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| Mirrors > Home > ILE Home > Th. List > df-nel | GIF version | ||
| Description: Define negated membership. (Contributed by NM, 7-Aug-1994.) |
| Ref | Expression |
|---|---|
| df-nel | ⊢ (𝐴 ∉ 𝐵 ↔ ¬ 𝐴 ∈ 𝐵) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | cA | . . 3 class 𝐴 | |
| 2 | cB | . . 3 class 𝐵 | |
| 3 | 1, 2 | wnel 2515 | . 2 wff 𝐴 ∉ 𝐵 |
| 4 | 1, 2 | wcel 2209 | . . 3 wff 𝐴 ∈ 𝐵 |
| 5 | 4 | wn 3 | . 2 wff ¬ 𝐴 ∈ 𝐵 |
| 6 | 3, 5 | wb 105 | 1 wff (𝐴 ∉ 𝐵 ↔ ¬ 𝐴 ∈ 𝐵) |
| Colors of variables: wff set class |
| This definition is referenced by: neli 2517 nelir 2518 neleq1 2519 neleq2 2520 nfnel 2522 nfneld 2523 elnelne1 2524 elnelne2 2525 nelcon3d 2526 elnelall 2527 ru 3050 sbcnel12g 3164 raldifb 3369 pwnss 4291 pwnex 4590 ruALT 4693 0nelrel 4816 opabn1stprc 6419 fsetdmprc0 6940 fiprc 7094 0mnnnnn0 9574 nelfzo 10537 fvinim0ffz 10638 wrdlndm 11299 wrdsymb0 11315 rennim 11746 fsumsplitsnun 12164 modfsummodlemstep 12202 sqrt2irr0 12920 isnsgrp 13698 vtxvalprc 16210 iedgvalprc 16211 umgrnloop2 16306 1hevtxdg0fi 16462 p1evtxdeqfilem 16466 vdegp1aid 16469 eupth2lem3lem6fi 16626 bdnel 16794 |
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