Intuitionistic Logic Explorer |
< Previous
Next >
Nearby theorems |
||
Mirrors > Home > ILE Home > Th. List > df2o3 | GIF version |
Description: Expanded value of the ordinal number 2. (Contributed by Mario Carneiro, 14-Aug-2015.) |
Ref | Expression |
---|---|
df2o3 | ⊢ 2o = {∅, 1o} |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-2o 6376 | . 2 ⊢ 2o = suc 1o | |
2 | df-suc 4343 | . 2 ⊢ suc 1o = (1o ∪ {1o}) | |
3 | df1o2 6388 | . . . 4 ⊢ 1o = {∅} | |
4 | 3 | uneq1i 3267 | . . 3 ⊢ (1o ∪ {1o}) = ({∅} ∪ {1o}) |
5 | df-pr 3577 | . . 3 ⊢ {∅, 1o} = ({∅} ∪ {1o}) | |
6 | 4, 5 | eqtr4i 2188 | . 2 ⊢ (1o ∪ {1o}) = {∅, 1o} |
7 | 1, 2, 6 | 3eqtri 2189 | 1 ⊢ 2o = {∅, 1o} |
Colors of variables: wff set class |
Syntax hints: = wceq 1342 ∪ cun 3109 ∅c0 3404 {csn 3570 {cpr 3571 suc csuc 4337 1oc1o 6368 2oc2o 6369 |
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 1434 ax-7 1435 ax-gen 1436 ax-ie1 1480 ax-ie2 1481 ax-8 1491 ax-10 1492 ax-11 1493 ax-i12 1494 ax-bndl 1496 ax-4 1497 ax-17 1513 ax-i9 1517 ax-ial 1521 ax-i5r 1522 ax-ext 2146 |
This theorem depends on definitions: df-bi 116 df-tru 1345 df-nf 1448 df-sb 1750 df-clab 2151 df-cleq 2157 df-clel 2160 df-nfc 2295 df-v 2723 df-dif 3113 df-un 3115 df-nul 3405 df-pr 3577 df-suc 4343 df-1o 6375 df-2o 6376 |
This theorem is referenced by: df2o2 6390 2oconcl 6398 0lt2o 6400 1lt2o 6401 el2oss1o 6402 en2eqpr 6864 nninfisol 7088 finomni 7095 exmidomniim 7096 exmidomni 7097 ismkvnex 7110 exmidfodomrlemr 7149 exmidfodomrlemrALT 7150 xp2dju 7162 pw1nel3 7178 sucpw1nel3 7180 unct 12312 2o01f 13710 nninfalllem1 13722 nninfall 13723 nninfsellemqall 13729 nninfomnilem 13732 |
Copyright terms: Public domain | W3C validator |