| Mathbox for Zhi Wang |
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| Mirrors > Home > MPE Home > Th. List > Mathboxes > ipolub00 | Structured version Visualization version GIF version | ||
| Description: The LUB of the empty set is the empty set if it is contained. (Contributed by Zhi Wang, 30-Sep-2024.) |
| Ref | Expression |
|---|---|
| ipoglb0.i | ⊢ 𝐼 = (toInc‘𝐹) |
| ipolub00.u | ⊢ (𝜑 → 𝑈 = (lub‘𝐼)) |
| ipolub00.f | ⊢ (𝜑 → ∅ ∈ 𝐹) |
| Ref | Expression |
|---|---|
| ipolub00 | ⊢ (𝜑 → (𝑈‘∅) = ∅) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ipoglb0.i | . . . 4 ⊢ 𝐼 = (toInc‘𝐹) | |
| 2 | ipolub00.u | . . . . 5 ⊢ (𝜑 → 𝑈 = (lub‘𝐼)) | |
| 3 | 2 | adantr 480 | . . . 4 ⊢ ((𝜑 ∧ 𝐹 ∈ V) → 𝑈 = (lub‘𝐼)) |
| 4 | ipolub00.f | . . . . . . 7 ⊢ (𝜑 → ∅ ∈ 𝐹) | |
| 5 | int0el 4927 | . . . . . . 7 ⊢ (∅ ∈ 𝐹 → ∩ 𝐹 = ∅) | |
| 6 | 4, 5 | syl 17 | . . . . . 6 ⊢ (𝜑 → ∩ 𝐹 = ∅) |
| 7 | 6, 4 | eqeltrd 2831 | . . . . 5 ⊢ (𝜑 → ∩ 𝐹 ∈ 𝐹) |
| 8 | 7 | adantr 480 | . . . 4 ⊢ ((𝜑 ∧ 𝐹 ∈ V) → ∩ 𝐹 ∈ 𝐹) |
| 9 | simpr 484 | . . . 4 ⊢ ((𝜑 ∧ 𝐹 ∈ V) → 𝐹 ∈ V) | |
| 10 | 1, 3, 8, 9 | ipolub0 49102 | . . 3 ⊢ ((𝜑 ∧ 𝐹 ∈ V) → (𝑈‘∅) = ∩ 𝐹) |
| 11 | 6 | adantr 480 | . . 3 ⊢ ((𝜑 ∧ 𝐹 ∈ V) → ∩ 𝐹 = ∅) |
| 12 | 10, 11 | eqtrd 2766 | . 2 ⊢ ((𝜑 ∧ 𝐹 ∈ V) → (𝑈‘∅) = ∅) |
| 13 | 2 | adantr 480 | . . . . 5 ⊢ ((𝜑 ∧ ¬ 𝐹 ∈ V) → 𝑈 = (lub‘𝐼)) |
| 14 | fvprc 6814 | . . . . . . . 8 ⊢ (¬ 𝐹 ∈ V → (toInc‘𝐹) = ∅) | |
| 15 | 14 | adantl 481 | . . . . . . 7 ⊢ ((𝜑 ∧ ¬ 𝐹 ∈ V) → (toInc‘𝐹) = ∅) |
| 16 | 1, 15 | eqtrid 2778 | . . . . . 6 ⊢ ((𝜑 ∧ ¬ 𝐹 ∈ V) → 𝐼 = ∅) |
| 17 | 16 | fveq2d 6826 | . . . . 5 ⊢ ((𝜑 ∧ ¬ 𝐹 ∈ V) → (lub‘𝐼) = (lub‘∅)) |
| 18 | 13, 17 | eqtrd 2766 | . . . 4 ⊢ ((𝜑 ∧ ¬ 𝐹 ∈ V) → 𝑈 = (lub‘∅)) |
| 19 | 18 | fveq1d 6824 | . . 3 ⊢ ((𝜑 ∧ ¬ 𝐹 ∈ V) → (𝑈‘∅) = ((lub‘∅)‘∅)) |
| 20 | rex0 4307 | . . . . . 6 ⊢ ¬ ∃𝑥 ∈ ∅ (∀𝑦 ∈ ∅ 𝑦(le‘∅)𝑥 ∧ ∀𝑧 ∈ ∅ (∀𝑦 ∈ ∅ 𝑦(le‘∅)𝑧 → 𝑥(le‘∅)𝑧)) | |
| 21 | 20 | intnan 486 | . . . . 5 ⊢ ¬ (∅ ⊆ ∅ ∧ ∃𝑥 ∈ ∅ (∀𝑦 ∈ ∅ 𝑦(le‘∅)𝑥 ∧ ∀𝑧 ∈ ∅ (∀𝑦 ∈ ∅ 𝑦(le‘∅)𝑧 → 𝑥(le‘∅)𝑧))) |
| 22 | base0 17125 | . . . . . 6 ⊢ ∅ = (Base‘∅) | |
| 23 | eqid 2731 | . . . . . 6 ⊢ (le‘∅) = (le‘∅) | |
| 24 | eqid 2731 | . . . . . 6 ⊢ (lub‘∅) = (lub‘∅) | |
| 25 | biid 261 | . . . . . 6 ⊢ ((∀𝑦 ∈ ∅ 𝑦(le‘∅)𝑥 ∧ ∀𝑧 ∈ ∅ (∀𝑦 ∈ ∅ 𝑦(le‘∅)𝑧 → 𝑥(le‘∅)𝑧)) ↔ (∀𝑦 ∈ ∅ 𝑦(le‘∅)𝑥 ∧ ∀𝑧 ∈ ∅ (∀𝑦 ∈ ∅ 𝑦(le‘∅)𝑧 → 𝑥(le‘∅)𝑧))) | |
| 26 | 0pos 18227 | . . . . . . 7 ⊢ ∅ ∈ Poset | |
| 27 | 26 | a1i 11 | . . . . . 6 ⊢ ((𝜑 ∧ ¬ 𝐹 ∈ V) → ∅ ∈ Poset) |
| 28 | 22, 23, 24, 25, 27 | lubeldm2 49066 | . . . . 5 ⊢ ((𝜑 ∧ ¬ 𝐹 ∈ V) → (∅ ∈ dom (lub‘∅) ↔ (∅ ⊆ ∅ ∧ ∃𝑥 ∈ ∅ (∀𝑦 ∈ ∅ 𝑦(le‘∅)𝑥 ∧ ∀𝑧 ∈ ∅ (∀𝑦 ∈ ∅ 𝑦(le‘∅)𝑧 → 𝑥(le‘∅)𝑧))))) |
| 29 | 21, 28 | mtbiri 327 | . . . 4 ⊢ ((𝜑 ∧ ¬ 𝐹 ∈ V) → ¬ ∅ ∈ dom (lub‘∅)) |
| 30 | ndmfv 6854 | . . . 4 ⊢ (¬ ∅ ∈ dom (lub‘∅) → ((lub‘∅)‘∅) = ∅) | |
| 31 | 29, 30 | syl 17 | . . 3 ⊢ ((𝜑 ∧ ¬ 𝐹 ∈ V) → ((lub‘∅)‘∅) = ∅) |
| 32 | 19, 31 | eqtrd 2766 | . 2 ⊢ ((𝜑 ∧ ¬ 𝐹 ∈ V) → (𝑈‘∅) = ∅) |
| 33 | 12, 32 | pm2.61dan 812 | 1 ⊢ (𝜑 → (𝑈‘∅) = ∅) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 ∧ wa 395 = wceq 1541 ∈ wcel 2111 ∀wral 3047 ∃wrex 3056 Vcvv 3436 ⊆ wss 3897 ∅c0 4280 ∩ cint 4895 class class class wbr 5089 dom cdm 5614 ‘cfv 6481 lecple 17168 Posetcpo 18213 lubclub 18215 toInccipo 18433 |
| 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 5215 ax-sep 5232 ax-nul 5242 ax-pow 5301 ax-pr 5368 ax-un 7668 ax-cnex 11062 ax-resscn 11063 ax-1cn 11064 ax-icn 11065 ax-addcl 11066 ax-addrcl 11067 ax-mulcl 11068 ax-mulrcl 11069 ax-mulcom 11070 ax-addass 11071 ax-mulass 11072 ax-distr 11073 ax-i2m1 11074 ax-1ne0 11075 ax-1rid 11076 ax-rnegex 11077 ax-rrecex 11078 ax-cnre 11079 ax-pre-lttri 11080 ax-pre-lttrn 11081 ax-pre-ltadd 11082 ax-pre-mulgt0 11083 |
| 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 4281 df-if 4473 df-pw 4549 df-sn 4574 df-pr 4576 df-op 4580 df-uni 4857 df-int 4896 df-iun 4941 df-br 5090 df-opab 5152 df-mpt 5171 df-tr 5197 df-id 5509 df-eprel 5514 df-po 5522 df-so 5523 df-fr 5567 df-we 5569 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 6248 df-ord 6309 df-on 6310 df-lim 6311 df-suc 6312 df-iota 6437 df-fun 6483 df-fn 6484 df-f 6485 df-f1 6486 df-fo 6487 df-f1o 6488 df-fv 6489 df-riota 7303 df-ov 7349 df-oprab 7350 df-mpo 7351 df-om 7797 df-1st 7921 df-2nd 7922 df-frecs 8211 df-wrecs 8242 df-recs 8291 df-rdg 8329 df-1o 8385 df-er 8622 df-en 8870 df-dom 8871 df-sdom 8872 df-fin 8873 df-pnf 11148 df-mnf 11149 df-xr 11150 df-ltxr 11151 df-le 11152 df-sub 11346 df-neg 11347 df-nn 12126 df-2 12188 df-3 12189 df-4 12190 df-5 12191 df-6 12192 df-7 12193 df-8 12194 df-9 12195 df-n0 12382 df-z 12469 df-dec 12589 df-uz 12733 df-fz 13408 df-struct 17058 df-slot 17093 df-ndx 17105 df-base 17121 df-tset 17180 df-ple 17181 df-ocomp 17182 df-proset 18200 df-poset 18219 df-lub 18250 df-ipo 18434 |
| This theorem is referenced by: (None) |
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