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Theorem pw1ndom3lem 17002
Description: Lemma for pw1ndom3 17003. (Contributed by Jim Kingdon, 14-Feb-2026.)
Hypotheses
Ref Expression
pw1ndom3lem.x (𝜑𝑋 ∈ 𝒫 1o)
pw1ndom3lem.y (𝜑𝑌 ∈ 𝒫 1o)
pw1ndom3lem.z (𝜑𝑍 ∈ 𝒫 1o)
pw1ndom3lem.xy (𝜑𝑋𝑌)
pw1ndom3lem.xz (𝜑𝑋𝑍)
pw1ndom3lem.yz (𝜑𝑌𝑍)
Assertion
Ref Expression
pw1ndom3lem (𝜑𝑋 = ∅)

Proof of Theorem pw1ndom3lem
StepHypRef Expression
1 pw1ndom3lem.x . . . 4 (𝜑𝑋 ∈ 𝒫 1o)
21elpwid 3699 . . 3 (𝜑𝑋 ⊆ 1o)
3 df1o2 6695 . . 3 1o = {∅}
42, 3sseqtrdi 3296 . 2 (𝜑𝑋 ⊆ {∅})
5 pw1ndom3lem.y . . . . . . . . . 10 (𝜑𝑌 ∈ 𝒫 1o)
65elpwid 3699 . . . . . . . . 9 (𝜑𝑌 ⊆ 1o)
76adantr 276 . . . . . . . 8 ((𝜑𝑋 = 1o) → 𝑌 ⊆ 1o)
87, 3sseqtrdi 3296 . . . . . . 7 ((𝜑𝑋 = 1o) → 𝑌 ⊆ {∅})
9 pw1ndom3lem.xy . . . . . . . . . . 11 (𝜑𝑋𝑌)
109adantr 276 . . . . . . . . . 10 ((𝜑𝑋 = 1o) → 𝑋𝑌)
11 neeq1 2433 . . . . . . . . . . 11 (𝑋 = 1o → (𝑋𝑌 ↔ 1o𝑌))
1211adantl 277 . . . . . . . . . 10 ((𝜑𝑋 = 1o) → (𝑋𝑌 ↔ 1o𝑌))
1310, 12mpbid 147 . . . . . . . . 9 ((𝜑𝑋 = 1o) → 1o𝑌)
1413necomd 2506 . . . . . . . 8 ((𝜑𝑋 = 1o) → 𝑌 ≠ 1o)
153a1i 9 . . . . . . . 8 ((𝜑𝑋 = 1o) → 1o = {∅})
1614, 15neeqtrd 2448 . . . . . . 7 ((𝜑𝑋 = 1o) → 𝑌 ≠ {∅})
17 pwntru 4334 . . . . . . 7 ((𝑌 ⊆ {∅} ∧ 𝑌 ≠ {∅}) → 𝑌 = ∅)
188, 16, 17syl2anc 415 . . . . . 6 ((𝜑𝑋 = 1o) → 𝑌 = ∅)
19 pw1ndom3lem.z . . . . . . . . . 10 (𝜑𝑍 ∈ 𝒫 1o)
2019elpwid 3699 . . . . . . . . 9 (𝜑𝑍 ⊆ 1o)
2120adantr 276 . . . . . . . 8 ((𝜑𝑋 = 1o) → 𝑍 ⊆ 1o)
2221, 3sseqtrdi 3296 . . . . . . 7 ((𝜑𝑋 = 1o) → 𝑍 ⊆ {∅})
23 pw1ndom3lem.xz . . . . . . . . . . 11 (𝜑𝑋𝑍)
2423adantr 276 . . . . . . . . . 10 ((𝜑𝑋 = 1o) → 𝑋𝑍)
25 neeq1 2433 . . . . . . . . . . 11 (𝑋 = 1o → (𝑋𝑍 ↔ 1o𝑍))
2625adantl 277 . . . . . . . . . 10 ((𝜑𝑋 = 1o) → (𝑋𝑍 ↔ 1o𝑍))
2724, 26mpbid 147 . . . . . . . . 9 ((𝜑𝑋 = 1o) → 1o𝑍)
2827necomd 2506 . . . . . . . 8 ((𝜑𝑋 = 1o) → 𝑍 ≠ 1o)
2928, 15neeqtrd 2448 . . . . . . 7 ((𝜑𝑋 = 1o) → 𝑍 ≠ {∅})
30 pwntru 4334 . . . . . . 7 ((𝑍 ⊆ {∅} ∧ 𝑍 ≠ {∅}) → 𝑍 = ∅)
3122, 29, 30syl2anc 415 . . . . . 6 ((𝜑𝑋 = 1o) → 𝑍 = ∅)
3218, 31eqtr4d 2274 . . . . 5 ((𝜑𝑋 = 1o) → 𝑌 = 𝑍)
33 pw1ndom3lem.yz . . . . . . 7 (𝜑𝑌𝑍)
3433adantr 276 . . . . . 6 ((𝜑𝑋 = 1o) → 𝑌𝑍)
3534neneqd 2441 . . . . 5 ((𝜑𝑋 = 1o) → ¬ 𝑌 = 𝑍)
3632, 35pm2.65da 671 . . . 4 (𝜑 → ¬ 𝑋 = 1o)
3736neqned 2427 . . 3 (𝜑𝑋 ≠ 1o)
383a1i 9 . . 3 (𝜑 → 1o = {∅})
3937, 38neeqtrd 2448 . 2 (𝜑𝑋 ≠ {∅})
40 pwntru 4334 . 2 ((𝑋 ⊆ {∅} ∧ 𝑋 ≠ {∅}) → 𝑋 = ∅)
414, 39, 40syl2anc 415 1 (𝜑𝑋 = ∅)
Colors of variables: wff set class
Syntax hints:  wi 4  wa 104  wb 105   = wceq 1402  wcel 2209  wne 2420  wss 3220  c0 3520  𝒫 cpw 3688  {csn 3708  1oc1o 6674
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 623  ax-in2 624  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-ext 2220
This theorem depends on definitions:  df-bi 117  df-tru 1405  df-fal 1408  df-nf 1514  df-sb 1816  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ne 2421  df-v 2823  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-nul 3521  df-pw 3690  df-sn 3714  df-suc 4514  df-1o 6681
This theorem is referenced by:  pw1ndom3  17003
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