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Theorem rr-phpd 45350
Description: Equivalent of php 9236 without negation. (Contributed by Rohan Ridenour, 3-Aug-2023.)
Hypotheses
Ref Expression
rr-phpd.1 (𝜑 → 𝐴 ∈ ω)
rr-phpd.2 (𝜑 → 𝐵 ⊆ 𝐴)
rr-phpd.3 (𝜑 → 𝐴 ≈ 𝐵)
Assertion
Ref Expression
rr-phpd (𝜑 → 𝐴 = 𝐵)

Proof of Theorem rr-phpd
StepHypRef Expression
1 rr-phpd.3 . 2 (𝜑 → 𝐴 ≈ 𝐵)
2 rr-phpd.1 . . . 4 (𝜑 → 𝐴 ∈ ω)
3 rr-phpd.2 . . . . . 6 (𝜑 → 𝐵 ⊆ 𝐴)
43adantr 486 . . . . 5 ((𝜑 ∧ ¬ 𝐴 = 𝐵) → 𝐵 ⊆ 𝐴)
5 simpr 490 . . . . . 6 ((𝜑 ∧ ¬ 𝐴 = 𝐵) → ¬ 𝐴 = 𝐵)
65neqcomd 2773 . . . . 5 ((𝜑 ∧ ¬ 𝐴 = 𝐵) → ¬ 𝐵 = 𝐴)
7 dfpss2 4018 . . . . 5 (𝐵 ⊊ 𝐴 ↔ (𝐵 ⊆ 𝐴 ∧ ¬ 𝐵 = 𝐴))
84, 6, 7sylanbrc 595 . . . 4 ((𝜑 ∧ ¬ 𝐴 = 𝐵) → 𝐵 ⊊ 𝐴)
9 php 9236 . . . 4 ((𝐴 ∈ ω ∧ 𝐵 ⊊ 𝐴) → ¬ 𝐴 ≈ 𝐵)
102, 8, 9syl2an2r 698 . . 3 ((𝜑 ∧ ¬ 𝐴 = 𝐵) → ¬ 𝐴 ≈ 𝐵)
1110ex 418 . 2 (𝜑 → (¬ 𝐴 = 𝐵 → ¬ 𝐴 ≈ 𝐵))
121, 11mt4d 118 1 (𝜑 → 𝐴 = 𝐵)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  ¬ wn 3   → wi 4   ∧ wa 401   = wceq 1569   ∈ wcel 2146   ⊆ wss 3900   ⊊ wpss 4016   class class class wbr 5106  ωcom 7887   ≈ cen 8984
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1827  ax-4 1841  ax-5 1944  ax-6 2001  ax-7 2042  ax-8 2148  ax-9 2156  ax-10 2179  ax-11 2196  ax-12 2215  ax-ext 2735  ax-sep 5252  ax-nul 5263  ax-pr 5395  ax-un 7761
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3or 1104  df-3an 1105  df-tru 1572  df-fal 1582  df-ex 1812  df-nf 1816  df-sb 2101  df-mo 2567  df-eu 2597  df-clab 2742  df-cleq 2755  df-clel 2839  df-nfc 2913  df-ne 2960  df-ral 3081  df-rex 3091  df-reu 3370  df-rab 3417  df-v 3456  df-sbc 3743  df-csb 3852  df-ss 3901  df-pss 4017  df-dif 4050  df-in 4094  df-un 4154  df-nul 4282  df-if 4486  df-pw 4562  df-sn 4589  df-pr 4591  df-op 4839  df-uni 4871  df-br 5107  df-opab 5171  df-mpt 5190  df-tr 5216  df-id 5550  df-eprel 5555  df-po 5563  df-so 5564  df-fr 5608  df-we 5610  df-xp 5661  df-rel 5662  df-cnv 5663  df-co 5664  df-dm 5665  df-rn 5666  df-res 5667  df-ima 5668  df-ord 6372  df-on 6373  df-lim 6374  df-suc 6375  df-iota 6501  df-fun 6549  df-fn 6550  df-f 6551  df-f1 6552  df-fo 6553  df-f1o 6554  df-fv 6555  df-om 7888  df-1o 8490  df-en 8988  df-dom 8989  df-fin 8991
This theorem is used by: (None)
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