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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 9564 | . 2 ⊢ ω ∈ V | |
| 2 | isfiniteg 9212 | . 2 ⊢ (ω ∈ V → (𝐴 ∈ Fin ↔ 𝐴 ≺ ω)) | |
| 3 | 1, 2 | ax-mp 5 | 1 ⊢ (𝐴 ∈ Fin ↔ 𝐴 ≺ ω) |
| Colors of variables: wff setvar class |
| Syntax hints: ↔ wb 206 ∈ wcel 2114 Vcvv 3442 class class class wbr 5100 ωcom 7818 ≺ csdm 8894 Fincfn 8895 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-sep 5243 ax-nul 5253 ax-pow 5312 ax-pr 5379 ax-un 7690 ax-inf2 9562 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-ral 3053 df-rex 3063 df-reu 3353 df-rab 3402 df-v 3444 df-sbc 3743 df-csb 3852 df-dif 3906 df-un 3908 df-in 3910 df-ss 3920 df-pss 3923 df-nul 4288 df-if 4482 df-pw 4558 df-sn 4583 df-pr 4585 df-op 4589 df-uni 4866 df-int 4905 df-iun 4950 df-br 5101 df-opab 5163 df-mpt 5182 df-tr 5208 df-id 5527 df-eprel 5532 df-po 5540 df-so 5541 df-fr 5585 df-we 5587 df-xp 5638 df-rel 5639 df-cnv 5640 df-co 5641 df-dm 5642 df-rn 5643 df-res 5644 df-ima 5645 df-pred 6267 df-ord 6328 df-on 6329 df-lim 6330 df-suc 6331 df-iota 6456 df-fun 6502 df-fn 6503 df-f 6504 df-f1 6505 df-fo 6506 df-f1o 6507 df-fv 6508 df-ov 7371 df-om 7819 df-2nd 7944 df-frecs 8233 df-wrecs 8264 df-recs 8313 df-rdg 8351 df-1o 8407 df-er 8645 df-en 8896 df-dom 8897 df-sdom 8898 df-fin 8899 |
| This theorem is referenced by: fict 9574 infxpenlem 9935 pwsdompw 10125 cflim2 10185 axcc4dom 10363 domtriom 10365 fin41 10366 dominf 10367 dominfac 10496 canthp1lem2 10576 pwfseqlem3 10583 pwfseqlem4a 10584 pwfseqlem4 10585 gchpwdom 10593 gchaleph 10594 gchhar 10602 omina 10614 gchina 10622 tskpr 10693 rexpen 16165 odinf 19504 fctop2 22961 dis1stc 23455 iunmbl2 25526 dyadmbl 25569 f1ocnt 32891 sibfof 34518 pibt2 37672 mblfinlem1 37908 ovoliunnfl 37913 heiborlem3 38064 ctbnfien 43175 pellex 43192 numinfctb 43460 saluncl 46675 meadjun 46820 meaiunlelem 46826 omeunle 46874 |
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