Users' Mathboxes Mathbox for Wolf Lammen < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  MPE Home  >  Th. List  >   Mathboxes  >  wl-ax11-lem8 Structured version   Visualization version   GIF version

Theorem wl-ax11-lem8 33703
Description: Lemma. (Contributed by Wolf Lammen, 30-Jun-2019.)
Assertion
Ref Expression
wl-ax11-lem8 ((∀𝑢 𝑢 = 𝑦 ∧ ¬ ∀𝑥 𝑥 = 𝑦) → (∀𝑢𝑥[𝑢 / 𝑦]𝜑 ↔ ∀𝑦𝑥𝜑))
Distinct variable group:   𝑥,𝑢
Allowed substitution hints:   𝜑(𝑥,𝑦,𝑢)

Proof of Theorem wl-ax11-lem8
StepHypRef Expression
1 axc11n 2462 . . 3 (∀𝑦 𝑦 = 𝑥 → ∀𝑥 𝑥 = 𝑦)
21con3i 151 . 2 (¬ ∀𝑥 𝑥 = 𝑦 → ¬ ∀𝑦 𝑦 = 𝑥)
3 wl-ax11-lem1 33696 . . . . . . 7 (∀𝑢 𝑢 = 𝑦 → (∀𝑢 𝑢 = 𝑥 ↔ ∀𝑦 𝑦 = 𝑥))
43notbid 307 . . . . . 6 (∀𝑢 𝑢 = 𝑦 → (¬ ∀𝑢 𝑢 = 𝑥 ↔ ¬ ∀𝑦 𝑦 = 𝑥))
54anbi1d 615 . . . . 5 (∀𝑢 𝑢 = 𝑦 → ((¬ ∀𝑢 𝑢 = 𝑥 ∧ ∀𝑢𝑥[𝑢 / 𝑦]𝜑) ↔ (¬ ∀𝑦 𝑦 = 𝑥 ∧ ∀𝑢𝑥[𝑢 / 𝑦]𝜑)))
64anbi1d 615 . . . . . . . 8 (∀𝑢 𝑢 = 𝑦 → ((¬ ∀𝑢 𝑢 = 𝑥 ∧ ∀𝑥[𝑢 / 𝑦]𝜑) ↔ (¬ ∀𝑦 𝑦 = 𝑥 ∧ ∀𝑥[𝑢 / 𝑦]𝜑)))
7 axc11n 2462 . . . . . . . . . . 11 (∀𝑥 𝑥 = 𝑦 → ∀𝑦 𝑦 = 𝑥)
87con3i 151 . . . . . . . . . 10 (¬ ∀𝑦 𝑦 = 𝑥 → ¬ ∀𝑥 𝑥 = 𝑦)
9 wl-ax11-lem4 33699 . . . . . . . . . . . 12 𝑥(∀𝑢 𝑢 = 𝑦 ∧ ¬ ∀𝑥 𝑥 = 𝑦)
10 sbequ12 2267 . . . . . . . . . . . . . . 15 (𝑦 = 𝑢 → (𝜑 ↔ [𝑢 / 𝑦]𝜑))
1110equcoms 2105 . . . . . . . . . . . . . 14 (𝑢 = 𝑦 → (𝜑 ↔ [𝑢 / 𝑦]𝜑))
1211sps 2209 . . . . . . . . . . . . 13 (∀𝑢 𝑢 = 𝑦 → (𝜑 ↔ [𝑢 / 𝑦]𝜑))
1312adantr 466 . . . . . . . . . . . 12 ((∀𝑢 𝑢 = 𝑦 ∧ ¬ ∀𝑥 𝑥 = 𝑦) → (𝜑 ↔ [𝑢 / 𝑦]𝜑))
149, 13albid 2246 . . . . . . . . . . 11 ((∀𝑢 𝑢 = 𝑦 ∧ ¬ ∀𝑥 𝑥 = 𝑦) → (∀𝑥𝜑 ↔ ∀𝑥[𝑢 / 𝑦]𝜑))
1514ex 397 . . . . . . . . . 10 (∀𝑢 𝑢 = 𝑦 → (¬ ∀𝑥 𝑥 = 𝑦 → (∀𝑥𝜑 ↔ ∀𝑥[𝑢 / 𝑦]𝜑)))
168, 15syl5 34 . . . . . . . . 9 (∀𝑢 𝑢 = 𝑦 → (¬ ∀𝑦 𝑦 = 𝑥 → (∀𝑥𝜑 ↔ ∀𝑥[𝑢 / 𝑦]𝜑)))
1716pm5.32d 566 . . . . . . . 8 (∀𝑢 𝑢 = 𝑦 → ((¬ ∀𝑦 𝑦 = 𝑥 ∧ ∀𝑥𝜑) ↔ (¬ ∀𝑦 𝑦 = 𝑥 ∧ ∀𝑥[𝑢 / 𝑦]𝜑)))
186, 17bitr4d 271 . . . . . . 7 (∀𝑢 𝑢 = 𝑦 → ((¬ ∀𝑢 𝑢 = 𝑥 ∧ ∀𝑥[𝑢 / 𝑦]𝜑) ↔ (¬ ∀𝑦 𝑦 = 𝑥 ∧ ∀𝑥𝜑)))
1918dral1 2475 . . . . . 6 (∀𝑢 𝑢 = 𝑦 → (∀𝑢(¬ ∀𝑢 𝑢 = 𝑥 ∧ ∀𝑥[𝑢 / 𝑦]𝜑) ↔ ∀𝑦(¬ ∀𝑦 𝑦 = 𝑥 ∧ ∀𝑥𝜑)))
20 wl-ax11-lem7 33702 . . . . . 6 (∀𝑢(¬ ∀𝑢 𝑢 = 𝑥 ∧ ∀𝑥[𝑢 / 𝑦]𝜑) ↔ (¬ ∀𝑢 𝑢 = 𝑥 ∧ ∀𝑢𝑥[𝑢 / 𝑦]𝜑))
21 wl-ax11-lem7 33702 . . . . . 6 (∀𝑦(¬ ∀𝑦 𝑦 = 𝑥 ∧ ∀𝑥𝜑) ↔ (¬ ∀𝑦 𝑦 = 𝑥 ∧ ∀𝑦𝑥𝜑))
2219, 20, 213bitr3g 302 . . . . 5 (∀𝑢 𝑢 = 𝑦 → ((¬ ∀𝑢 𝑢 = 𝑥 ∧ ∀𝑢𝑥[𝑢 / 𝑦]𝜑) ↔ (¬ ∀𝑦 𝑦 = 𝑥 ∧ ∀𝑦𝑥𝜑)))
235, 22bitr3d 270 . . . 4 (∀𝑢 𝑢 = 𝑦 → ((¬ ∀𝑦 𝑦 = 𝑥 ∧ ∀𝑢𝑥[𝑢 / 𝑦]𝜑) ↔ (¬ ∀𝑦 𝑦 = 𝑥 ∧ ∀𝑦𝑥𝜑)))
24 pm5.32 563 . . . 4 ((¬ ∀𝑦 𝑦 = 𝑥 → (∀𝑢𝑥[𝑢 / 𝑦]𝜑 ↔ ∀𝑦𝑥𝜑)) ↔ ((¬ ∀𝑦 𝑦 = 𝑥 ∧ ∀𝑢𝑥[𝑢 / 𝑦]𝜑) ↔ (¬ ∀𝑦 𝑦 = 𝑥 ∧ ∀𝑦𝑥𝜑)))
2523, 24sylibr 224 . . 3 (∀𝑢 𝑢 = 𝑦 → (¬ ∀𝑦 𝑦 = 𝑥 → (∀𝑢𝑥[𝑢 / 𝑦]𝜑 ↔ ∀𝑦𝑥𝜑)))
2625imp 393 . 2 ((∀𝑢 𝑢 = 𝑦 ∧ ¬ ∀𝑦 𝑦 = 𝑥) → (∀𝑢𝑥[𝑢 / 𝑦]𝜑 ↔ ∀𝑦𝑥𝜑))
272, 26sylan2 580 1 ((∀𝑢 𝑢 = 𝑦 ∧ ¬ ∀𝑥 𝑥 = 𝑦) → (∀𝑢𝑥[𝑢 / 𝑦]𝜑 ↔ ∀𝑦𝑥𝜑))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 196  wa 382  wal 1629  [wsb 2049
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1870  ax-4 1885  ax-5 1991  ax-6 2057  ax-7 2093  ax-10 2174  ax-12 2203  ax-13 2408  ax-wl-11v 33695
This theorem depends on definitions:  df-bi 197  df-an 383  df-or 837  df-tru 1634  df-ex 1853  df-nf 1858  df-sb 2050
This theorem is referenced by:  wl-ax11-lem10  33705
  Copyright terms: Public domain W3C validator