| 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 4934 | . . . . . . 7 ⊢ (∅ ∈ 𝐹 → ∩ 𝐹 = ∅) | |
| 6 | 4, 5 | syl 17 | . . . . . 6 ⊢ (𝜑 → ∩ 𝐹 = ∅) |
| 7 | 6, 4 | eqeltrd 2836 | . . . . 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 49258 | . . 3 ⊢ ((𝜑 ∧ 𝐹 ∈ V) → (𝑈‘∅) = ∩ 𝐹) |
| 11 | 6 | adantr 480 | . . 3 ⊢ ((𝜑 ∧ 𝐹 ∈ V) → ∩ 𝐹 = ∅) |
| 12 | 10, 11 | eqtrd 2771 | . 2 ⊢ ((𝜑 ∧ 𝐹 ∈ V) → (𝑈‘∅) = ∅) |
| 13 | 2 | adantr 480 | . . . . 5 ⊢ ((𝜑 ∧ ¬ 𝐹 ∈ V) → 𝑈 = (lub‘𝐼)) |
| 14 | fvprc 6826 | . . . . . . . 8 ⊢ (¬ 𝐹 ∈ V → (toInc‘𝐹) = ∅) | |
| 15 | 14 | adantl 481 | . . . . . . 7 ⊢ ((𝜑 ∧ ¬ 𝐹 ∈ V) → (toInc‘𝐹) = ∅) |
| 16 | 1, 15 | eqtrid 2783 | . . . . . 6 ⊢ ((𝜑 ∧ ¬ 𝐹 ∈ V) → 𝐼 = ∅) |
| 17 | 16 | fveq2d 6838 | . . . . 5 ⊢ ((𝜑 ∧ ¬ 𝐹 ∈ V) → (lub‘𝐼) = (lub‘∅)) |
| 18 | 13, 17 | eqtrd 2771 | . . . 4 ⊢ ((𝜑 ∧ ¬ 𝐹 ∈ V) → 𝑈 = (lub‘∅)) |
| 19 | 18 | fveq1d 6836 | . . 3 ⊢ ((𝜑 ∧ ¬ 𝐹 ∈ V) → (𝑈‘∅) = ((lub‘∅)‘∅)) |
| 20 | rex0 4312 | . . . . . 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 17143 | . . . . . 6 ⊢ ∅ = (Base‘∅) | |
| 23 | eqid 2736 | . . . . . 6 ⊢ (le‘∅) = (le‘∅) | |
| 24 | eqid 2736 | . . . . . 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 18246 | . . . . . . 7 ⊢ ∅ ∈ Poset | |
| 27 | 26 | a1i 11 | . . . . . 6 ⊢ ((𝜑 ∧ ¬ 𝐹 ∈ V) → ∅ ∈ Poset) |
| 28 | 22, 23, 24, 25, 27 | lubeldm2 49222 | . . . . 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 6866 | . . . 4 ⊢ (¬ ∅ ∈ dom (lub‘∅) → ((lub‘∅)‘∅) = ∅) | |
| 31 | 29, 30 | syl 17 | . . 3 ⊢ ((𝜑 ∧ ¬ 𝐹 ∈ V) → ((lub‘∅)‘∅) = ∅) |
| 32 | 19, 31 | eqtrd 2771 | . 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 2113 ∀wral 3051 ∃wrex 3060 Vcvv 3440 ⊆ wss 3901 ∅c0 4285 ∩ cint 4902 class class class wbr 5098 dom cdm 5624 ‘cfv 6492 lecple 17186 Posetcpo 18232 lubclub 18234 toInccipo 18452 |
| 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 2115 ax-9 2123 ax-10 2146 ax-11 2162 ax-12 2184 ax-ext 2708 ax-rep 5224 ax-sep 5241 ax-nul 5251 ax-pow 5310 ax-pr 5377 ax-un 7680 ax-cnex 11084 ax-resscn 11085 ax-1cn 11086 ax-icn 11087 ax-addcl 11088 ax-addrcl 11089 ax-mulcl 11090 ax-mulrcl 11091 ax-mulcom 11092 ax-addass 11093 ax-mulass 11094 ax-distr 11095 ax-i2m1 11096 ax-1ne0 11097 ax-1rid 11098 ax-rnegex 11099 ax-rrecex 11100 ax-cnre 11101 ax-pre-lttri 11102 ax-pre-lttrn 11103 ax-pre-ltadd 11104 ax-pre-mulgt0 11105 |
| 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 2539 df-eu 2569 df-clab 2715 df-cleq 2728 df-clel 2811 df-nfc 2885 df-ne 2933 df-nel 3037 df-ral 3052 df-rex 3061 df-rmo 3350 df-reu 3351 df-rab 3400 df-v 3442 df-sbc 3741 df-csb 3850 df-dif 3904 df-un 3906 df-in 3908 df-ss 3918 df-pss 3921 df-nul 4286 df-if 4480 df-pw 4556 df-sn 4581 df-pr 4583 df-op 4587 df-uni 4864 df-int 4903 df-iun 4948 df-br 5099 df-opab 5161 df-mpt 5180 df-tr 5206 df-id 5519 df-eprel 5524 df-po 5532 df-so 5533 df-fr 5577 df-we 5579 df-xp 5630 df-rel 5631 df-cnv 5632 df-co 5633 df-dm 5634 df-rn 5635 df-res 5636 df-ima 5637 df-pred 6259 df-ord 6320 df-on 6321 df-lim 6322 df-suc 6323 df-iota 6448 df-fun 6494 df-fn 6495 df-f 6496 df-f1 6497 df-fo 6498 df-f1o 6499 df-fv 6500 df-riota 7315 df-ov 7361 df-oprab 7362 df-mpo 7363 df-om 7809 df-1st 7933 df-2nd 7934 df-frecs 8223 df-wrecs 8254 df-recs 8303 df-rdg 8341 df-1o 8397 df-er 8635 df-en 8886 df-dom 8887 df-sdom 8888 df-fin 8889 df-pnf 11170 df-mnf 11171 df-xr 11172 df-ltxr 11173 df-le 11174 df-sub 11368 df-neg 11369 df-nn 12148 df-2 12210 df-3 12211 df-4 12212 df-5 12213 df-6 12214 df-7 12215 df-8 12216 df-9 12217 df-n0 12404 df-z 12491 df-dec 12610 df-uz 12754 df-fz 13426 df-struct 17076 df-slot 17111 df-ndx 17123 df-base 17139 df-tset 17198 df-ple 17199 df-ocomp 17200 df-proset 18219 df-poset 18238 df-lub 18269 df-ipo 18453 |
| This theorem is referenced by: (None) |
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