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Mirrors > Home > MPE Home > Th. List > fin11a | Structured version Visualization version GIF version |
Description: Every I-finite set is Ia-finite. (Contributed by Stefan O'Rear, 30-Oct-2014.) (Revised by Mario Carneiro, 17-May-2015.) |
Ref | Expression |
---|---|
fin11a | ⊢ (𝐴 ∈ Fin → 𝐴 ∈ FinIa) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elpwi 4551 | . . . . 5 ⊢ (𝑥 ∈ 𝒫 𝐴 → 𝑥 ⊆ 𝐴) | |
2 | ssfi 8741 | . . . . 5 ⊢ ((𝐴 ∈ Fin ∧ 𝑥 ⊆ 𝐴) → 𝑥 ∈ Fin) | |
3 | 1, 2 | sylan2 594 | . . . 4 ⊢ ((𝐴 ∈ Fin ∧ 𝑥 ∈ 𝒫 𝐴) → 𝑥 ∈ Fin) |
4 | 3 | orcd 869 | . . 3 ⊢ ((𝐴 ∈ Fin ∧ 𝑥 ∈ 𝒫 𝐴) → (𝑥 ∈ Fin ∨ (𝐴 ∖ 𝑥) ∈ Fin)) |
5 | 4 | ralrimiva 3185 | . 2 ⊢ (𝐴 ∈ Fin → ∀𝑥 ∈ 𝒫 𝐴(𝑥 ∈ Fin ∨ (𝐴 ∖ 𝑥) ∈ Fin)) |
6 | isfin1a 9717 | . 2 ⊢ (𝐴 ∈ Fin → (𝐴 ∈ FinIa ↔ ∀𝑥 ∈ 𝒫 𝐴(𝑥 ∈ Fin ∨ (𝐴 ∖ 𝑥) ∈ Fin))) | |
7 | 5, 6 | mpbird 259 | 1 ⊢ (𝐴 ∈ Fin → 𝐴 ∈ FinIa) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 398 ∨ wo 843 ∈ wcel 2113 ∀wral 3141 ∖ cdif 3936 ⊆ wss 3939 𝒫 cpw 4542 Fincfn 8512 FinIacfin1a 9703 |
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 1969 ax-7 2014 ax-8 2115 ax-9 2123 ax-10 2144 ax-11 2160 ax-12 2176 ax-ext 2796 ax-sep 5206 ax-nul 5213 ax-pow 5269 ax-pr 5333 ax-un 7464 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1539 df-ex 1780 df-nf 1784 df-sb 2069 df-mo 2621 df-eu 2653 df-clab 2803 df-cleq 2817 df-clel 2896 df-nfc 2966 df-ne 3020 df-ral 3146 df-rex 3147 df-rab 3150 df-v 3499 df-sbc 3776 df-dif 3942 df-un 3944 df-in 3946 df-ss 3955 df-pss 3957 df-nul 4295 df-if 4471 df-pw 4544 df-sn 4571 df-pr 4573 df-tp 4575 df-op 4577 df-uni 4842 df-br 5070 df-opab 5132 df-tr 5176 df-id 5463 df-eprel 5468 df-po 5477 df-so 5478 df-fr 5517 df-we 5519 df-xp 5564 df-rel 5565 df-cnv 5566 df-co 5567 df-dm 5568 df-rn 5569 df-res 5570 df-ima 5571 df-ord 6197 df-on 6198 df-lim 6199 df-suc 6200 df-fun 6360 df-fn 6361 df-f 6362 df-f1 6363 df-fo 6364 df-f1o 6365 df-om 7584 df-er 8292 df-en 8513 df-fin 8516 df-fin1a 9710 |
This theorem is referenced by: (None) |
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