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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 used 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 4296 pwnex 4595 ruALT 4698 0nelrel 4821 opabn1stprc 6429 fsetdmprc0 6950 fiprc 7104 0mnnnnn0 9599 nelfzo 10569 fvinim0ffz 10670 wrdlndm 11335 wrdsymb0 11351 rennim 11782 fsumsplitsnun 12202 modfsummodlemstep 12240 sqrt2irr0 12959 isnsgrp 13770 vtxvalprc 16394 iedgvalprc 16395 umgrnloop2 16490 1hevtxdg0fi 16646 p1evtxdeqfilem 16650 vdegp1aid 16653 eupth2lem3lem6fi 16810 bdnel 16978 |
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