Intuitionistic Logic Explorer |
< Previous
Next >
Nearby theorems |
||
Mirrors > Home > ILE Home > Th. List > 1pi | GIF version |
Description: Ordinal 'one' is a positive integer. (Contributed by NM, 29-Oct-1995.) |
Ref | Expression |
---|---|
1pi | ⊢ 1o ∈ N |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 1onn 6416 | . 2 ⊢ 1o ∈ ω | |
2 | 1n0 6329 | . 2 ⊢ 1o ≠ ∅ | |
3 | elni 7116 | . 2 ⊢ (1o ∈ N ↔ (1o ∈ ω ∧ 1o ≠ ∅)) | |
4 | 1, 2, 3 | mpbir2an 926 | 1 ⊢ 1o ∈ N |
Colors of variables: wff set class |
Syntax hints: ∈ wcel 1480 ≠ wne 2308 ∅c0 3363 ωcom 4504 1oc1o 6306 Ncnpi 7080 |
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 603 ax-in2 604 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-13 1491 ax-14 1492 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2121 ax-sep 4046 ax-nul 4054 ax-pow 4098 ax-pr 4131 ax-un 4355 |
This theorem depends on definitions: df-bi 116 df-3an 964 df-tru 1334 df-nf 1437 df-sb 1736 df-clab 2126 df-cleq 2132 df-clel 2135 df-nfc 2270 df-ne 2309 df-ral 2421 df-rex 2422 df-v 2688 df-dif 3073 df-un 3075 df-in 3077 df-ss 3084 df-nul 3364 df-pw 3512 df-sn 3533 df-pr 3534 df-uni 3737 df-int 3772 df-suc 4293 df-iom 4505 df-1o 6313 df-ni 7112 |
This theorem is referenced by: mulidpi 7126 1lt2pi 7148 nlt1pig 7149 indpi 7150 1nq 7174 1qec 7196 mulidnq 7197 1lt2nq 7214 archnqq 7225 prarloclemarch 7226 prarloclemarch2 7227 nnnq 7230 ltnnnq 7231 nq0m0r 7264 nq0a0 7265 addpinq1 7272 nq02m 7273 prarloclemlt 7301 prarloclemlo 7302 prarloclemn 7307 prarloclemcalc 7310 nqprm 7350 caucvgprlemm 7476 caucvgprprlemml 7502 caucvgprprlemmu 7503 caucvgsrlemasr 7598 caucvgsr 7610 nntopi 7702 |
Copyright terms: Public domain | W3C validator |