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Theorem cdleme31se2 40365
Description: Part of proof of Lemma D in [Crawley] p. 113. (Contributed by NM, 3-Apr-2013.)
Hypotheses
Ref Expression
cdleme31se2.e 𝐸 = ((𝑃 𝑄) (𝐷 ((𝑅 𝑡) 𝑊)))
cdleme31se2.y 𝑌 = ((𝑃 𝑄) (𝑆 / 𝑡𝐷 ((𝑅 𝑆) 𝑊)))
Assertion
Ref Expression
cdleme31se2 (𝑆𝐴𝑆 / 𝑡𝐸 = 𝑌)
Distinct variable groups:   𝑡,𝐴   𝑡,   𝑡,   𝑡,𝑃   𝑡,𝑄   𝑡,𝑅   𝑡,𝑆   𝑡,𝑊
Allowed substitution hints:   𝐷(𝑡)   𝐸(𝑡)   𝑌(𝑡)

Proof of Theorem cdleme31se2
StepHypRef Expression
1 nfcv 2902 . . . . 5 𝑡(𝑃 𝑄)
2 nfcv 2902 . . . . 5 𝑡
3 nfcsb1v 3932 . . . . . 6 𝑡𝑆 / 𝑡𝐷
4 nfcv 2902 . . . . . 6 𝑡
5 nfcv 2902 . . . . . 6 𝑡((𝑅 𝑆) 𝑊)
63, 4, 5nfov 7460 . . . . 5 𝑡(𝑆 / 𝑡𝐷 ((𝑅 𝑆) 𝑊))
71, 2, 6nfov 7460 . . . 4 𝑡((𝑃 𝑄) (𝑆 / 𝑡𝐷 ((𝑅 𝑆) 𝑊)))
87a1i 11 . . 3 (𝑆𝐴𝑡((𝑃 𝑄) (𝑆 / 𝑡𝐷 ((𝑅 𝑆) 𝑊))))
9 csbeq1a 3921 . . . . 5 (𝑡 = 𝑆𝐷 = 𝑆 / 𝑡𝐷)
10 oveq2 7438 . . . . . 6 (𝑡 = 𝑆 → (𝑅 𝑡) = (𝑅 𝑆))
1110oveq1d 7445 . . . . 5 (𝑡 = 𝑆 → ((𝑅 𝑡) 𝑊) = ((𝑅 𝑆) 𝑊))
129, 11oveq12d 7448 . . . 4 (𝑡 = 𝑆 → (𝐷 ((𝑅 𝑡) 𝑊)) = (𝑆 / 𝑡𝐷 ((𝑅 𝑆) 𝑊)))
1312oveq2d 7446 . . 3 (𝑡 = 𝑆 → ((𝑃 𝑄) (𝐷 ((𝑅 𝑡) 𝑊))) = ((𝑃 𝑄) (𝑆 / 𝑡𝐷 ((𝑅 𝑆) 𝑊))))
148, 13csbiegf 3941 . 2 (𝑆𝐴𝑆 / 𝑡((𝑃 𝑄) (𝐷 ((𝑅 𝑡) 𝑊))) = ((𝑃 𝑄) (𝑆 / 𝑡𝐷 ((𝑅 𝑆) 𝑊))))
15 cdleme31se2.e . . 3 𝐸 = ((𝑃 𝑄) (𝐷 ((𝑅 𝑡) 𝑊)))
1615csbeq2i 3915 . 2 𝑆 / 𝑡𝐸 = 𝑆 / 𝑡((𝑃 𝑄) (𝐷 ((𝑅 𝑡) 𝑊)))
17 cdleme31se2.y . 2 𝑌 = ((𝑃 𝑄) (𝑆 / 𝑡𝐷 ((𝑅 𝑆) 𝑊)))
1814, 16, 173eqtr4g 2799 1 (𝑆𝐴𝑆 / 𝑡𝐸 = 𝑌)
Colors of variables: wff setvar class
Syntax hints:  wi 4   = wceq 1536  wcel 2105  wnfc 2887  csb 3907  (class class class)co 7430
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1791  ax-4 1805  ax-5 1907  ax-6 1964  ax-7 2004  ax-8 2107  ax-9 2115  ax-10 2138  ax-11 2154  ax-12 2174  ax-ext 2705
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1539  df-fal 1549  df-ex 1776  df-nf 1780  df-sb 2062  df-clab 2712  df-cleq 2726  df-clel 2813  df-nfc 2889  df-ral 3059  df-rex 3068  df-rab 3433  df-v 3479  df-sbc 3791  df-csb 3908  df-dif 3965  df-un 3967  df-ss 3979  df-nul 4339  df-if 4531  df-sn 4631  df-pr 4633  df-op 4637  df-uni 4912  df-br 5148  df-iota 6515  df-fv 6570  df-ov 7433
This theorem is referenced by:  cdlemeg47rv2  40492
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