Intuitionistic Logic Explorer |
< Previous
Next >
Nearby theorems |
||
Mirrors > Home > ILE Home > Th. List > nnsseleq | Unicode version |
Description: For natural numbers, inclusion is equivalent to membership or equality. (Contributed by Jim Kingdon, 16-Sep-2021.) |
Ref | Expression |
---|---|
nnsseleq |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nntri1 6392 | . . 3 | |
2 | nntri3or 6389 | . . . . . 6 | |
3 | df-3or 963 | . . . . . 6 | |
4 | 2, 3 | sylib 121 | . . . . 5 |
5 | 4 | orcomd 718 | . . . 4 |
6 | 5 | ord 713 | . . 3 |
7 | 1, 6 | sylbid 149 | . 2 |
8 | nnord 4525 | . . . . 5 | |
9 | 8 | adantl 275 | . . . 4 |
10 | ordelss 4301 | . . . . 5 | |
11 | 10 | ex 114 | . . . 4 |
12 | 9, 11 | syl 14 | . . 3 |
13 | eqimss 3151 | . . . 4 | |
14 | 13 | a1i 9 | . . 3 |
15 | 12, 14 | jaod 706 | . 2 |
16 | 7, 15 | impbid 128 | 1 |
Colors of variables: wff set class |
Syntax hints: wn 3 wi 4 wa 103 wb 104 wo 697 w3o 961 wceq 1331 wcel 1480 wss 3071 word 4284 com 4504 |
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 ax-setind 4452 ax-iinf 4502 |
This theorem depends on definitions: df-bi 116 df-3or 963 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-tr 4027 df-iord 4288 df-on 4290 df-suc 4293 df-iom 4505 |
This theorem is referenced by: nnsssuc 6398 frec2uzled 10202 |
Copyright terms: Public domain | W3C validator |