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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 9619 | . 2 ⊢ ω ∈ V | |
| 2 | isfiniteg 9267 | . 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 2146 Vcvv 3457 class class class wbr 5111 ωcom 7868 ≺ csdm 8948 Fincfn 8949 |
| 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 2148 ax-9 2156 ax-10 2179 ax-11 2195 ax-12 2216 ax-ext 2737 ax-sep 5259 ax-nul 5271 ax-pow 5338 ax-pr 5406 ax-un 7742 ax-inf2 9617 |
| 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 2569 df-eu 2599 df-clab 2744 df-cleq 2757 df-clel 2840 df-nfc 2914 df-ne 2961 df-ral 3082 df-rex 3092 df-reu 3372 df-rab 3419 df-v 3459 df-sbc 3747 df-csb 3855 df-dif 3909 df-un 3911 df-in 3913 df-ss 3923 df-pss 3926 df-nul 4287 df-if 4490 df-pw 4566 df-sn 4592 df-pr 4594 df-op 4598 df-uni 4875 df-int 4915 df-iun 4960 df-br 5112 df-opab 5176 df-mpt 5195 df-tr 5221 df-id 5558 df-eprel 5563 df-po 5571 df-so 5572 df-fr 5616 df-we 5618 df-xp 5669 df-rel 5670 df-cnv 5671 df-co 5672 df-dm 5673 df-rn 5674 df-res 5675 df-ima 5676 df-pred 6306 df-ord 6367 df-on 6368 df-lim 6369 df-suc 6370 df-iota 6496 df-fun 6542 df-fn 6543 df-f 6544 df-f1 6545 df-fo 6546 df-f1o 6547 df-fv 6548 df-ov 7422 df-om 7869 df-2nd 7993 df-frecs 8284 df-wrecs 8315 df-recs 8364 df-rdg 8403 df-1o 8459 df-er 8700 df-en 8950 df-dom 8951 df-sdom 8952 df-fin 8953 |
| This theorem is used by: fict 9629 infxpenlem 10013 pwsdompw 10202 cflim2 10262 axcc4dom 10440 domtriom 10442 fin41 10443 dominf 10444 dominfac 10573 canthp1lem2 10653 pwfseqlem3 10660 pwfseqlem4a 10661 pwfseqlem4 10662 gchpwdom 10670 gchaleph 10671 gchhar 10679 omina 10691 gchina 10699 tskpr 10770 rexpen 16306 odinf 19677 fctop2 23212 dis1stc 23707 iunmbl2 25767 dyadmbl 25810 f1ocnt 33215 sibfof 34795 pibt2 38120 mblfinlem1 38365 ovoliunnfl 38370 heiborlem3 38522 ctbnfien 43603 pellex 43620 numinfctb 43888 saluncl 47089 meadjun 47234 meaiunlelem 47240 omeunle 47288 |
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