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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 3331 | . . 3 ⊢ (𝐴 ∈ (V ∖ V) → 𝐴 ∈ V) | |
| 2 | eldifn 3332 | . . 3 ⊢ (𝐴 ∈ (V ∖ V) → ¬ 𝐴 ∈ V) | |
| 3 | 1, 2 | pm2.65i 644 | . 2 ⊢ ¬ 𝐴 ∈ (V ∖ V) |
| 4 | df-nul 3497 | . . 3 ⊢ ∅ = (V ∖ V) | |
| 5 | 4 | eleq2i 2298 | . 2 ⊢ (𝐴 ∈ ∅ ↔ 𝐴 ∈ (V ∖ V)) |
| 6 | 3, 5 | mtbir 678 | 1 ⊢ ¬ 𝐴 ∈ ∅ |
| Colors of variables: wff set class |
| Syntax hints: ¬ wn 3 ∈ wcel 2202 Vcvv 2803 ∖ cdif 3198 ∅c0 3496 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 619 ax-in2 620 ax-io 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-ext 2213 |
| This theorem depends on definitions: df-bi 117 df-tru 1401 df-nf 1510 df-sb 1811 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2364 df-v 2805 df-dif 3203 df-nul 3497 |
| This theorem is referenced by: nel02 3501 n0i 3502 n0rf 3509 rex0 3514 eq0 3515 abvor0dc 3520 rab0 3525 un0 3530 in0 3531 0ss 3535 disj 3545 ral0 3598 rabsnifsb 3741 rabsnif 3742 int0 3947 iun0 4032 0iun 4033 br0 4142 exmid01 4294 nlim0 4497 nsuceq0g 4521 ordtriexmidlem 4623 ordtriexmidlem2 4624 ordtriexmid 4625 ontriexmidim 4626 ordtri2or2exmidlem 4630 onsucelsucexmidlem 4633 reg2exmidlema 4638 reg3exmidlemwe 4683 nn0eln0 4724 0xp 4812 dm0 4951 dm0rn0 4954 reldm0 4955 cnv0 5147 co02 5257 0fv 5686 acexmidlema 6019 acexmidlemb 6020 acexmidlemab 6022 mpo0 6101 nnsucelsuc 6702 nnsucuniel 6706 nnmordi 6727 nnaordex 6739 0er 6779 elssdc 7137 fidcenumlemrk 7196 nnnninfeq 7370 iftrueb01 7484 pw1if 7486 elni2 7577 nlt1pig 7604 0npr 7746 fzm1 10380 frec2uzltd 10711 0tonninf 10748 sum0 12012 fsumsplit 12031 sumsplitdc 12056 fsum2dlemstep 12058 prod0 12209 fprod2dlemstep 12246 ennnfonelem1 13091 0g0 13522 0ntop 14801 0met 15178 lgsdir2lem3 15832 vtxdg0v 16218 clwwlkn0 16332 clwwlknnn 16336 clwwlk0on0 16355 eupth2lem1 16382 eupth2lem3lem4fi 16397 bdcnul 16564 bj-nnelirr 16652 nnnninfex 16731 |
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