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Theorem rr-phpd 42055
Description: Equivalent of php 9054 without negation. (Contributed by Rohan Ridenour, 3-Aug-2023.)
Hypotheses
Ref Expression
rr-phpd.1 (𝜑𝐴 ∈ ω)
rr-phpd.2 (𝜑𝐵𝐴)
rr-phpd.3 (𝜑𝐴𝐵)
Assertion
Ref Expression
rr-phpd (𝜑𝐴 = 𝐵)

Proof of Theorem rr-phpd
StepHypRef Expression
1 rr-phpd.3 . 2 (𝜑𝐴𝐵)
2 rr-phpd.1 . . . 4 (𝜑𝐴 ∈ ω)
3 rr-phpd.2 . . . . . 6 (𝜑𝐵𝐴)
43adantr 481 . . . . 5 ((𝜑 ∧ ¬ 𝐴 = 𝐵) → 𝐵𝐴)
5 simpr 485 . . . . . 6 ((𝜑 ∧ ¬ 𝐴 = 𝐵) → ¬ 𝐴 = 𝐵)
65neqcomd 2747 . . . . 5 ((𝜑 ∧ ¬ 𝐴 = 𝐵) → ¬ 𝐵 = 𝐴)
7 dfpss2 4031 . . . . 5 (𝐵𝐴 ↔ (𝐵𝐴 ∧ ¬ 𝐵 = 𝐴))
84, 6, 7sylanbrc 583 . . . 4 ((𝜑 ∧ ¬ 𝐴 = 𝐵) → 𝐵𝐴)
9 php 9054 . . . 4 ((𝐴 ∈ ω ∧ 𝐵𝐴) → ¬ 𝐴𝐵)
102, 8, 9syl2an2r 682 . . 3 ((𝜑 ∧ ¬ 𝐴 = 𝐵) → ¬ 𝐴𝐵)
1110ex 413 . 2 (𝜑 → (¬ 𝐴 = 𝐵 → ¬ 𝐴𝐵))
121, 11mt4d 117 1 (𝜑𝐴 = 𝐵)
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wa 396   = wceq 1540  wcel 2105  wss 3897  wpss 3898   class class class wbr 5087  ωcom 7759  cen 8780
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1912  ax-6 1970  ax-7 2010  ax-8 2107  ax-9 2115  ax-10 2136  ax-11 2153  ax-12 2170  ax-ext 2708  ax-sep 5238  ax-nul 5245  ax-pr 5367  ax-un 7630
This theorem depends on definitions:  df-bi 206  df-an 397  df-or 845  df-3or 1087  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1781  df-nf 1785  df-sb 2067  df-mo 2539  df-eu 2568  df-clab 2715  df-cleq 2729  df-clel 2815  df-nfc 2887  df-ne 2942  df-ral 3063  df-rex 3072  df-reu 3351  df-rab 3405  df-v 3443  df-sbc 3727  df-csb 3843  df-dif 3900  df-un 3902  df-in 3904  df-ss 3914  df-pss 3916  df-nul 4268  df-if 4472  df-pw 4547  df-sn 4572  df-pr 4574  df-op 4578  df-uni 4851  df-br 5088  df-opab 5150  df-mpt 5171  df-tr 5205  df-id 5507  df-eprel 5513  df-po 5521  df-so 5522  df-fr 5563  df-we 5565  df-xp 5614  df-rel 5615  df-cnv 5616  df-co 5617  df-dm 5618  df-rn 5619  df-res 5620  df-ima 5621  df-ord 6292  df-on 6293  df-lim 6294  df-suc 6295  df-iota 6418  df-fun 6468  df-fn 6469  df-f 6470  df-f1 6471  df-fo 6472  df-f1o 6473  df-fv 6474  df-om 7760  df-1o 8346  df-en 8784  df-dom 8785  df-fin 8787
This theorem is referenced by: (None)
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