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Mirrors > Home > MPE Home > Th. List > oldbdayim | Structured version Visualization version GIF version |
Description: If 𝑋 is in the old set for 𝐴, then the birthday of 𝑋 is less than 𝐴. (Contributed by Scott Fenton, 10-Aug-2024.) |
Ref | Expression |
---|---|
oldbdayim | ⊢ (𝑋 ∈ ( O ‘𝐴) → ( bday ‘𝑋) ∈ 𝐴) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elfvdm 6944 | . . 3 ⊢ (𝑋 ∈ ( O ‘𝐴) → 𝐴 ∈ dom O ) | |
2 | oldf 27911 | . . . 4 ⊢ O :On⟶𝒫 No | |
3 | 2 | fdmi 6748 | . . 3 ⊢ dom O = On |
4 | 1, 3 | eleqtrdi 2849 | . 2 ⊢ (𝑋 ∈ ( O ‘𝐴) → 𝐴 ∈ On) |
5 | elold 27923 | . . 3 ⊢ (𝐴 ∈ On → (𝑋 ∈ ( O ‘𝐴) ↔ ∃𝑏 ∈ 𝐴 𝑋 ∈ ( M ‘𝑏))) | |
6 | madebdayim 27941 | . . . . . 6 ⊢ (𝑋 ∈ ( M ‘𝑏) → ( bday ‘𝑋) ⊆ 𝑏) | |
7 | 6 | ad2antll 729 | . . . . 5 ⊢ ((𝐴 ∈ On ∧ (𝑏 ∈ 𝐴 ∧ 𝑋 ∈ ( M ‘𝑏))) → ( bday ‘𝑋) ⊆ 𝑏) |
8 | simprl 771 | . . . . 5 ⊢ ((𝐴 ∈ On ∧ (𝑏 ∈ 𝐴 ∧ 𝑋 ∈ ( M ‘𝑏))) → 𝑏 ∈ 𝐴) | |
9 | bdayelon 27836 | . . . . . . 7 ⊢ ( bday ‘𝑋) ∈ On | |
10 | ontr2 6433 | . . . . . . 7 ⊢ ((( bday ‘𝑋) ∈ On ∧ 𝐴 ∈ On) → ((( bday ‘𝑋) ⊆ 𝑏 ∧ 𝑏 ∈ 𝐴) → ( bday ‘𝑋) ∈ 𝐴)) | |
11 | 9, 10 | mpan 690 | . . . . . 6 ⊢ (𝐴 ∈ On → ((( bday ‘𝑋) ⊆ 𝑏 ∧ 𝑏 ∈ 𝐴) → ( bday ‘𝑋) ∈ 𝐴)) |
12 | 11 | adantr 480 | . . . . 5 ⊢ ((𝐴 ∈ On ∧ (𝑏 ∈ 𝐴 ∧ 𝑋 ∈ ( M ‘𝑏))) → ((( bday ‘𝑋) ⊆ 𝑏 ∧ 𝑏 ∈ 𝐴) → ( bday ‘𝑋) ∈ 𝐴)) |
13 | 7, 8, 12 | mp2and 699 | . . . 4 ⊢ ((𝐴 ∈ On ∧ (𝑏 ∈ 𝐴 ∧ 𝑋 ∈ ( M ‘𝑏))) → ( bday ‘𝑋) ∈ 𝐴) |
14 | 13 | rexlimdvaa 3154 | . . 3 ⊢ (𝐴 ∈ On → (∃𝑏 ∈ 𝐴 𝑋 ∈ ( M ‘𝑏) → ( bday ‘𝑋) ∈ 𝐴)) |
15 | 5, 14 | sylbid 240 | . 2 ⊢ (𝐴 ∈ On → (𝑋 ∈ ( O ‘𝐴) → ( bday ‘𝑋) ∈ 𝐴)) |
16 | 4, 15 | mpcom 38 | 1 ⊢ (𝑋 ∈ ( O ‘𝐴) → ( bday ‘𝑋) ∈ 𝐴) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 395 ∈ wcel 2106 ∃wrex 3068 ⊆ wss 3963 𝒫 cpw 4605 dom cdm 5689 Oncon0 6386 ‘cfv 6563 No csur 27699 bday cbday 27701 M cmade 27896 O cold 27897 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1908 ax-6 1965 ax-7 2005 ax-8 2108 ax-9 2116 ax-10 2139 ax-11 2155 ax-12 2175 ax-ext 2706 ax-rep 5285 ax-sep 5302 ax-nul 5312 ax-pow 5371 ax-pr 5438 ax-un 7754 |
This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1540 df-fal 1550 df-ex 1777 df-nf 1781 df-sb 2063 df-mo 2538 df-eu 2567 df-clab 2713 df-cleq 2727 df-clel 2814 df-nfc 2890 df-ne 2939 df-ral 3060 df-rex 3069 df-rmo 3378 df-reu 3379 df-rab 3434 df-v 3480 df-sbc 3792 df-csb 3909 df-dif 3966 df-un 3968 df-in 3970 df-ss 3980 df-pss 3983 df-nul 4340 df-if 4532 df-pw 4607 df-sn 4632 df-pr 4634 df-tp 4636 df-op 4638 df-uni 4913 df-int 4952 df-iun 4998 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5583 df-eprel 5589 df-po 5597 df-so 5598 df-fr 5641 df-we 5643 df-xp 5695 df-rel 5696 df-cnv 5697 df-co 5698 df-dm 5699 df-rn 5700 df-res 5701 df-ima 5702 df-pred 6323 df-ord 6389 df-on 6390 df-suc 6392 df-iota 6516 df-fun 6565 df-fn 6566 df-f 6567 df-f1 6568 df-fo 6569 df-f1o 6570 df-fv 6571 df-riota 7388 df-ov 7434 df-oprab 7435 df-mpo 7436 df-2nd 8014 df-frecs 8305 df-wrecs 8336 df-recs 8410 df-1o 8505 df-2o 8506 df-no 27702 df-slt 27703 df-bday 27704 df-sslt 27841 df-scut 27843 df-made 27901 df-old 27902 |
This theorem is referenced by: oldirr 27943 oldbday 27954 addsbdaylem 28064 negsproplem2 28076 negsbdaylem 28103 mulsproplem2 28158 mulsproplem3 28159 mulsproplem4 28160 mulsproplem5 28161 mulsproplem6 28162 mulsproplem7 28163 mulsproplem8 28164 |
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