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Mirrors > Home > MPE Home > Th. List > domssr | Structured version Visualization version GIF version |
Description: If 𝐶 is a superset of 𝐵 and 𝐵 dominates 𝐴, then 𝐶 also dominates 𝐴. (Contributed by BTernaryTau, 7-Dec-2024.) |
Ref | Expression |
---|---|
domssr | ⊢ ((𝐶 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐶 ∧ 𝐴 ≼ 𝐵) → 𝐴 ≼ 𝐶) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | brdomi 8779 | . . 3 ⊢ (𝐴 ≼ 𝐵 → ∃𝑓 𝑓:𝐴–1-1→𝐵) | |
2 | 1 | 3ad2ant3 1135 | . 2 ⊢ ((𝐶 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐶 ∧ 𝐴 ≼ 𝐵) → ∃𝑓 𝑓:𝐴–1-1→𝐵) |
3 | simp2 1137 | . . 3 ⊢ ((𝐶 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐶 ∧ 𝐴 ≼ 𝐵) → 𝐵 ⊆ 𝐶) | |
4 | reldom 8770 | . . . . 5 ⊢ Rel ≼ | |
5 | 4 | brrelex1i 5654 | . . . 4 ⊢ (𝐴 ≼ 𝐵 → 𝐴 ∈ V) |
6 | 5 | 3ad2ant3 1135 | . . 3 ⊢ ((𝐶 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐶 ∧ 𝐴 ≼ 𝐵) → 𝐴 ∈ V) |
7 | simp1 1136 | . . 3 ⊢ ((𝐶 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐶 ∧ 𝐴 ≼ 𝐵) → 𝐶 ∈ 𝑉) | |
8 | 3, 6, 7 | jca32 517 | . 2 ⊢ ((𝐶 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐶 ∧ 𝐴 ≼ 𝐵) → (𝐵 ⊆ 𝐶 ∧ (𝐴 ∈ V ∧ 𝐶 ∈ 𝑉))) |
9 | f1ss 6706 | . . . . 5 ⊢ ((𝑓:𝐴–1-1→𝐵 ∧ 𝐵 ⊆ 𝐶) → 𝑓:𝐴–1-1→𝐶) | |
10 | vex 3441 | . . . . . . 7 ⊢ 𝑓 ∈ V | |
11 | f1dom4g 8786 | . . . . . . 7 ⊢ (((𝑓 ∈ V ∧ 𝐴 ∈ V ∧ 𝐶 ∈ 𝑉) ∧ 𝑓:𝐴–1-1→𝐶) → 𝐴 ≼ 𝐶) | |
12 | 10, 11 | mp3anl1 1455 | . . . . . 6 ⊢ (((𝐴 ∈ V ∧ 𝐶 ∈ 𝑉) ∧ 𝑓:𝐴–1-1→𝐶) → 𝐴 ≼ 𝐶) |
13 | 12 | ancoms 460 | . . . . 5 ⊢ ((𝑓:𝐴–1-1→𝐶 ∧ (𝐴 ∈ V ∧ 𝐶 ∈ 𝑉)) → 𝐴 ≼ 𝐶) |
14 | 9, 13 | sylan 581 | . . . 4 ⊢ (((𝑓:𝐴–1-1→𝐵 ∧ 𝐵 ⊆ 𝐶) ∧ (𝐴 ∈ V ∧ 𝐶 ∈ 𝑉)) → 𝐴 ≼ 𝐶) |
15 | 14 | expl 459 | . . 3 ⊢ (𝑓:𝐴–1-1→𝐵 → ((𝐵 ⊆ 𝐶 ∧ (𝐴 ∈ V ∧ 𝐶 ∈ 𝑉)) → 𝐴 ≼ 𝐶)) |
16 | 15 | exlimiv 1931 | . 2 ⊢ (∃𝑓 𝑓:𝐴–1-1→𝐵 → ((𝐵 ⊆ 𝐶 ∧ (𝐴 ∈ V ∧ 𝐶 ∈ 𝑉)) → 𝐴 ≼ 𝐶)) |
17 | 2, 8, 16 | sylc 65 | 1 ⊢ ((𝐶 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐶 ∧ 𝐴 ≼ 𝐵) → 𝐴 ≼ 𝐶) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 397 ∧ w3a 1087 ∃wex 1779 ∈ wcel 2104 Vcvv 3437 ⊆ wss 3892 class class class wbr 5081 –1-1→wf1 6455 ≼ cdom 8762 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1911 ax-6 1969 ax-7 2009 ax-8 2106 ax-9 2114 ax-ext 2707 ax-sep 5232 ax-nul 5239 ax-pr 5361 |
This theorem depends on definitions: df-bi 206 df-an 398 df-or 846 df-3an 1089 df-tru 1542 df-fal 1552 df-ex 1780 df-sb 2066 df-clab 2714 df-cleq 2728 df-clel 2814 df-ral 3063 df-rex 3072 df-rab 3306 df-v 3439 df-dif 3895 df-un 3897 df-in 3899 df-ss 3909 df-nul 4263 df-if 4466 df-sn 4566 df-pr 4568 df-op 4572 df-br 5082 df-opab 5144 df-xp 5606 df-rel 5607 df-cnv 5608 df-co 5609 df-dm 5610 df-rn 5611 df-fun 6460 df-fn 6461 df-f 6462 df-f1 6463 df-dom 8766 |
This theorem is referenced by: 0sdom1dom 9059 rex2dom 9067 |
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