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Theorem somo 5034
Description: A totally ordered set has at most one minimal element. (Contributed by Mario Carneiro, 24-Jun-2015.) (Revised by NM, 16-Jun-2017.)
Assertion
Ref Expression
somo (𝑅 Or 𝐴 → ∃*𝑥𝐴𝑦𝐴 ¬ 𝑦𝑅𝑥)
Distinct variable groups:   𝑥,𝑦,𝐴   𝑥,𝑅,𝑦

Proof of Theorem somo
Dummy variable 𝑧 is distinct from all other variables.
StepHypRef Expression
1 breq1 4621 . . . . . . . . . . 11 (𝑦 = 𝑥 → (𝑦𝑅𝑧𝑥𝑅𝑧))
21notbid 308 . . . . . . . . . 10 (𝑦 = 𝑥 → (¬ 𝑦𝑅𝑧 ↔ ¬ 𝑥𝑅𝑧))
32rspcv 3294 . . . . . . . . 9 (𝑥𝐴 → (∀𝑦𝐴 ¬ 𝑦𝑅𝑧 → ¬ 𝑥𝑅𝑧))
4 breq1 4621 . . . . . . . . . . 11 (𝑦 = 𝑧 → (𝑦𝑅𝑥𝑧𝑅𝑥))
54notbid 308 . . . . . . . . . 10 (𝑦 = 𝑧 → (¬ 𝑦𝑅𝑥 ↔ ¬ 𝑧𝑅𝑥))
65rspcv 3294 . . . . . . . . 9 (𝑧𝐴 → (∀𝑦𝐴 ¬ 𝑦𝑅𝑥 → ¬ 𝑧𝑅𝑥))
73, 6im2anan9 879 . . . . . . . 8 ((𝑥𝐴𝑧𝐴) → ((∀𝑦𝐴 ¬ 𝑦𝑅𝑧 ∧ ∀𝑦𝐴 ¬ 𝑦𝑅𝑥) → (¬ 𝑥𝑅𝑧 ∧ ¬ 𝑧𝑅𝑥)))
87ancomsd 470 . . . . . . 7 ((𝑥𝐴𝑧𝐴) → ((∀𝑦𝐴 ¬ 𝑦𝑅𝑥 ∧ ∀𝑦𝐴 ¬ 𝑦𝑅𝑧) → (¬ 𝑥𝑅𝑧 ∧ ¬ 𝑧𝑅𝑥)))
98imp 445 . . . . . 6 (((𝑥𝐴𝑧𝐴) ∧ (∀𝑦𝐴 ¬ 𝑦𝑅𝑥 ∧ ∀𝑦𝐴 ¬ 𝑦𝑅𝑧)) → (¬ 𝑥𝑅𝑧 ∧ ¬ 𝑧𝑅𝑥))
10 ioran 511 . . . . . . 7 (¬ (𝑥𝑅𝑧𝑧𝑅𝑥) ↔ (¬ 𝑥𝑅𝑧 ∧ ¬ 𝑧𝑅𝑥))
11 solin 5023 . . . . . . . . . 10 ((𝑅 Or 𝐴 ∧ (𝑥𝐴𝑧𝐴)) → (𝑥𝑅𝑧𝑥 = 𝑧𝑧𝑅𝑥))
12 df-3or 1037 . . . . . . . . . 10 ((𝑥𝑅𝑧𝑥 = 𝑧𝑧𝑅𝑥) ↔ ((𝑥𝑅𝑧𝑥 = 𝑧) ∨ 𝑧𝑅𝑥))
1311, 12sylib 208 . . . . . . . . 9 ((𝑅 Or 𝐴 ∧ (𝑥𝐴𝑧𝐴)) → ((𝑥𝑅𝑧𝑥 = 𝑧) ∨ 𝑧𝑅𝑥))
14 or32 549 . . . . . . . . 9 (((𝑥𝑅𝑧𝑥 = 𝑧) ∨ 𝑧𝑅𝑥) ↔ ((𝑥𝑅𝑧𝑧𝑅𝑥) ∨ 𝑥 = 𝑧))
1513, 14sylib 208 . . . . . . . 8 ((𝑅 Or 𝐴 ∧ (𝑥𝐴𝑧𝐴)) → ((𝑥𝑅𝑧𝑧𝑅𝑥) ∨ 𝑥 = 𝑧))
1615ord 392 . . . . . . 7 ((𝑅 Or 𝐴 ∧ (𝑥𝐴𝑧𝐴)) → (¬ (𝑥𝑅𝑧𝑧𝑅𝑥) → 𝑥 = 𝑧))
1710, 16syl5bir 233 . . . . . 6 ((𝑅 Or 𝐴 ∧ (𝑥𝐴𝑧𝐴)) → ((¬ 𝑥𝑅𝑧 ∧ ¬ 𝑧𝑅𝑥) → 𝑥 = 𝑧))
189, 17syl5 34 . . . . 5 ((𝑅 Or 𝐴 ∧ (𝑥𝐴𝑧𝐴)) → (((𝑥𝐴𝑧𝐴) ∧ (∀𝑦𝐴 ¬ 𝑦𝑅𝑥 ∧ ∀𝑦𝐴 ¬ 𝑦𝑅𝑧)) → 𝑥 = 𝑧))
1918exp4b 631 . . . 4 (𝑅 Or 𝐴 → ((𝑥𝐴𝑧𝐴) → ((𝑥𝐴𝑧𝐴) → ((∀𝑦𝐴 ¬ 𝑦𝑅𝑥 ∧ ∀𝑦𝐴 ¬ 𝑦𝑅𝑧) → 𝑥 = 𝑧))))
2019pm2.43d 53 . . 3 (𝑅 Or 𝐴 → ((𝑥𝐴𝑧𝐴) → ((∀𝑦𝐴 ¬ 𝑦𝑅𝑥 ∧ ∀𝑦𝐴 ¬ 𝑦𝑅𝑧) → 𝑥 = 𝑧)))
2120ralrimivv 2965 . 2 (𝑅 Or 𝐴 → ∀𝑥𝐴𝑧𝐴 ((∀𝑦𝐴 ¬ 𝑦𝑅𝑥 ∧ ∀𝑦𝐴 ¬ 𝑦𝑅𝑧) → 𝑥 = 𝑧))
22 breq2 4622 . . . . 5 (𝑥 = 𝑧 → (𝑦𝑅𝑥𝑦𝑅𝑧))
2322notbid 308 . . . 4 (𝑥 = 𝑧 → (¬ 𝑦𝑅𝑥 ↔ ¬ 𝑦𝑅𝑧))
2423ralbidv 2981 . . 3 (𝑥 = 𝑧 → (∀𝑦𝐴 ¬ 𝑦𝑅𝑥 ↔ ∀𝑦𝐴 ¬ 𝑦𝑅𝑧))
2524rmo4 3385 . 2 (∃*𝑥𝐴𝑦𝐴 ¬ 𝑦𝑅𝑥 ↔ ∀𝑥𝐴𝑧𝐴 ((∀𝑦𝐴 ¬ 𝑦𝑅𝑥 ∧ ∀𝑦𝐴 ¬ 𝑦𝑅𝑧) → 𝑥 = 𝑧))
2621, 25sylibr 224 1 (𝑅 Or 𝐴 → ∃*𝑥𝐴𝑦𝐴 ¬ 𝑦𝑅𝑥)
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wo 383  wa 384  w3o 1035  wcel 1987  wral 2907  ∃*wrmo 2910   class class class wbr 4618   Or wor 4999
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1719  ax-4 1734  ax-5 1836  ax-6 1885  ax-7 1932  ax-9 1996  ax-10 2016  ax-11 2031  ax-12 2044  ax-13 2245  ax-ext 2601
This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1037  df-3an 1038  df-tru 1483  df-ex 1702  df-nf 1707  df-sb 1878  df-eu 2473  df-mo 2474  df-clab 2608  df-cleq 2614  df-clel 2617  df-nfc 2750  df-ral 2912  df-rmo 2915  df-rab 2916  df-v 3191  df-dif 3562  df-un 3564  df-in 3566  df-ss 3573  df-nul 3897  df-if 4064  df-sn 4154  df-pr 4156  df-op 4160  df-br 4619  df-so 5001
This theorem is referenced by:  wereu  5075  wereu2  5076
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