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Theorem pw1ndom3lem 16812
Description: Lemma for pw1ndom3 16813. (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 3682 . . 3 (𝜑𝑋 ⊆ 1o)
3 df1o2 6663 . . 3 1o = {∅}
42, 3sseqtrdi 3288 . 2 (𝜑𝑋 ⊆ {∅})
5 pw1ndom3lem.y . . . . . . . . . 10 (𝜑𝑌 ∈ 𝒫 1o)
65elpwid 3682 . . . . . . . . 9 (𝜑𝑌 ⊆ 1o)
76adantr 276 . . . . . . . 8 ((𝜑𝑋 = 1o) → 𝑌 ⊆ 1o)
87, 3sseqtrdi 3288 . . . . . . 7 ((𝜑𝑋 = 1o) → 𝑌 ⊆ {∅})
9 pw1ndom3lem.xy . . . . . . . . . . 11 (𝜑𝑋𝑌)
109adantr 276 . . . . . . . . . 10 ((𝜑𝑋 = 1o) → 𝑋𝑌)
11 neeq1 2427 . . . . . . . . . . 11 (𝑋 = 1o → (𝑋𝑌 ↔ 1o𝑌))
1211adantl 277 . . . . . . . . . 10 ((𝜑𝑋 = 1o) → (𝑋𝑌 ↔ 1o𝑌))
1310, 12mpbid 147 . . . . . . . . 9 ((𝜑𝑋 = 1o) → 1o𝑌)
1413necomd 2500 . . . . . . . 8 ((𝜑𝑋 = 1o) → 𝑌 ≠ 1o)
153a1i 9 . . . . . . . 8 ((𝜑𝑋 = 1o) → 1o = {∅})
1614, 15neeqtrd 2442 . . . . . . 7 ((𝜑𝑋 = 1o) → 𝑌 ≠ {∅})
17 pwntru 4314 . . . . . . 7 ((𝑌 ⊆ {∅} ∧ 𝑌 ≠ {∅}) → 𝑌 = ∅)
188, 16, 17syl2anc 411 . . . . . 6 ((𝜑𝑋 = 1o) → 𝑌 = ∅)
19 pw1ndom3lem.z . . . . . . . . . 10 (𝜑𝑍 ∈ 𝒫 1o)
2019elpwid 3682 . . . . . . . . 9 (𝜑𝑍 ⊆ 1o)
2120adantr 276 . . . . . . . 8 ((𝜑𝑋 = 1o) → 𝑍 ⊆ 1o)
2221, 3sseqtrdi 3288 . . . . . . 7 ((𝜑𝑋 = 1o) → 𝑍 ⊆ {∅})
23 pw1ndom3lem.xz . . . . . . . . . . 11 (𝜑𝑋𝑍)
2423adantr 276 . . . . . . . . . 10 ((𝜑𝑋 = 1o) → 𝑋𝑍)
25 neeq1 2427 . . . . . . . . . . 11 (𝑋 = 1o → (𝑋𝑍 ↔ 1o𝑍))
2625adantl 277 . . . . . . . . . 10 ((𝜑𝑋 = 1o) → (𝑋𝑍 ↔ 1o𝑍))
2724, 26mpbid 147 . . . . . . . . 9 ((𝜑𝑋 = 1o) → 1o𝑍)
2827necomd 2500 . . . . . . . 8 ((𝜑𝑋 = 1o) → 𝑍 ≠ 1o)
2928, 15neeqtrd 2442 . . . . . . 7 ((𝜑𝑋 = 1o) → 𝑍 ≠ {∅})
30 pwntru 4314 . . . . . . 7 ((𝑍 ⊆ {∅} ∧ 𝑍 ≠ {∅}) → 𝑍 = ∅)
3122, 29, 30syl2anc 411 . . . . . 6 ((𝜑𝑋 = 1o) → 𝑍 = ∅)
3218, 31eqtr4d 2270 . . . . 5 ((𝜑𝑋 = 1o) → 𝑌 = 𝑍)
33 pw1ndom3lem.yz . . . . . . 7 (𝜑𝑌𝑍)
3433adantr 276 . . . . . 6 ((𝜑𝑋 = 1o) → 𝑌𝑍)
3534neneqd 2435 . . . . 5 ((𝜑𝑋 = 1o) → ¬ 𝑌 = 𝑍)
3632, 35pm2.65da 667 . . . 4 (𝜑 → ¬ 𝑋 = 1o)
3736neqned 2421 . . 3 (𝜑𝑋 ≠ 1o)
383a1i 9 . . 3 (𝜑 → 1o = {∅})
3937, 38neeqtrd 2442 . 2 (𝜑𝑋 ≠ {∅})
40 pwntru 4314 . 2 ((𝑋 ⊆ {∅} ∧ 𝑋 ≠ {∅}) → 𝑋 = ∅)
414, 39, 40syl2anc 411 1 (𝜑𝑋 = ∅)
Colors of variables: wff set class
Syntax hints:  wi 4  wa 104  wb 105   = wceq 1398  wcel 2205  wne 2414  wss 3213  c0 3510  𝒫 cpw 3671  {csn 3691  1oc1o 6642
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 619  ax-in2 620  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-ext 2216
This theorem depends on definitions:  df-bi 117  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1812  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ne 2415  df-v 2817  df-dif 3215  df-un 3217  df-in 3219  df-ss 3226  df-nul 3511  df-pw 3673  df-sn 3697  df-suc 4494  df-1o 6649
This theorem is referenced by:  pw1ndom3  16813
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