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Mirrors > Home > MPE Home > Th. List > eq0rdv | Structured version Visualization version GIF version |
Description: Deduction for equality to the empty set. (Contributed by NM, 11-Jul-2014.) Avoid ax-8 2112, df-clel 2816. (Revised by Gino Giotto, 6-Sep-2024.) |
Ref | Expression |
---|---|
eq0rdv.1 | ⊢ (𝜑 → ¬ 𝑥 ∈ 𝐴) |
Ref | Expression |
---|---|
eq0rdv | ⊢ (𝜑 → 𝐴 = ∅) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eq0rdv.1 | . . 3 ⊢ (𝜑 → ¬ 𝑥 ∈ 𝐴) | |
2 | 1 | alrimiv 1935 | . 2 ⊢ (𝜑 → ∀𝑥 ¬ 𝑥 ∈ 𝐴) |
3 | dfnul4 4239 | . . . 4 ⊢ ∅ = {𝑦 ∣ ⊥} | |
4 | 3 | eqeq2i 2750 | . . 3 ⊢ (𝐴 = ∅ ↔ 𝐴 = {𝑦 ∣ ⊥}) |
5 | dfcleq 2730 | . . 3 ⊢ (𝐴 = {𝑦 ∣ ⊥} ↔ ∀𝑥(𝑥 ∈ 𝐴 ↔ 𝑥 ∈ {𝑦 ∣ ⊥})) | |
6 | df-clab 2715 | . . . . . . 7 ⊢ (𝑥 ∈ {𝑦 ∣ ⊥} ↔ [𝑥 / 𝑦]⊥) | |
7 | sbv 2094 | . . . . . . 7 ⊢ ([𝑥 / 𝑦]⊥ ↔ ⊥) | |
8 | 6, 7 | bitri 278 | . . . . . 6 ⊢ (𝑥 ∈ {𝑦 ∣ ⊥} ↔ ⊥) |
9 | 8 | bibi2i 341 | . . . . 5 ⊢ ((𝑥 ∈ 𝐴 ↔ 𝑥 ∈ {𝑦 ∣ ⊥}) ↔ (𝑥 ∈ 𝐴 ↔ ⊥)) |
10 | 9 | albii 1827 | . . . 4 ⊢ (∀𝑥(𝑥 ∈ 𝐴 ↔ 𝑥 ∈ {𝑦 ∣ ⊥}) ↔ ∀𝑥(𝑥 ∈ 𝐴 ↔ ⊥)) |
11 | nbfal 1558 | . . . . . 6 ⊢ (¬ 𝑥 ∈ 𝐴 ↔ (𝑥 ∈ 𝐴 ↔ ⊥)) | |
12 | 11 | bicomi 227 | . . . . 5 ⊢ ((𝑥 ∈ 𝐴 ↔ ⊥) ↔ ¬ 𝑥 ∈ 𝐴) |
13 | 12 | albii 1827 | . . . 4 ⊢ (∀𝑥(𝑥 ∈ 𝐴 ↔ ⊥) ↔ ∀𝑥 ¬ 𝑥 ∈ 𝐴) |
14 | 10, 13 | bitri 278 | . . 3 ⊢ (∀𝑥(𝑥 ∈ 𝐴 ↔ 𝑥 ∈ {𝑦 ∣ ⊥}) ↔ ∀𝑥 ¬ 𝑥 ∈ 𝐴) |
15 | 4, 5, 14 | 3bitrri 301 | . 2 ⊢ (∀𝑥 ¬ 𝑥 ∈ 𝐴 ↔ 𝐴 = ∅) |
16 | 2, 15 | sylib 221 | 1 ⊢ (𝜑 → 𝐴 = ∅) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ↔ wb 209 ∀wal 1541 = wceq 1543 ⊥wfal 1555 [wsb 2070 ∈ wcel 2110 {cab 2714 ∅c0 4237 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1803 ax-4 1817 ax-5 1918 ax-6 1976 ax-7 2016 ax-9 2120 ax-ext 2708 |
This theorem depends on definitions: df-bi 210 df-an 400 df-tru 1546 df-fal 1556 df-ex 1788 df-sb 2071 df-clab 2715 df-cleq 2729 df-dif 3869 df-nul 4238 |
This theorem is referenced by: map0b 8564 disjen 8803 mapdom1 8811 pwxpndom2 10279 fzdisj 13139 smu01lem 16044 prmreclem5 16473 vdwap0 16529 natfval 17453 fucbas 17468 fuchom 17469 fuchomOLD 17470 coafval 17570 efgval 19107 lsppratlem6 20189 lbsextlem4 20198 psrvscafval 20915 cfinufil 22825 ufinffr 22826 fin1aufil 22829 bldisj 23296 reconnlem1 23723 pcofval 23907 bcthlem5 24225 volfiniun 24444 fta1g 25065 fta1 25201 rpvmasum 26407 0ringprmidl 31339 unblimceq0 34424 bj-ab0 34830 bj-projval 34923 finxpnom 35309 ipo0 41740 ifr0 41741 limclner 42867 |
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