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Mirrors > Home > ILE Home > Th. List > 1n0 | GIF version |
Description: Ordinal one is not equal to ordinal zero. (Contributed by NM, 26-Dec-2004.) |
Ref | Expression |
---|---|
1n0 | ⊢ 1o ≠ ∅ |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df1o2 6326 | . 2 ⊢ 1o = {∅} | |
2 | 0ex 4055 | . . 3 ⊢ ∅ ∈ V | |
3 | 2 | snnz 3642 | . 2 ⊢ {∅} ≠ ∅ |
4 | 1, 3 | eqnetri 2331 | 1 ⊢ 1o ≠ ∅ |
Colors of variables: wff set class |
Syntax hints: ≠ wne 2308 ∅c0 3363 {csn 3527 1oc1o 6306 |
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 2121 ax-nul 4054 |
This theorem depends on definitions: df-bi 116 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-v 2688 df-dif 3073 df-un 3075 df-nul 3364 df-sn 3533 df-suc 4293 df-1o 6313 |
This theorem is referenced by: xp01disj 6330 xp01disjl 6331 djulclb 6940 djuinr 6948 eldju2ndl 6957 djune 6963 updjudhf 6964 updjudhcoinrg 6966 exmidomni 7014 fodjum 7018 fodju0 7019 ismkvnex 7029 mkvprop 7032 1pi 7123 unct 11954 pwle2 13193 subctctexmid 13196 peano3nninf 13201 nninfalllem1 13203 nninfall 13204 nninfsellemeq 13210 nninfsellemqall 13211 nninffeq 13216 |
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