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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 2736 | . . 3 ⊢ (glb‘𝐼) = (glb‘𝐼) | |
2 | toplatmeet.m | . . 3 ⊢ ∧ = (meet‘𝐼) | |
3 | toplatmeet.i | . . . . 5 ⊢ 𝐼 = (toInc‘𝐽) | |
4 | 3 | ipopos 18343 | . . . 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 18198 | . 2 ⊢ (𝜑 → (𝐴 ∧ 𝐵) = ((glb‘𝐼)‘{𝐴, 𝐵})) |
9 | toplatmeet.j | . . 3 ⊢ (𝜑 → 𝐽 ∈ Top) | |
10 | 6, 7 | prssd 4768 | . . 3 ⊢ (𝜑 → {𝐴, 𝐵} ⊆ 𝐽) |
11 | 1 | a1i 11 | . . 3 ⊢ (𝜑 → (glb‘𝐼) = (glb‘𝐼)) |
12 | intprg 4926 | . . . . . . 7 ⊢ ((𝐴 ∈ 𝐽 ∧ 𝐵 ∈ 𝐽) → ∩ {𝐴, 𝐵} = (𝐴 ∩ 𝐵)) | |
13 | 6, 7, 12 | syl2anc 584 | . . . . . 6 ⊢ (𝜑 → ∩ {𝐴, 𝐵} = (𝐴 ∩ 𝐵)) |
14 | inopn 22146 | . . . . . . 7 ⊢ ((𝐽 ∈ Top ∧ 𝐴 ∈ 𝐽 ∧ 𝐵 ∈ 𝐽) → (𝐴 ∩ 𝐵) ∈ 𝐽) | |
15 | 9, 6, 7, 14 | syl3anc 1370 | . . . . . 6 ⊢ (𝜑 → (𝐴 ∩ 𝐵) ∈ 𝐽) |
16 | 13, 15 | eqeltrd 2837 | . . . . 5 ⊢ (𝜑 → ∩ {𝐴, 𝐵} ∈ 𝐽) |
17 | unimax 4891 | . . . . 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 2777 | . . 3 ⊢ (𝜑 → (𝐴 ∩ 𝐵) = ∪ {𝑥 ∈ 𝐽 ∣ 𝑥 ⊆ ∩ {𝐴, 𝐵}}) |
20 | 3, 9, 10, 11, 19, 15 | ipoglb 46617 | . 2 ⊢ (𝜑 → ((glb‘𝐼)‘{𝐴, 𝐵}) = (𝐴 ∩ 𝐵)) |
21 | 8, 20 | eqtrd 2776 | 1 ⊢ (𝜑 → (𝐴 ∧ 𝐵) = (𝐴 ∩ 𝐵)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1540 ∈ wcel 2105 {crab 3403 ∩ cin 3896 ⊆ wss 3897 {cpr 4574 ∪ cuni 4851 ∩ cint 4893 ‘cfv 6473 (class class class)co 7329 Posetcpo 18114 glbcglb 18117 meetcmee 18119 toInccipo 18334 Topctop 22140 |
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 1912 ax-6 1970 ax-7 2010 ax-8 2107 ax-9 2115 ax-10 2136 ax-11 2153 ax-12 2170 ax-ext 2707 ax-rep 5226 ax-sep 5240 ax-nul 5247 ax-pow 5305 ax-pr 5369 ax-un 7642 ax-cnex 11020 ax-resscn 11021 ax-1cn 11022 ax-icn 11023 ax-addcl 11024 ax-addrcl 11025 ax-mulcl 11026 ax-mulrcl 11027 ax-mulcom 11028 ax-addass 11029 ax-mulass 11030 ax-distr 11031 ax-i2m1 11032 ax-1ne0 11033 ax-1rid 11034 ax-rnegex 11035 ax-rrecex 11036 ax-cnre 11037 ax-pre-lttri 11038 ax-pre-lttrn 11039 ax-pre-ltadd 11040 ax-pre-mulgt0 11041 |
This theorem depends on definitions: df-bi 206 df-an 397 df-or 845 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1781 df-nf 1785 df-sb 2067 df-mo 2538 df-eu 2567 df-clab 2714 df-cleq 2728 df-clel 2814 df-nfc 2886 df-ne 2941 df-nel 3047 df-ral 3062 df-rex 3071 df-rmo 3349 df-reu 3350 df-rab 3404 df-v 3443 df-sbc 3727 df-csb 3843 df-dif 3900 df-un 3902 df-in 3904 df-ss 3914 df-pss 3916 df-nul 4269 df-if 4473 df-pw 4548 df-sn 4573 df-pr 4575 df-op 4579 df-uni 4852 df-int 4894 df-iun 4940 df-br 5090 df-opab 5152 df-mpt 5173 df-tr 5207 df-id 5512 df-eprel 5518 df-po 5526 df-so 5527 df-fr 5569 df-we 5571 df-xp 5620 df-rel 5621 df-cnv 5622 df-co 5623 df-dm 5624 df-rn 5625 df-res 5626 df-ima 5627 df-pred 6232 df-ord 6299 df-on 6300 df-lim 6301 df-suc 6302 df-iota 6425 df-fun 6475 df-fn 6476 df-f 6477 df-f1 6478 df-fo 6479 df-f1o 6480 df-fv 6481 df-riota 7286 df-ov 7332 df-oprab 7333 df-mpo 7334 df-om 7773 df-1st 7891 df-2nd 7892 df-frecs 8159 df-wrecs 8190 df-recs 8264 df-rdg 8303 df-1o 8359 df-er 8561 df-en 8797 df-dom 8798 df-sdom 8799 df-fin 8800 df-pnf 11104 df-mnf 11105 df-xr 11106 df-ltxr 11107 df-le 11108 df-sub 11300 df-neg 11301 df-nn 12067 df-2 12129 df-3 12130 df-4 12131 df-5 12132 df-6 12133 df-7 12134 df-8 12135 df-9 12136 df-n0 12327 df-z 12413 df-dec 12531 df-uz 12676 df-fz 13333 df-struct 16937 df-sets 16954 df-slot 16972 df-ndx 16984 df-base 17002 df-tset 17070 df-ple 17071 df-ocomp 17072 df-odu 18094 df-proset 18102 df-poset 18120 df-lub 18153 df-glb 18154 df-meet 18156 df-ipo 18335 df-top 22141 |
This theorem is referenced by: topdlat 46630 |
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