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Mirrors > Home > MPE Home > Th. List > Mathboxes > dfom5b | Structured version Visualization version GIF version |
Description: A quantifier-free definition of ω that does not depend on ax-inf 8535. (Note: label was changed from dfom5 8547 to dfom5b 32019 to prevent naming conflict. NM, 12-Feb-2013.) (Contributed by Scott Fenton, 11-Apr-2012.) |
Ref | Expression |
---|---|
dfom5b | ⊢ ω = (On ∩ ∩ Limits ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | vex 3203 | . . . . . 6 ⊢ 𝑥 ∈ V | |
2 | 1 | elint 4481 | . . . . 5 ⊢ (𝑥 ∈ ∩ Limits ↔ ∀𝑦(𝑦 ∈ Limits → 𝑥 ∈ 𝑦)) |
3 | vex 3203 | . . . . . . . 8 ⊢ 𝑦 ∈ V | |
4 | 3 | ellimits 32017 | . . . . . . 7 ⊢ (𝑦 ∈ Limits ↔ Lim 𝑦) |
5 | 4 | imbi1i 339 | . . . . . 6 ⊢ ((𝑦 ∈ Limits → 𝑥 ∈ 𝑦) ↔ (Lim 𝑦 → 𝑥 ∈ 𝑦)) |
6 | 5 | albii 1747 | . . . . 5 ⊢ (∀𝑦(𝑦 ∈ Limits → 𝑥 ∈ 𝑦) ↔ ∀𝑦(Lim 𝑦 → 𝑥 ∈ 𝑦)) |
7 | 2, 6 | bitr2i 265 | . . . 4 ⊢ (∀𝑦(Lim 𝑦 → 𝑥 ∈ 𝑦) ↔ 𝑥 ∈ ∩ Limits ) |
8 | 7 | anbi2i 730 | . . 3 ⊢ ((𝑥 ∈ On ∧ ∀𝑦(Lim 𝑦 → 𝑥 ∈ 𝑦)) ↔ (𝑥 ∈ On ∧ 𝑥 ∈ ∩ Limits )) |
9 | elom 7068 | . . 3 ⊢ (𝑥 ∈ ω ↔ (𝑥 ∈ On ∧ ∀𝑦(Lim 𝑦 → 𝑥 ∈ 𝑦))) | |
10 | elin 3796 | . . 3 ⊢ (𝑥 ∈ (On ∩ ∩ Limits ) ↔ (𝑥 ∈ On ∧ 𝑥 ∈ ∩ Limits )) | |
11 | 8, 9, 10 | 3bitr4i 292 | . 2 ⊢ (𝑥 ∈ ω ↔ 𝑥 ∈ (On ∩ ∩ Limits )) |
12 | 11 | eqriv 2619 | 1 ⊢ ω = (On ∩ ∩ Limits ) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 384 ∀wal 1481 = wceq 1483 ∈ wcel 1990 ∩ cin 3573 ∩ cint 4475 Oncon0 5723 Lim wlim 5724 ωcom 7065 Limits climits 31943 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-8 1992 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 ax-sep 4781 ax-nul 4789 ax-pow 4843 ax-pr 4906 ax-un 6949 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-3an 1039 df-tru 1486 df-ex 1705 df-nf 1710 df-sb 1881 df-eu 2474 df-mo 2475 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-ne 2795 df-ral 2917 df-rex 2918 df-rab 2921 df-v 3202 df-sbc 3436 df-dif 3577 df-un 3579 df-in 3581 df-ss 3588 df-symdif 3844 df-nul 3916 df-if 4087 df-pw 4160 df-sn 4178 df-pr 4180 df-op 4184 df-uni 4437 df-int 4476 df-br 4654 df-opab 4713 df-mpt 4730 df-tr 4753 df-id 5024 df-eprel 5029 df-po 5035 df-so 5036 df-fr 5073 df-we 5075 df-xp 5120 df-rel 5121 df-cnv 5122 df-co 5123 df-dm 5124 df-rn 5125 df-res 5126 df-ord 5726 df-on 5727 df-lim 5728 df-iota 5851 df-fun 5890 df-fn 5891 df-f 5892 df-fo 5894 df-fv 5896 df-om 7066 df-1st 7168 df-2nd 7169 df-txp 31961 df-bigcup 31965 df-fix 31966 df-limits 31967 |
This theorem is referenced by: (None) |
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