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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 2760 | . . 3 ⊢ (glb‘𝐼) = (glb‘𝐼) | |
| 2 | toplatmeet.m | . . 3 ⊢ ∧ = (meet‘𝐼) | |
| 3 | toplatmeet.i | . . . . 5 ⊢ 𝐼 = (toInc‘𝐽) | |
| 4 | 3 | ipopos 18671 | . . . 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 18524 | . 2 ⊢ (𝜑 → (𝐴 ∧ 𝐵) = ((glb‘𝐼)‘{𝐴, 𝐵})) |
| 9 | toplatmeet.j | . . 3 ⊢ (𝜑 → 𝐽 ∈ Top) | |
| 10 | 6, 7 | prssd 4782 | . . 3 ⊢ (𝜑 → {𝐴, 𝐵} ⊆ 𝐽) |
| 11 | 1 | a1i 11 | . . 3 ⊢ (𝜑 → (glb‘𝐼) = (glb‘𝐼)) |
| 12 | intprg 4940 | . . . . . . 7 ⊢ ((𝐴 ∈ 𝐽 ∧ 𝐵 ∈ 𝐽) → ∩ {𝐴, 𝐵} = (𝐴 ∩ 𝐵)) | |
| 13 | 6, 7, 12 | syl2anc 596 | . . . . . 6 ⊢ (𝜑 → ∩ {𝐴, 𝐵} = (𝐴 ∩ 𝐵)) |
| 14 | inopn 23178 | . . . . . . 7 ⊢ ((𝐽 ∈ Top ∧ 𝐴 ∈ 𝐽 ∧ 𝐵 ∈ 𝐽) → (𝐴 ∩ 𝐵) ∈ 𝐽) | |
| 15 | 9, 6, 7, 14 | syl3anc 1398 | . . . . . 6 ⊢ (𝜑 → (𝐴 ∩ 𝐵) ∈ 𝐽) |
| 16 | 13, 15 | eqeltrd 2860 | . . . . 5 ⊢ (𝜑 → ∩ {𝐴, 𝐵} ∈ 𝐽) |
| 17 | unimax 4904 | . . . . 5 ⊢ (∩ {𝐴, 𝐵} ∈ 𝐽 → ∪ {𝑥 ∈ 𝐽 ∣ 𝑥 ⊆ ∩ {𝐴, 𝐵}} = ∩ {𝐴, 𝐵}) | |
| 18 | 16, 17 | syl 18 | . . . 4 ⊢ (𝜑 → ∪ {𝑥 ∈ 𝐽 ∣ 𝑥 ⊆ ∩ {𝐴, 𝐵}} = ∩ {𝐴, 𝐵}) |
| 19 | 18, 13 | eqtr2d 2796 | . . 3 ⊢ (𝜑 → (𝐴 ∩ 𝐵) = ∪ {𝑥 ∈ 𝐽 ∣ 𝑥 ⊆ ∩ {𝐴, 𝐵}}) |
| 20 | 3, 9, 10, 11, 19, 15 | ipoglb 50021 | . 2 ⊢ (𝜑 → ((glb‘𝐼)‘{𝐴, 𝐵}) = (𝐴 ∩ 𝐵)) |
| 21 | 8, 20 | eqtrd 2795 | 1 ⊢ (𝜑 → (𝐴 ∧ 𝐵) = (𝐴 ∩ 𝐵)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 = wceq 1570 ∈ wcel 2145 {crab 3412 ∩ cin 3897 ⊆ wss 3898 {cpr 4585 ∪ cuni 4866 ∩ cint 4906 ‘cfv 6527 (class class class)co 7408 Posetcpo 18442 glbcglb 18445 meetcmee 18447 toInccipo 18662 Topctop 23172 |
| 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 5231 ax-sep 5248 ax-nul 5259 ax-pow 5326 ax-pr 5390 ax-un 7734 ax-cnex 11227 ax-resscn 11228 ax-1cn 11229 ax-icn 11230 ax-addcl 11231 ax-addrcl 11232 ax-mulcl 11233 ax-mulrcl 11234 ax-mulcom 11235 ax-addass 11236 ax-mulass 11237 ax-distr 11238 ax-i2m1 11239 ax-1ne0 11240 ax-1rid 11241 ax-rnegex 11242 ax-rrecex 11243 ax-cnre 11244 ax-pre-lttri 11245 ax-pre-lttrn 11246 ax-pre-ltadd 11247 ax-pre-mulgt0 11248 |
| 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-nel 3062 df-ral 3077 df-rex 3087 df-rmo 3365 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3739 df-csb 3847 df-dif 3901 df-un 3903 df-in 3905 df-ss 3915 df-pss 3918 df-nul 4279 df-if 4482 df-pw 4558 df-sn 4584 df-pr 4586 df-op 4590 df-uni 4867 df-int 4907 df-iun 4952 df-br 5103 df-opab 5167 df-mpt 5186 df-tr 5212 df-id 5542 df-eprel 5547 df-po 5555 df-so 5556 df-fr 5600 df-we 5602 df-xp 5653 df-rel 5654 df-cnv 5655 df-co 5656 df-dm 5657 df-rn 5658 df-res 5659 df-ima 5660 df-pred 6293 df-ord 6354 df-on 6355 df-lim 6356 df-suc 6357 df-iota 6483 df-fun 6529 df-fn 6530 df-f 6531 df-f1 6532 df-fo 6533 df-f1o 6534 df-fv 6535 df-riota 7365 df-ov 7411 df-oprab 7412 df-mpo 7413 df-om 7861 df-1st 7984 df-2nd 7985 df-frecs 8277 df-wrecs 8308 df-recs 8357 df-rdg 8396 df-1o 8454 df-er 8695 df-en 8952 df-dom 8953 df-sdom 8954 df-fin 8955 df-pnf 11316 df-mnf 11317 df-xr 11318 df-ltxr 11319 df-le 11320 df-sub 11514 df-neg 11515 df-nn 12305 df-2 12374 df-3 12375 df-4 12376 df-5 12377 df-6 12378 df-7 12379 df-8 12380 df-9 12381 df-n0 12576 df-z 12663 df-dec 12784 df-uz 12935 df-fz 13609 df-struct 17286 df-sets 17303 df-slot 17321 df-ndx 17333 df-base 17349 df-tset 17408 df-ple 17409 df-ocomp 17410 df-odu 18422 df-proset 18429 df-poset 18448 df-lub 18479 df-glb 18480 df-meet 18482 df-ipo 18663 df-top 23173 |
| This theorem is used by: topdlat 50034 |
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