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Mirrors > Home > ILE Home > Th. List > noel | GIF version |
Description: The empty set has no elements. Theorem 6.14 of [Quine] p. 44. (Contributed by NM, 5-Aug-1993.) (Proof shortened by Mario Carneiro, 1-Sep-2015.) |
Ref | Expression |
---|---|
noel | ⊢ ¬ 𝐴 ∈ ∅ |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eldifi 3094 | . . 3 ⊢ (𝐴 ∈ (V ∖ V) → 𝐴 ∈ V) | |
2 | eldifn 3095 | . . 3 ⊢ (𝐴 ∈ (V ∖ V) → ¬ 𝐴 ∈ V) | |
3 | 1, 2 | pm2.65i 600 | . 2 ⊢ ¬ 𝐴 ∈ (V ∖ V) |
4 | df-nul 3252 | . . 3 ⊢ ∅ = (V ∖ V) | |
5 | 4 | eleq2i 2145 | . 2 ⊢ (𝐴 ∈ ∅ ↔ 𝐴 ∈ (V ∖ V)) |
6 | 3, 5 | mtbir 628 | 1 ⊢ ¬ 𝐴 ∈ ∅ |
Colors of variables: wff set class |
Syntax hints: ¬ wn 3 ∈ wcel 1433 Vcvv 2601 ∖ cdif 2970 ∅c0 3251 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-in1 576 ax-in2 577 ax-io 662 ax-5 1376 ax-7 1377 ax-gen 1378 ax-ie1 1422 ax-ie2 1423 ax-8 1435 ax-10 1436 ax-11 1437 ax-i12 1438 ax-bndl 1439 ax-4 1440 ax-17 1459 ax-i9 1463 ax-ial 1467 ax-i5r 1468 ax-ext 2063 |
This theorem depends on definitions: df-bi 115 df-tru 1287 df-nf 1390 df-sb 1686 df-clab 2068 df-cleq 2074 df-clel 2077 df-nfc 2208 df-v 2603 df-dif 2975 df-nul 3252 |
This theorem is referenced by: n0i 3256 n0rf 3260 rex0 3265 eq0 3266 abvor0dc 3269 rab0 3273 un0 3278 in0 3279 0ss 3282 disj 3292 ral0 3342 int0 3650 iun0 3734 0iun 3735 nlim0 4149 nsuceq0g 4173 ordtriexmidlem 4263 ordtriexmidlem2 4264 ordtriexmid 4265 ordtri2or2exmidlem 4269 onsucelsucexmidlem 4272 reg2exmidlema 4277 reg3exmidlemwe 4321 nn0eln0 4359 0xp 4438 dm0 4567 dm0rn0 4570 reldm0 4571 cnv0 4747 co02 4854 0fv 5229 acexmidlema 5523 acexmidlemb 5524 acexmidlemab 5526 mpt20 5594 nnsucelsuc 6093 nnmordi 6112 nnaordex 6123 0er 6163 elni2 6504 nlt1pig 6531 0npr 6673 fzm1 9117 frec2uzltd 9405 bdcnul 10656 bj-nnelirr 10748 |
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