![]() |
Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
|
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.) |
Ref | Expression |
---|---|
eq0rdv.1 | ⊢ (𝜑 → ¬ 𝑥 ∈ 𝐴) |
Ref | Expression |
---|---|
eq0rdv | ⊢ (𝜑 → 𝐴 = ∅) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eq0rdv.1 | . . . 4 ⊢ (𝜑 → ¬ 𝑥 ∈ 𝐴) | |
2 | 1 | pm2.21d 121 | . . 3 ⊢ (𝜑 → (𝑥 ∈ 𝐴 → 𝑥 ∈ ∅)) |
3 | 2 | ssrdv 3921 | . 2 ⊢ (𝜑 → 𝐴 ⊆ ∅) |
4 | ss0 4306 | . 2 ⊢ (𝐴 ⊆ ∅ → 𝐴 = ∅) | |
5 | 3, 4 | syl 17 | 1 ⊢ (𝜑 → 𝐴 = ∅) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 = wceq 1538 ∈ wcel 2111 ⊆ wss 3881 ∅c0 4243 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-ext 2770 |
This theorem depends on definitions: df-bi 210 df-an 400 df-ex 1782 df-sb 2070 df-clab 2777 df-cleq 2791 df-clel 2870 df-v 3443 df-dif 3884 df-in 3888 df-ss 3898 df-nul 4244 |
This theorem is referenced by: map0b 8430 disjen 8658 mapdom1 8666 pwxpndom2 10076 fzdisj 12929 smu01lem 15824 prmreclem5 16246 vdwap0 16302 natfval 17208 fucbas 17222 fuchom 17223 coafval 17316 efgval 18835 lsppratlem6 19917 lbsextlem4 19926 psrvscafval 20628 cfinufil 22533 ufinffr 22534 fin1aufil 22537 bldisj 23005 reconnlem1 23431 pcofval 23615 bcthlem5 23932 volfiniun 24151 fta1g 24768 fta1 24904 rpvmasum 26110 0ringprmidl 31033 unblimceq0 33959 bj-projval 34432 finxpnom 34818 ipo0 41153 ifr0 41154 limclner 42293 |
Copyright terms: Public domain | W3C validator |