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| Mirrors > Home > MPE Home > Th. List > ackbij1lem4 | Structured version Visualization version GIF version | ||
| Description: Lemma for ackbij2 10256. (Contributed by Stefan O'Rear, 19-Nov-2014.) |
| Ref | Expression |
|---|---|
| ackbij1lem4 | ⊢ (𝐴 ∈ ω → {𝐴} ∈ (𝒫 ω ∩ Fin)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | snelpwi 5418 | . 2 ⊢ (𝐴 ∈ ω → {𝐴} ∈ 𝒫 ω) | |
| 2 | snfi 9057 | . . 3 ⊢ {𝐴} ∈ Fin | |
| 3 | 2 | a1i 11 | . 2 ⊢ (𝐴 ∈ ω → {𝐴} ∈ Fin) |
| 4 | 1, 3 | elind 4175 | 1 ⊢ (𝐴 ∈ ω → {𝐴} ∈ (𝒫 ω ∩ Fin)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∈ wcel 2108 ∩ cin 3925 𝒫 cpw 4575 {csn 4601 ωcom 7861 Fincfn 8959 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2007 ax-8 2110 ax-9 2118 ax-12 2177 ax-ext 2707 ax-sep 5266 ax-nul 5276 ax-pr 5402 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-sb 2065 df-mo 2539 df-clab 2714 df-cleq 2727 df-clel 2809 df-ne 2933 df-ral 3052 df-rex 3061 df-rab 3416 df-v 3461 df-dif 3929 df-un 3931 df-in 3933 df-ss 3943 df-pss 3946 df-nul 4309 df-if 4501 df-pw 4577 df-sn 4602 df-pr 4604 df-op 4608 df-uni 4884 df-br 5120 df-opab 5182 df-tr 5230 df-id 5548 df-eprel 5553 df-po 5561 df-so 5562 df-fr 5606 df-we 5608 df-xp 5660 df-rel 5661 df-cnv 5662 df-co 5663 df-dm 5664 df-rn 5665 df-ord 6355 df-on 6356 df-lim 6357 df-suc 6358 df-fun 6533 df-fn 6534 df-f 6535 df-f1 6536 df-fo 6537 df-f1o 6538 df-om 7862 df-1o 8480 df-en 8960 df-fin 8963 |
| This theorem is referenced by: ackbij1lem8 10240 ackbij1lem14 10246 ackbij1lem16 10248 ackbij1lem18 10250 |
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