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Mirrors > Home > MPE Home > Th. List > abn0 | Structured version Visualization version GIF version |
Description: Nonempty class abstraction. See also ab0 3951. (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 2766 | . . 3 ⊢ Ⅎ𝑥{𝑥 ∣ 𝜑} | |
2 | 1 | n0f 3927 | . 2 ⊢ ({𝑥 ∣ 𝜑} ≠ ∅ ↔ ∃𝑥 𝑥 ∈ {𝑥 ∣ 𝜑}) |
3 | abid 2610 | . . 3 ⊢ (𝑥 ∈ {𝑥 ∣ 𝜑} ↔ 𝜑) | |
4 | 3 | exbii 1774 | . 2 ⊢ (∃𝑥 𝑥 ∈ {𝑥 ∣ 𝜑} ↔ ∃𝑥𝜑) |
5 | 2, 4 | bitri 264 | 1 ⊢ ({𝑥 ∣ 𝜑} ≠ ∅ ↔ ∃𝑥𝜑) |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 196 ∃wex 1704 ∈ wcel 1990 {cab 2608 ≠ wne 2794 ∅c0 3915 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-tru 1486 df-ex 1705 df-nf 1710 df-sb 1881 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-ne 2795 df-v 3202 df-dif 3577 df-nul 3916 |
This theorem is referenced by: rabn0OLD 3959 intexab 4822 iinexg 4824 relimasn 5488 inisegn0 5497 mapprc 7861 modom 8161 tz9.1c 8606 scott0 8749 scott0s 8751 cp 8754 karden 8758 acnrcl 8865 aceq3lem 8943 cff 9070 cff1 9080 cfss 9087 domtriomlem 9264 axdclem 9341 nqpr 9836 supadd 10991 supmul 10995 hashf1lem2 13240 hashf1 13241 mreiincl 16256 efgval 18130 efger 18131 birthdaylem3 24680 disjex 29405 disjexc 29406 mppsval 31469 mblfinlem3 33448 ismblfin 33450 itg2addnc 33464 sdclem1 33539 upbdrech 39519 |
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