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| Mirrors > Home > MPE Home > Th. List > onintrab2 | Structured version Visualization version GIF version | ||
| Description: An existence condition equivalent to an intersection's being an ordinal number. (Contributed by NM, 6-Nov-2003.) |
| Ref | Expression |
|---|---|
| onintrab2 | ⊢ (∃𝑥 ∈ On 𝜑 ↔ ∩ {𝑥 ∈ On ∣ 𝜑} ∈ On) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | intexrab 5282 | . 2 ⊢ (∃𝑥 ∈ On 𝜑 ↔ ∩ {𝑥 ∈ On ∣ 𝜑} ∈ V) | |
| 2 | onintrab 7746 | . 2 ⊢ (∩ {𝑥 ∈ On ∣ 𝜑} ∈ V ↔ ∩ {𝑥 ∈ On ∣ 𝜑} ∈ On) | |
| 3 | 1, 2 | bitri 276 | 1 ⊢ (∃𝑥 ∈ On 𝜑 ↔ ∩ {𝑥 ∈ On ∣ 𝜑} ∈ On) |
| Colors of variables: wff setvar class |
| Syntax hints: ↔ wb 207 ∈ wcel 2119 ∃wrex 3064 {crab 3392 Vcvv 3432 ∩ cint 4884 Oncon0 6317 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1974 ax-7 2015 ax-8 2121 ax-9 2129 ax-10 2152 ax-11 2168 ax-12 2189 ax-ext 2712 ax-sep 5225 ax-pr 5369 |
| This theorem depends on definitions: df-bi 208 df-an 397 df-or 854 df-3or 1093 df-3an 1094 df-tru 1550 df-fal 1560 df-ex 1787 df-nf 1791 df-sb 2074 df-clab 2719 df-cleq 2732 df-clel 2815 df-ne 2936 df-ral 3055 df-rex 3065 df-rab 3393 df-v 3434 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-pss 3910 df-nul 4269 df-if 4462 df-pw 4538 df-sn 4563 df-pr 4565 df-op 4569 df-uni 4846 df-int 4885 df-br 5080 df-opab 5142 df-tr 5187 df-eprel 5525 df-po 5533 df-so 5534 df-fr 5578 df-we 5580 df-ord 6320 df-on 6321 |
| This theorem is referenced by: oeeulem 8534 cofon1 8605 cofon2 8606 cofonr 8607 naddcllem 8609 naddunif 8626 cardmin2 9921 cardaleph 10009 cardmin 10484 nosepon 27654 onvf1odlem4 35341 minregex 43985 |
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