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Mirrors > Home > MPE Home > Th. List > dom0 | Structured version Visualization version GIF version |
Description: A set dominated by the empty set is empty. (Contributed by NM, 22-Nov-2004.) |
Ref | Expression |
---|---|
dom0 | ⊢ (𝐴 ≼ ∅ ↔ 𝐴 = ∅) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | reldom 8507 | . . . . 5 ⊢ Rel ≼ | |
2 | 1 | brrelex1i 5601 | . . . 4 ⊢ (𝐴 ≼ ∅ → 𝐴 ∈ V) |
3 | 0domg 8636 | . . . 4 ⊢ (𝐴 ∈ V → ∅ ≼ 𝐴) | |
4 | 2, 3 | syl 17 | . . 3 ⊢ (𝐴 ≼ ∅ → ∅ ≼ 𝐴) |
5 | 4 | pm4.71i 562 | . 2 ⊢ (𝐴 ≼ ∅ ↔ (𝐴 ≼ ∅ ∧ ∅ ≼ 𝐴)) |
6 | sbthb 8630 | . 2 ⊢ ((𝐴 ≼ ∅ ∧ ∅ ≼ 𝐴) ↔ 𝐴 ≈ ∅) | |
7 | en0 8564 | . 2 ⊢ (𝐴 ≈ ∅ ↔ 𝐴 = ∅) | |
8 | 5, 6, 7 | 3bitri 299 | 1 ⊢ (𝐴 ≼ ∅ ↔ 𝐴 = ∅) |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 208 ∧ wa 398 = wceq 1531 ∈ wcel 2108 Vcvv 3493 ∅c0 4289 class class class wbr 5057 ≈ cen 8498 ≼ cdom 8499 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1790 ax-4 1804 ax-5 1905 ax-6 1964 ax-7 2009 ax-8 2110 ax-9 2118 ax-10 2139 ax-11 2154 ax-12 2170 ax-ext 2791 ax-sep 5194 ax-nul 5201 ax-pow 5257 ax-pr 5320 ax-un 7453 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3an 1084 df-tru 1534 df-ex 1775 df-nf 1779 df-sb 2064 df-mo 2616 df-eu 2648 df-clab 2798 df-cleq 2812 df-clel 2891 df-nfc 2961 df-ral 3141 df-rex 3142 df-rab 3145 df-v 3495 df-dif 3937 df-un 3939 df-in 3941 df-ss 3950 df-nul 4290 df-if 4466 df-pw 4539 df-sn 4560 df-pr 4562 df-op 4566 df-uni 4831 df-br 5058 df-opab 5120 df-id 5453 df-xp 5554 df-rel 5555 df-cnv 5556 df-co 5557 df-dm 5558 df-rn 5559 df-res 5560 df-ima 5561 df-fun 6350 df-fn 6351 df-f 6352 df-f1 6353 df-fo 6354 df-f1o 6355 df-er 8281 df-en 8502 df-dom 8503 |
This theorem is referenced by: fin1a2lem11 9824 cfpwsdom 9998 |
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