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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 5560 | . . 3 ⊢ (( [⊊] Or 𝐴 ∧ (𝐵 ∈ 𝐴 ∧ 𝐶 ∈ 𝐴)) → (𝐵 [⊊] 𝐶 ∨ 𝐵 = 𝐶 ∨ 𝐶 [⊊] 𝐵)) | |
| 2 | elex 3462 | . . . . . 6 ⊢ (𝐶 ∈ 𝐴 → 𝐶 ∈ V) | |
| 3 | 2 | ad2antll 730 | . . . . 5 ⊢ (( [⊊] Or 𝐴 ∧ (𝐵 ∈ 𝐴 ∧ 𝐶 ∈ 𝐴)) → 𝐶 ∈ V) |
| 4 | brrpssg 7672 | . . . . 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 3462 | . . . . . 6 ⊢ (𝐵 ∈ 𝐴 → 𝐵 ∈ V) | |
| 8 | 7 | ad2antrl 729 | . . . . 5 ⊢ (( [⊊] Or 𝐴 ∧ (𝐵 ∈ 𝐴 ∧ 𝐶 ∈ 𝐴)) → 𝐵 ∈ V) |
| 9 | brrpssg 7672 | . . . . 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 4058 | . 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 3441 ⊆ wss 3902 ⊊ wpss 3903 class class class wbr 5099 Or wor 5532 [⊊] crpss 7669 |
| 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 2709 ax-sep 5242 ax-nul 5252 ax-pr 5378 |
| 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 2716 df-cleq 2729 df-clel 2812 df-ne 2934 df-ral 3053 df-rex 3062 df-rab 3401 df-v 3443 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-pss 3922 df-nul 4287 df-if 4481 df-sn 4582 df-pr 4584 df-op 4588 df-br 5100 df-opab 5162 df-so 5534 df-xp 5631 df-rel 5632 df-rpss 7670 |
| This theorem is referenced by: sorpssun 7677 sorpssin 7678 sorpssuni 7679 sorpssint 7680 sorpsscmpl 7681 enfin2i 10235 fin1a2lem9 10322 fin1a2lem10 10323 fin1a2lem11 10324 fin1a2lem13 10326 ssdifidllem 33518 ssmxidllem 33535 |
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