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| Mirrors > Home > MPE Home > Th. List > isfinite | Structured version Visualization version GIF version | ||
| Description: A set is finite iff it is strictly dominated by the class of natural number. Theorem 42 of [Suppes] p. 151. The Axiom of Infinity is used for the forward implication. (Contributed by FL, 16-Apr-2011.) |
| Ref | Expression |
|---|---|
| isfinite | ⊢ (𝐴 ∈ Fin ↔ 𝐴 ≺ ω) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | omex 9622 | . 2 ⊢ ω ∈ V | |
| 2 | isfiniteg 9270 | . 2 ⊢ (ω ∈ V → (𝐴 ∈ Fin ↔ 𝐴 ≺ ω)) | |
| 3 | 1, 2 | ax-mp 5 | 1 ⊢ (𝐴 ∈ Fin ↔ 𝐴 ≺ ω) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ↔ wb 209 ∈ wcel 2145 Vcvv 3450 class class class wbr 5103 ωcom 7862 ≺ csdm 8951 Fincfn 8952 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2732 ax-sep 5251 ax-nul 5263 ax-pow 5330 ax-pr 5398 ax-un 7736 ax-inf2 9620 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-ral 3077 df-rex 3087 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3740 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-pss 3919 df-nul 4280 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-int 4908 df-iun 4953 df-br 5104 df-opab 5168 df-mpt 5187 df-tr 5213 df-id 5550 df-eprel 5555 df-po 5563 df-so 5564 df-fr 5608 df-we 5610 df-xp 5661 df-rel 5662 df-cnv 5663 df-co 5664 df-dm 5665 df-rn 5666 df-res 5667 df-ima 5668 df-pred 6299 df-ord 6360 df-on 6361 df-lim 6362 df-suc 6363 df-iota 6489 df-fun 6535 df-fn 6536 df-f 6537 df-f1 6538 df-fo 6539 df-f1o 6540 df-fv 6541 df-ov 7416 df-om 7863 df-2nd 7987 df-frecs 8280 df-wrecs 8311 df-recs 8360 df-rdg 8399 df-1o 8455 df-er 8696 df-en 8953 df-dom 8954 df-sdom 8955 df-fin 8956 |
| This theorem is used by: fict 9632 infxpenlem 10016 pwsdompw 10205 cflim2 10265 axcc4dom 10443 domtriom 10445 fin41 10446 dominf 10447 dominfac 10582 canthp1lem2 10662 pwfseqlem3 10669 pwfseqlem4a 10670 pwfseqlem4 10671 gchpwdom 10679 gchaleph 10680 gchhar 10688 omina 10700 gchina 10708 tskpr 10779 rexpen 16316 odinf 19690 fctop2 23230 dis1stc 23725 iunmbl2 25785 dyadmbl 25828 f1ocnt 33271 sibfof 34851 pibt2 38171 mblfinlem1 38406 ovoliunnfl 38411 heiborlem3 38563 ctbnfien 43659 pellex 43676 numinfctb 43944 saluncl 47145 meadjun 47290 meaiunlelem 47296 omeunle 47344 |
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