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| Mirrors > Home > ILE Home > Th. List > nlt1pig | Unicode version | ||
| Description: No positive integer is less than one. (Contributed by Jim Kingdon, 31-Aug-2019.) |
| Ref | Expression |
|---|---|
| nlt1pig |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | elni 7665 |
. . 3
| |
| 2 | 1 | simprbi 275 |
. 2
|
| 3 | noel 3525 |
. . . . 5
| |
| 4 | 1pi 7672 |
. . . . . . . . 9
| |
| 5 | ltpiord 7676 |
. . . . . . . . 9
| |
| 6 | 4, 5 | mpan2 429 |
. . . . . . . 8
|
| 7 | df-1o 6677 |
. . . . . . . . . 10
| |
| 8 | 7 | eleq2i 2305 |
. . . . . . . . 9
|
| 9 | elsucg 4544 |
. . . . . . . . 9
| |
| 10 | 8, 9 | bitrid 192 |
. . . . . . . 8
|
| 11 | 6, 10 | bitrd 188 |
. . . . . . 7
|
| 12 | 11 | biimpa 296 |
. . . . . 6
|
| 13 | 12 | ord 736 |
. . . . 5
|
| 14 | 3, 13 | mpi 15 |
. . . 4
|
| 15 | 14 | ex 115 |
. . 3
|
| 16 | 15 | necon3ad 2462 |
. 2
|
| 17 | 2, 16 | mpd 13 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 623 ax-in2 624 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-sep 4244 ax-nul 4254 ax-pow 4306 ax-pr 4341 ax-un 4573 |
| This theorem depends on definitions: df-bi 117 df-3an 1011 df-tru 1405 df-nf 1514 df-sb 1816 df-eu 2089 df-mo 2090 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ne 2421 df-ral 2533 df-rex 2534 df-v 2823 df-dif 3222 df-un 3224 df-in 3226 df-ss 3233 df-nul 3521 df-pw 3687 df-sn 3711 df-pr 3712 df-op 3714 df-uni 3931 df-int 3966 df-br 4126 df-opab 4188 df-eprel 4429 df-suc 4511 df-iom 4733 df-xp 4775 df-1o 6677 df-ni 7661 df-lti 7664 |
| This theorem is referenced by: caucvgsr 8159 |
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