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Mirrors > Home > ILE Home > Th. List > 0lt1o | GIF version |
Description: Ordinal zero is less than ordinal one. (Contributed by NM, 5-Jan-2005.) |
Ref | Expression |
---|---|
0lt1o | ⊢ ∅ ∈ 1o |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqid 2137 | . 2 ⊢ ∅ = ∅ | |
2 | el1o 6327 | . 2 ⊢ (∅ ∈ 1o ↔ ∅ = ∅) | |
3 | 1, 2 | mpbir 145 | 1 ⊢ ∅ ∈ 1o |
Colors of variables: wff set class |
Syntax hints: = wceq 1331 ∈ wcel 1480 ∅c0 3358 1oc1o 6299 |
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-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2119 ax-nul 4049 |
This theorem depends on definitions: df-bi 116 df-tru 1334 df-nf 1437 df-sb 1736 df-clab 2124 df-cleq 2130 df-clel 2133 df-nfc 2268 df-v 2683 df-dif 3068 df-un 3070 df-nul 3359 df-sn 3528 df-suc 4288 df-1o 6306 |
This theorem is referenced by: nnaordex 6416 1domsn 6706 snexxph 6831 difinfsnlem 6977 difinfsn 6978 0ct 6985 ctmlemr 6986 ctssdclemn0 6988 exmidfodomrlemr 7051 exmidfodomrlemrALT 7052 1lt2pi 7141 archnqq 7218 prarloclemarch2 7220 pwle2 13182 |
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