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Mirrors > Home > MPE Home > Th. List > abn0 | Structured version Visualization version GIF version |
Description: Nonempty class abstraction. See also ab0 3905. (Contributed by NM, 26-Dec-1996.) (Proof shortened by Mario Carneiro, 11-Nov-2016.) |
Ref | Expression |
---|---|
abn0 | ⊢ ({𝑥 ∣ 𝜑} ≠ ∅ ↔ ∃𝑥𝜑) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nfab1 2753 | . . 3 ⊢ Ⅎ𝑥{𝑥 ∣ 𝜑} | |
2 | 1 | n0f 3886 | . 2 ⊢ ({𝑥 ∣ 𝜑} ≠ ∅ ↔ ∃𝑥 𝑥 ∈ {𝑥 ∣ 𝜑}) |
3 | abid 2598 | . . 3 ⊢ (𝑥 ∈ {𝑥 ∣ 𝜑} ↔ 𝜑) | |
4 | 3 | exbii 1764 | . 2 ⊢ (∃𝑥 𝑥 ∈ {𝑥 ∣ 𝜑} ↔ ∃𝑥𝜑) |
5 | 2, 4 | bitri 263 | 1 ⊢ ({𝑥 ∣ 𝜑} ≠ ∅ ↔ ∃𝑥𝜑) |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 195 ∃wex 1695 ∈ wcel 1977 {cab 2596 ≠ wne 2780 ∅c0 3874 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-clab 2597 df-cleq 2603 df-clel 2606 df-nfc 2740 df-ne 2782 df-v 3175 df-dif 3543 df-nul 3875 |
This theorem is referenced by: rabn0OLD 3913 intexab 4749 iinexg 4751 relimasn 5407 inisegn0 5416 mapprc 7748 modom 8046 tz9.1c 8489 scott0 8632 scott0s 8634 cp 8637 karden 8641 acnrcl 8748 aceq3lem 8826 cff 8953 cff1 8963 cfss 8970 domtriomlem 9147 axdclem 9224 nqpr 9715 supadd 10868 supmul 10872 hashf1lem2 13097 hashf1 13098 mreiincl 16079 efgval 17953 efger 17954 birthdaylem3 24480 disjex 28787 disjexc 28788 mppsval 30723 mblfinlem3 32618 ismblfin 32620 itg2addnc 32634 sdclem1 32709 upbdrech 38460 |
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