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| Mirrors > Home > MPE Home > Th. List > sorpssi | Structured version Visualization version GIF version | ||
| Description: Property of a chain of sets. (Contributed by Stefan O'Rear, 2-Nov-2014.) |
| Ref | Expression |
|---|---|
| sorpssi | ⊢ (( [⊊] Or 𝐴 ∧ (𝐵 ∈ 𝐴 ∧ 𝐶 ∈ 𝐴)) → (𝐵 ⊆ 𝐶 ∨ 𝐶 ⊆ 𝐵)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | solin 5566 | . . 3 ⊢ (( [⊊] Or 𝐴 ∧ (𝐵 ∈ 𝐴 ∧ 𝐶 ∈ 𝐴)) → (𝐵 [⊊] 𝐶 ∨ 𝐵 = 𝐶 ∨ 𝐶 [⊊] 𝐵)) | |
| 2 | elex 3450 | . . . . . 6 ⊢ (𝐶 ∈ 𝐴 → 𝐶 ∈ V) | |
| 3 | 2 | ad2antll 730 | . . . . 5 ⊢ (( [⊊] Or 𝐴 ∧ (𝐵 ∈ 𝐴 ∧ 𝐶 ∈ 𝐴)) → 𝐶 ∈ V) |
| 4 | brrpssg 7679 | . . . . 5 ⊢ (𝐶 ∈ V → (𝐵 [⊊] 𝐶 ↔ 𝐵 ⊊ 𝐶)) | |
| 5 | 3, 4 | syl 17 | . . . 4 ⊢ (( [⊊] Or 𝐴 ∧ (𝐵 ∈ 𝐴 ∧ 𝐶 ∈ 𝐴)) → (𝐵 [⊊] 𝐶 ↔ 𝐵 ⊊ 𝐶)) |
| 6 | biidd 262 | . . . 4 ⊢ (( [⊊] Or 𝐴 ∧ (𝐵 ∈ 𝐴 ∧ 𝐶 ∈ 𝐴)) → (𝐵 = 𝐶 ↔ 𝐵 = 𝐶)) | |
| 7 | elex 3450 | . . . . . 6 ⊢ (𝐵 ∈ 𝐴 → 𝐵 ∈ V) | |
| 8 | 7 | ad2antrl 729 | . . . . 5 ⊢ (( [⊊] Or 𝐴 ∧ (𝐵 ∈ 𝐴 ∧ 𝐶 ∈ 𝐴)) → 𝐵 ∈ V) |
| 9 | brrpssg 7679 | . . . . 5 ⊢ (𝐵 ∈ V → (𝐶 [⊊] 𝐵 ↔ 𝐶 ⊊ 𝐵)) | |
| 10 | 8, 9 | syl 17 | . . . 4 ⊢ (( [⊊] Or 𝐴 ∧ (𝐵 ∈ 𝐴 ∧ 𝐶 ∈ 𝐴)) → (𝐶 [⊊] 𝐵 ↔ 𝐶 ⊊ 𝐵)) |
| 11 | 5, 6, 10 | 3orbi123d 1438 | . . 3 ⊢ (( [⊊] Or 𝐴 ∧ (𝐵 ∈ 𝐴 ∧ 𝐶 ∈ 𝐴)) → ((𝐵 [⊊] 𝐶 ∨ 𝐵 = 𝐶 ∨ 𝐶 [⊊] 𝐵) ↔ (𝐵 ⊊ 𝐶 ∨ 𝐵 = 𝐶 ∨ 𝐶 ⊊ 𝐵))) |
| 12 | 1, 11 | mpbid 232 | . 2 ⊢ (( [⊊] Or 𝐴 ∧ (𝐵 ∈ 𝐴 ∧ 𝐶 ∈ 𝐴)) → (𝐵 ⊊ 𝐶 ∨ 𝐵 = 𝐶 ∨ 𝐶 ⊊ 𝐵)) |
| 13 | sspsstri 4045 | . 2 ⊢ ((𝐵 ⊆ 𝐶 ∨ 𝐶 ⊆ 𝐵) ↔ (𝐵 ⊊ 𝐶 ∨ 𝐵 = 𝐶 ∨ 𝐶 ⊊ 𝐵)) | |
| 14 | 12, 13 | sylibr 234 | 1 ⊢ (( [⊊] Or 𝐴 ∧ (𝐵 ∈ 𝐴 ∧ 𝐶 ∈ 𝐴)) → (𝐵 ⊆ 𝐶 ∨ 𝐶 ⊆ 𝐵)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 206 ∧ wa 395 ∨ wo 848 ∨ w3o 1086 = wceq 1542 ∈ wcel 2114 Vcvv 3429 ⊆ wss 3889 ⊊ wpss 3890 class class class wbr 5085 Or wor 5538 [⊊] crpss 7676 |
| 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 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-ext 2708 ax-sep 5231 ax-pr 5375 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-sb 2069 df-clab 2715 df-cleq 2728 df-clel 2811 df-ne 2933 df-ral 3052 df-rex 3062 df-rab 3390 df-v 3431 df-dif 3892 df-un 3894 df-in 3896 df-ss 3906 df-pss 3909 df-nul 4274 df-if 4467 df-sn 4568 df-pr 4570 df-op 4574 df-br 5086 df-opab 5148 df-so 5540 df-xp 5637 df-rel 5638 df-rpss 7677 |
| This theorem is referenced by: sorpssun 7684 sorpssin 7685 sorpssuni 7686 sorpssint 7687 sorpsscmpl 7688 enfin2i 10243 fin1a2lem9 10330 fin1a2lem10 10331 fin1a2lem11 10332 fin1a2lem13 10334 ssdifidllem 33516 ssmxidllem 33533 |
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