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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 3329 | . . 3 ⊢ (𝐴 ∈ (V ∖ V) → 𝐴 ∈ V) | |
| 2 | eldifn 3330 | . . 3 ⊢ (𝐴 ∈ (V ∖ V) → ¬ 𝐴 ∈ V) | |
| 3 | 1, 2 | pm2.65i 644 | . 2 ⊢ ¬ 𝐴 ∈ (V ∖ V) |
| 4 | df-nul 3495 | . . 3 ⊢ ∅ = (V ∖ V) | |
| 5 | 4 | eleq2i 2298 | . 2 ⊢ (𝐴 ∈ ∅ ↔ 𝐴 ∈ (V ∖ V)) |
| 6 | 3, 5 | mtbir 677 | 1 ⊢ ¬ 𝐴 ∈ ∅ |
| Colors of variables: wff set class |
| Syntax hints: ¬ wn 3 ∈ wcel 2202 Vcvv 2802 ∖ cdif 3197 ∅c0 3494 |
| 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 716 ax-5 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-10 1553 ax-11 1554 ax-i12 1555 ax-bndl 1557 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-ext 2213 |
| This theorem depends on definitions: df-bi 117 df-tru 1400 df-nf 1509 df-sb 1811 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2363 df-v 2804 df-dif 3202 df-nul 3495 |
| This theorem is referenced by: nel02 3499 n0i 3500 n0rf 3507 rex0 3512 eq0 3513 abvor0dc 3518 rab0 3523 un0 3528 in0 3529 0ss 3533 disj 3543 ral0 3596 rabsnifsb 3737 rabsnif 3738 int0 3942 iun0 4027 0iun 4028 br0 4137 exmid01 4288 nlim0 4491 nsuceq0g 4515 ordtriexmidlem 4617 ordtriexmidlem2 4618 ordtriexmid 4619 ontriexmidim 4620 ordtri2or2exmidlem 4624 onsucelsucexmidlem 4627 reg2exmidlema 4632 reg3exmidlemwe 4677 nn0eln0 4718 0xp 4806 dm0 4945 dm0rn0 4948 reldm0 4949 cnv0 5140 co02 5250 0fv 5677 acexmidlema 6009 acexmidlemb 6010 acexmidlemab 6012 mpo0 6091 nnsucelsuc 6659 nnsucuniel 6663 nnmordi 6684 nnaordex 6696 0er 6736 elssdc 7094 fidcenumlemrk 7153 nnnninfeq 7327 iftrueb01 7441 pw1if 7443 elni2 7534 nlt1pig 7561 0npr 7703 fzm1 10335 frec2uzltd 10666 0tonninf 10703 sum0 11967 fsumsplit 11986 sumsplitdc 12011 fsum2dlemstep 12013 prod0 12164 fprod2dlemstep 12201 ennnfonelem1 13046 0g0 13477 0ntop 14750 0met 15127 lgsdir2lem3 15778 vtxdg0v 16164 clwwlkn0 16278 clwwlknnn 16282 clwwlk0on0 16301 eupth2lem1 16328 eupth2lem3lem4fi 16343 if0ab 16452 bdcnul 16511 bj-nnelirr 16599 nnnninfex 16675 |
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