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Mirrors > Home > ILE Home > Th. List > dfn2 | Unicode version |
Description: The set of positive integers defined in terms of nonnegative integers. (Contributed by NM, 23-Sep-2007.) (Proof shortened by Mario Carneiro, 13-Feb-2013.) |
Ref | Expression |
---|---|
dfn2 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-n0 9002 | . . 3 | |
2 | 1 | difeq1i 3195 | . 2 |
3 | difun2 3447 | . 2 | |
4 | 0nnn 8771 | . . 3 | |
5 | difsn 3665 | . . 3 | |
6 | 4, 5 | ax-mp 5 | . 2 |
7 | 2, 3, 6 | 3eqtrri 2166 | 1 |
Colors of variables: wff set class |
Syntax hints: wn 3 wceq 1332 wcel 1481 cdif 3073 cun 3074 csn 3532 cc0 7644 cn 8744 cn0 9001 |
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 604 ax-in2 605 ax-io 699 ax-5 1424 ax-7 1425 ax-gen 1426 ax-ie1 1470 ax-ie2 1471 ax-8 1483 ax-10 1484 ax-11 1485 ax-i12 1486 ax-bndl 1487 ax-4 1488 ax-13 1492 ax-14 1493 ax-17 1507 ax-i9 1511 ax-ial 1515 ax-i5r 1516 ax-ext 2122 ax-sep 4054 ax-pow 4106 ax-pr 4139 ax-un 4363 ax-setind 4460 ax-cnex 7735 ax-resscn 7736 ax-1re 7738 ax-addrcl 7741 ax-0lt1 7750 ax-0id 7752 ax-rnegex 7753 ax-pre-ltirr 7756 ax-pre-lttrn 7758 ax-pre-ltadd 7760 |
This theorem depends on definitions: df-bi 116 df-3an 965 df-tru 1335 df-fal 1338 df-nf 1438 df-sb 1737 df-eu 2003 df-mo 2004 df-clab 2127 df-cleq 2133 df-clel 2136 df-nfc 2271 df-ne 2310 df-nel 2405 df-ral 2422 df-rex 2423 df-rab 2426 df-v 2691 df-dif 3078 df-un 3080 df-in 3082 df-ss 3089 df-nul 3369 df-pw 3517 df-sn 3538 df-pr 3539 df-op 3541 df-uni 3745 df-int 3780 df-br 3938 df-opab 3998 df-xp 4553 df-cnv 4555 df-iota 5096 df-fv 5139 df-ov 5785 df-pnf 7826 df-mnf 7827 df-xr 7828 df-ltxr 7829 df-le 7830 df-inn 8745 df-n0 9002 |
This theorem is referenced by: elnnne0 9015 nn0supp 9053 facnn 10505 fac0 10506 fzo0dvdseq 11591 |
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