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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 3341 | . . 3 ⊢ (𝐴 ∈ (V ∖ V) → 𝐴 ∈ V) | |
| 2 | eldifn 3342 | . . 3 ⊢ (𝐴 ∈ (V ∖ V) → ¬ 𝐴 ∈ V) | |
| 3 | 1, 2 | pm2.65i 644 | . 2 ⊢ ¬ 𝐴 ∈ (V ∖ V) |
| 4 | df-nul 3509 | . . 3 ⊢ ∅ = (V ∖ V) | |
| 5 | 4 | eleq2i 2299 | . 2 ⊢ (𝐴 ∈ ∅ ↔ 𝐴 ∈ (V ∖ V)) |
| 6 | 3, 5 | mtbir 678 | 1 ⊢ ¬ 𝐴 ∈ ∅ |
| Colors of variables: wff set class |
| Syntax hints: ¬ wn 3 ∈ wcel 2203 Vcvv 2813 ∖ cdif 3208 ∅c0 3508 |
| 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 2214 |
| This theorem depends on definitions: df-bi 117 df-tru 1401 df-nf 1510 df-sb 1812 df-clab 2219 df-cleq 2225 df-clel 2228 df-nfc 2373 df-v 2815 df-dif 3213 df-nul 3509 |
| This theorem is referenced by: nel02 3513 n0i 3514 n0rf 3521 rex0 3526 eq0 3527 abvor0dc 3532 rab0 3537 un0 3542 in0 3543 0ss 3547 disj 3557 ral0 3611 rabsnifsb 3757 rabsnif 3758 int0 3963 iun0 4048 0iun 4049 br0 4158 exmid01 4311 nlim0 4515 nsuceq0g 4539 ordtriexmidlem 4641 ordtriexmidlem2 4642 ordtriexmid 4643 ontriexmidim 4644 ordtri2or2exmidlem 4648 onsucelsucexmidlem 4651 reg2exmidlema 4656 reg3exmidlemwe 4701 nn0eln0 4742 0xp 4830 dm0 4970 dm0rn0 4973 reldm0 4974 cnv0 5166 co02 5276 0fv 5708 acexmidlema 6041 acexmidlemb 6042 acexmidlemab 6044 mpo0 6123 nnsucelsuc 6724 nnsucuniel 6728 nnmordi 6749 nnaordex 6761 0er 6801 elssdc 7162 fissfi 7216 fidcenumlemrk 7224 nnnninfeq 7419 iftrueb01 7533 pw1if 7535 elni2 7629 nlt1pig 7656 0npr 7798 fzm1 10434 frec2uzltd 10765 0tonninf 10802 sum0 12074 fsumsplit 12093 sumsplitdc 12118 fsum2dlemstep 12120 prod0 12271 fprod2dlemstep 12308 ennnfonelem1 13158 0g0 13589 0ntop 14872 0met 15249 lgsdir2lem3 15903 vtxdg0v 16289 clwwlkn0 16403 clwwlknnn 16407 clwwlk0on0 16426 eupth2lem1 16453 eupth2lem3lem4fi 16468 bdcnul 16635 bj-nnelirr 16723 nnnninfex 16800 |
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