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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 8965 | . . 3 ⊢ (𝐴 ≼ 𝐵 → ∃𝑓 𝑓:𝐴–1-1→𝐵) | |
| 2 | 1 | 3ad2ant3 1153 | . 2 ⊢ ((𝐶 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐶 ∧ 𝐴 ≼ 𝐵) → ∃𝑓 𝑓:𝐴–1-1→𝐵) |
| 3 | simp2 1155 | . . 3 ⊢ ((𝐶 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐶 ∧ 𝐴 ≼ 𝐵) → 𝐵 ⊆ 𝐶) | |
| 4 | reldom 8958 | . . . . 5 ⊢ Rel ≼ | |
| 5 | 4 | brrelex1i 5722 | . . . 4 ⊢ (𝐴 ≼ 𝐵 → 𝐴 ∈ V) |
| 6 | 5 | 3ad2ant3 1153 | . . 3 ⊢ ((𝐶 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐶 ∧ 𝐴 ≼ 𝐵) → 𝐴 ∈ V) |
| 7 | simp1 1154 | . . 3 ⊢ ((𝐶 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐶 ∧ 𝐴 ≼ 𝐵) → 𝐶 ∈ 𝑉) | |
| 8 | 3, 6, 7 | jca32 525 | . 2 ⊢ ((𝐶 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐶 ∧ 𝐴 ≼ 𝐵) → (𝐵 ⊆ 𝐶 ∧ (𝐴 ∈ V ∧ 𝐶 ∈ 𝑉))) |
| 9 | f1ss 6788 | . . . . 5 ⊢ ((𝑓:𝐴–1-1→𝐵 ∧ 𝐵 ⊆ 𝐶) → 𝑓:𝐴–1-1→𝐶) | |
| 10 | vex 3462 | . . . . . . 7 ⊢ 𝑓 ∈ V | |
| 11 | f1dom4g 8971 | . . . . . . 7 ⊢ (((𝑓 ∈ V ∧ 𝐴 ∈ V ∧ 𝐶 ∈ 𝑉) ∧ 𝑓:𝐴–1-1→𝐶) → 𝐴 ≼ 𝐶) | |
| 12 | 10, 11 | mp3anl1 1484 | . . . . . 6 ⊢ (((𝐴 ∈ V ∧ 𝐶 ∈ 𝑉) ∧ 𝑓:𝐴–1-1→𝐶) → 𝐴 ≼ 𝐶) |
| 13 | 12 | ancoms 464 | . . . . 5 ⊢ ((𝑓:𝐴–1-1→𝐶 ∧ (𝐴 ∈ V ∧ 𝐶 ∈ 𝑉)) → 𝐴 ≼ 𝐶) |
| 14 | 9, 13 | sylan 592 | . . . 4 ⊢ (((𝑓:𝐴–1-1→𝐵 ∧ 𝐵 ⊆ 𝐶) ∧ (𝐴 ∈ V ∧ 𝐶 ∈ 𝑉)) → 𝐴 ≼ 𝐶) |
| 15 | 14 | expl 463 | . . 3 ⊢ (𝑓:𝐴–1-1→𝐵 → ((𝐵 ⊆ 𝐶 ∧ (𝐴 ∈ V ∧ 𝐶 ∈ 𝑉)) → 𝐴 ≼ 𝐶)) |
| 16 | 15 | exlimiv 1963 | . 2 ⊢ (∃𝑓 𝑓:𝐴–1-1→𝐵 → ((𝐵 ⊆ 𝐶 ∧ (𝐴 ∈ V ∧ 𝐶 ∈ 𝑉)) → 𝐴 ≼ 𝐶)) |
| 17 | 2, 8, 16 | sylc 66 | 1 ⊢ ((𝐶 ∈ 𝑉 ∧ 𝐵 ⊆ 𝐶 ∧ 𝐴 ≼ 𝐵) → 𝐴 ≼ 𝐶) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 401 ∧ w3a 1103 ∃wex 1812 ∈ wcel 2146 Vcvv 3458 ⊆ wss 3908 class class class wbr 5114 –1-1→wf1 6540 ≼ cdom 8950 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2148 ax-9 2156 ax-ext 2738 ax-sep 5262 ax-pr 5409 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-sb 2100 df-clab 2745 df-cleq 2758 df-clel 2841 df-ral 3083 df-rex 3093 df-rab 3420 df-v 3460 df-dif 3911 df-un 3913 df-in 3915 df-ss 3925 df-nul 4290 df-if 4493 df-sn 4595 df-pr 4597 df-op 4601 df-br 5115 df-opab 5179 df-xp 5672 df-rel 5673 df-cnv 5674 df-co 5675 df-dm 5676 df-rn 5677 df-fun 6545 df-fn 6546 df-f 6547 df-f1 6548 df-dom 8954 |
| This theorem is used by: 0sdom1dom 9216 rex2dom 9223 |
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