![]() |
Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
|
Mirrors > Home > MPE Home > Th. List > 0domg | Structured version Visualization version GIF version |
Description: Any set dominates the empty set. (Contributed by NM, 26-Oct-2003.) (Revised by Mario Carneiro, 26-Apr-2015.) Avoid ax-pow 5383, ax-un 7770. (Revised by BTernaryTau, 29-Nov-2024.) |
Ref | Expression |
---|---|
0domg | ⊢ (𝐴 ∈ 𝑉 → ∅ ≼ 𝐴) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 0ex 5325 | . . 3 ⊢ ∅ ∈ V | |
2 | f1eq1 6812 | . . 3 ⊢ (𝑓 = ∅ → (𝑓:∅–1-1→𝐴 ↔ ∅:∅–1-1→𝐴)) | |
3 | f10 6895 | . . 3 ⊢ ∅:∅–1-1→𝐴 | |
4 | 1, 2, 3 | ceqsexv2d 3545 | . 2 ⊢ ∃𝑓 𝑓:∅–1-1→𝐴 |
5 | brdom2g 9015 | . . 3 ⊢ ((∅ ∈ V ∧ 𝐴 ∈ 𝑉) → (∅ ≼ 𝐴 ↔ ∃𝑓 𝑓:∅–1-1→𝐴)) | |
6 | 1, 5 | mpan 689 | . 2 ⊢ (𝐴 ∈ 𝑉 → (∅ ≼ 𝐴 ↔ ∃𝑓 𝑓:∅–1-1→𝐴)) |
7 | 4, 6 | mpbiri 258 | 1 ⊢ (𝐴 ∈ 𝑉 → ∅ ≼ 𝐴) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 206 ∃wex 1777 ∈ wcel 2108 Vcvv 3488 ∅c0 4352 class class class wbr 5166 –1-1→wf1 6570 ≼ cdom 9001 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1793 ax-4 1807 ax-5 1909 ax-6 1967 ax-7 2007 ax-8 2110 ax-9 2118 ax-10 2141 ax-11 2158 ax-12 2178 ax-ext 2711 ax-sep 5317 ax-nul 5324 ax-pr 5447 |
This theorem depends on definitions: df-bi 207 df-an 396 df-or 847 df-3an 1089 df-tru 1540 df-fal 1550 df-ex 1778 df-nf 1782 df-sb 2065 df-mo 2543 df-clab 2718 df-cleq 2732 df-clel 2819 df-ral 3068 df-rex 3077 df-rab 3444 df-v 3490 df-dif 3979 df-un 3981 df-ss 3993 df-nul 4353 df-if 4549 df-sn 4649 df-pr 4651 df-op 4655 df-br 5167 df-opab 5229 df-id 5593 df-xp 5706 df-rel 5707 df-cnv 5708 df-co 5709 df-dm 5710 df-rn 5711 df-fun 6575 df-fn 6576 df-f 6577 df-f1 6578 df-dom 9005 |
This theorem is referenced by: dom0OLD 9169 0sdomg 9170 0sdomgOLD 9171 0dom 9172 sdom0OLD 9175 carddomi2 10039 wdomfil 10130 wdomnumr 10133 hashge0 14436 ufildom1 23955 harn0 43059 safesnsupfidom1o 43379 sn1dom 43488 |
Copyright terms: Public domain | W3C validator |