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Mirrors > Home > ILE Home > Th. List > ssfidc | Unicode version |
Description: A subset of a finite set is finite if membership in the subset is decidable. (Contributed by Jim Kingdon, 27-May-2022.) |
Ref | Expression |
---|---|
ssfidc | DECID |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dfss1 3250 | . . . 4 | |
2 | 1 | biimpi 119 | . . 3 |
3 | 2 | 3ad2ant2 988 | . 2 DECID |
4 | dfin5 3048 | . . 3 | |
5 | simp1 966 | . . . 4 DECID | |
6 | simp3 968 | . . . 4 DECID DECID | |
7 | 5, 6 | ssfirab 6790 | . . 3 DECID |
8 | 4, 7 | eqeltrid 2204 | . 2 DECID |
9 | 3, 8 | eqeltrrd 2195 | 1 DECID |
Colors of variables: wff set class |
Syntax hints: wi 4 DECID wdc 804 w3a 947 wceq 1316 wcel 1465 wral 2393 crab 2397 cin 3040 wss 3041 cfn 6602 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 588 ax-in2 589 ax-io 683 ax-5 1408 ax-7 1409 ax-gen 1410 ax-ie1 1454 ax-ie2 1455 ax-8 1467 ax-10 1468 ax-11 1469 ax-i12 1470 ax-bndl 1471 ax-4 1472 ax-13 1476 ax-14 1477 ax-17 1491 ax-i9 1495 ax-ial 1499 ax-i5r 1500 ax-ext 2099 ax-coll 4013 ax-sep 4016 ax-nul 4024 ax-pow 4068 ax-pr 4101 ax-un 4325 ax-setind 4422 ax-iinf 4472 |
This theorem depends on definitions: df-bi 116 df-dc 805 df-3or 948 df-3an 949 df-tru 1319 df-fal 1322 df-nf 1422 df-sb 1721 df-eu 1980 df-mo 1981 df-clab 2104 df-cleq 2110 df-clel 2113 df-nfc 2247 df-ne 2286 df-ral 2398 df-rex 2399 df-reu 2400 df-rab 2402 df-v 2662 df-sbc 2883 df-csb 2976 df-dif 3043 df-un 3045 df-in 3047 df-ss 3054 df-nul 3334 df-if 3445 df-pw 3482 df-sn 3503 df-pr 3504 df-op 3506 df-uni 3707 df-int 3742 df-iun 3785 df-br 3900 df-opab 3960 df-mpt 3961 df-tr 3997 df-id 4185 df-iord 4258 df-on 4260 df-suc 4263 df-iom 4475 df-xp 4515 df-rel 4516 df-cnv 4517 df-co 4518 df-dm 4519 df-rn 4520 df-res 4521 df-ima 4522 df-iota 5058 df-fun 5095 df-fn 5096 df-f 5097 df-f1 5098 df-fo 5099 df-f1o 5100 df-fv 5101 df-1o 6281 df-er 6397 df-en 6603 df-fin 6605 |
This theorem is referenced by: fisumss 11129 |
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