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Mirrors > Home > ILE Home > Th. List > suc0 | GIF version |
Description: The successor of the empty set. (Contributed by NM, 1-Feb-2005.) |
Ref | Expression |
---|---|
suc0 | ⊢ suc ∅ = {∅} |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-suc 4301 | . 2 ⊢ suc ∅ = (∅ ∪ {∅}) | |
2 | uncom 3225 | . 2 ⊢ (∅ ∪ {∅}) = ({∅} ∪ ∅) | |
3 | un0 3401 | . 2 ⊢ ({∅} ∪ ∅) = {∅} | |
4 | 1, 2, 3 | 3eqtri 2165 | 1 ⊢ suc ∅ = {∅} |
Colors of variables: wff set class |
Syntax hints: = wceq 1332 ∪ cun 3074 ∅c0 3368 {csn 3532 suc csuc 4295 |
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-17 1507 ax-i9 1511 ax-ial 1515 ax-i5r 1516 ax-ext 2122 |
This theorem depends on definitions: df-bi 116 df-tru 1335 df-nf 1438 df-sb 1737 df-clab 2127 df-cleq 2133 df-clel 2136 df-nfc 2271 df-v 2691 df-dif 3078 df-un 3080 df-nul 3369 df-suc 4301 |
This theorem is referenced by: ordtriexmidlem 4443 ordtri2orexmid 4446 2ordpr 4447 onsucsssucexmid 4450 onsucelsucexmid 4453 ordsoexmid 4485 ordtri2or2exmid 4494 nnregexmid 4542 omsinds 4543 tfr0dm 6227 df1o2 6334 nninfsellemdc 13381 |
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