝐴 ∩ 𝐵) = ∪ {𝑥 ∈ 𝐽 ∣ 𝑥 ⊆ ∩ {𝐴, 𝐵}}) |
| 20 | 3, 9, 10, 11, 19, 15 | ipoglb 49096 | . 2 ⊢ (𝜑 → ((glb‘𝐼)‘{𝐴, 𝐵}) = (𝐴 ∩ 𝐵)) |
| 21 | 8, 20 | eqtrd 2766 | 1 ⊢ (𝜑 → (𝐴 ∧ 𝐵) = (𝐴 ∩ 𝐵)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 = wceq 1541 ∈ wcel 2111 {crab 3395 ∩ cin 3896 ⊆ wss 3897 {cpr 4577 ∪ cuni 4858 ∩ cint 4897 ‘cfv 6487 (class class class)co 7352 Posetcpo 18219 glbcglb 18222 meetcmee 18224 toInccipo 18439 Topctop 22814 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2113 ax-9 2121 ax-10 2144 ax-11 2160 ax-12 2180 ax-ext 2703 ax-rep 5219 ax-sep 5236 ax-nul 5246 ax-pow 5305 ax-pr 5372 ax-un 7674 ax-cnex 11068 ax-resscn 11069 ax-1cn 11070 ax-icn 11071 ax-addcl 11072 ax-addrcl 11073 ax-mulcl 11074 ax-mulrcl 11075 ax-mulcom 11076 ax-addass 11077 ax-mulass 11078 ax-distr 11079 ax-i2m1 11080 ax-1ne0 11081 ax-1rid 11082 ax-rnegex 11083 ax-rrecex 11084 ax-cnre 11085 ax-pre-lttri 11086 ax-pre-lttrn 11087 ax-pre-ltadd 11088 ax-pre-mulgt0 11089 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2535 df-eu 2564 df-clab 2710 df-cleq 2723 df-clel 2806 df-nfc 2881 df-ne 2929 df-nel 3033 df-ral 3048 df-rex 3057 df-rmo 3346 df-reu 3347 df-rab 3396 df-v 3438 df-sbc 3737 df-csb 3846 df-dif 3900 df-un 3902 df-in 3904 df-ss 3914 df-pss 3917 df-nul 4283 df-if 4475 df-pw 4551 df-sn 4576 df-pr 4578 df-op 4582 df-uni 4859 df-int 4898 df-iun 4943 df-br 5094 df-opab 5156 df-mpt 5175 df-tr 5201 df-id 5514 df-eprel 5519 df-po 5527 df-so 5528 df-fr 5572 df-we 5574 df-xp 5625 df-rel 5626 df-cnv 5627 df-co 5628 df-dm 5629 df-rn 5630 df-res 5631 df-ima 5632 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 7309 df-ov 7355 df-oprab 7356 df-mpo 7357 df-om 7803 df-1st 7927 df-2nd 7928 df-frecs 8217 df-wrecs 8248 df-recs 8297 df-rdg 8335 df-1o 8391 df-er 8628 df-en 8876 df-dom 8877 df-sdom 8878 df-fin 8879 df-pnf 11154 df-mnf 11155 df-xr 11156 df-ltxr 11157 df-le 11158 df-sub 11352 df-neg 11353 df-nn 12132 df-2 12194 df-3 12195 df-4 12196 df-5 12197 df-6 12198 df-7 12199 df-8 12200 df-9 12201 df-n0 12388 df-z 12475 df-dec 12595 df-uz 12739 df-fz 13414 df-struct 17064 df-sets 17081 df-slot 17099 df-ndx 17111 df-base 17127 df-tset 17186 df-ple 17187 df-ocomp 17188 df-odu 18199 df-proset 18206 df-poset 18225 df-lub 18256 df-glb 18257 df-meet 18259 df-ipo 18440 df-top 22815 |
| This theorem is referenced by: topdlat 49109 |
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