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Theorem ltaprlem 9811
Description: Lemma for Proposition 9-3.5(v) of [Gleason] p. 123. (Contributed by NM, 8-Apr-1996.) (New usage is discouraged.)
Assertion
Ref Expression
ltaprlem (𝐶P → (𝐴<P 𝐵 → (𝐶 +P 𝐴)<P (𝐶 +P 𝐵)))

Proof of Theorem ltaprlem
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 ltrelpr 9765 . . . . . 6 <P ⊆ (P × P)
21brel 5133 . . . . 5 (𝐴<P 𝐵 → (𝐴P𝐵P))
32simpld 475 . . . 4 (𝐴<P 𝐵𝐴P)
4 ltexpri 9810 . . . . 5 (𝐴<P 𝐵 → ∃𝑥P (𝐴 +P 𝑥) = 𝐵)
5 addclpr 9785 . . . . . . . 8 ((𝐶P𝐴P) → (𝐶 +P 𝐴) ∈ P)
6 ltaddpr 9801 . . . . . . . . . 10 (((𝐶 +P 𝐴) ∈ P𝑥P) → (𝐶 +P 𝐴)<P ((𝐶 +P 𝐴) +P 𝑥))
7 addasspr 9789 . . . . . . . . . . . 12 ((𝐶 +P 𝐴) +P 𝑥) = (𝐶 +P (𝐴 +P 𝑥))
8 oveq2 6613 . . . . . . . . . . . 12 ((𝐴 +P 𝑥) = 𝐵 → (𝐶 +P (𝐴 +P 𝑥)) = (𝐶 +P 𝐵))
97, 8syl5eq 2672 . . . . . . . . . . 11 ((𝐴 +P 𝑥) = 𝐵 → ((𝐶 +P 𝐴) +P 𝑥) = (𝐶 +P 𝐵))
109breq2d 4630 . . . . . . . . . 10 ((𝐴 +P 𝑥) = 𝐵 → ((𝐶 +P 𝐴)<P ((𝐶 +P 𝐴) +P 𝑥) ↔ (𝐶 +P 𝐴)<P (𝐶 +P 𝐵)))
116, 10syl5ib 234 . . . . . . . . 9 ((𝐴 +P 𝑥) = 𝐵 → (((𝐶 +P 𝐴) ∈ P𝑥P) → (𝐶 +P 𝐴)<P (𝐶 +P 𝐵)))
1211expd 452 . . . . . . . 8 ((𝐴 +P 𝑥) = 𝐵 → ((𝐶 +P 𝐴) ∈ P → (𝑥P → (𝐶 +P 𝐴)<P (𝐶 +P 𝐵))))
135, 12syl5 34 . . . . . . 7 ((𝐴 +P 𝑥) = 𝐵 → ((𝐶P𝐴P) → (𝑥P → (𝐶 +P 𝐴)<P (𝐶 +P 𝐵))))
1413com3r 87 . . . . . 6 (𝑥P → ((𝐴 +P 𝑥) = 𝐵 → ((𝐶P𝐴P) → (𝐶 +P 𝐴)<P (𝐶 +P 𝐵))))
1514rexlimiv 3025 . . . . 5 (∃𝑥P (𝐴 +P 𝑥) = 𝐵 → ((𝐶P𝐴P) → (𝐶 +P 𝐴)<P (𝐶 +P 𝐵)))
164, 15syl 17 . . . 4 (𝐴<P 𝐵 → ((𝐶P𝐴P) → (𝐶 +P 𝐴)<P (𝐶 +P 𝐵)))
173, 16sylan2i 686 . . 3 (𝐴<P 𝐵 → ((𝐶P𝐴<P 𝐵) → (𝐶 +P 𝐴)<P (𝐶 +P 𝐵)))
1817expd 452 . 2 (𝐴<P 𝐵 → (𝐶P → (𝐴<P 𝐵 → (𝐶 +P 𝐴)<P (𝐶 +P 𝐵))))
1918pm2.43b 55 1 (𝐶P → (𝐴<P 𝐵 → (𝐶 +P 𝐴)<P (𝐶 +P 𝐵)))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 384   = wceq 1480  wcel 1992  wrex 2913   class class class wbr 4618  (class class class)co 6605  Pcnp 9626   +P cpp 9628  <P cltp 9630
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1719  ax-4 1734  ax-5 1841  ax-6 1890  ax-7 1937  ax-8 1994  ax-9 2001  ax-10 2021  ax-11 2036  ax-12 2049  ax-13 2250  ax-ext 2606  ax-sep 4746  ax-nul 4754  ax-pow 4808  ax-pr 4872  ax-un 6903  ax-inf2 8483
This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1037  df-3an 1038  df-tru 1483  df-ex 1702  df-nf 1707  df-sb 1883  df-eu 2478  df-mo 2479  df-clab 2613  df-cleq 2619  df-clel 2622  df-nfc 2756  df-ne 2797  df-ral 2917  df-rex 2918  df-reu 2919  df-rmo 2920  df-rab 2921  df-v 3193  df-sbc 3423  df-csb 3520  df-dif 3563  df-un 3565  df-in 3567  df-ss 3574  df-pss 3576  df-nul 3897  df-if 4064  df-pw 4137  df-sn 4154  df-pr 4156  df-tp 4158  df-op 4160  df-uni 4408  df-int 4446  df-iun 4492  df-br 4619  df-opab 4679  df-mpt 4680  df-tr 4718  df-eprel 4990  df-id 4994  df-po 5000  df-so 5001  df-fr 5038  df-we 5040  df-xp 5085  df-rel 5086  df-cnv 5087  df-co 5088  df-dm 5089  df-rn 5090  df-res 5091  df-ima 5092  df-pred 5642  df-ord 5688  df-on 5689  df-lim 5690  df-suc 5691  df-iota 5813  df-fun 5852  df-fn 5853  df-f 5854  df-f1 5855  df-fo 5856  df-f1o 5857  df-fv 5858  df-ov 6608  df-oprab 6609  df-mpt2 6610  df-om 7014  df-1st 7116  df-2nd 7117  df-wrecs 7353  df-recs 7414  df-rdg 7452  df-1o 7506  df-oadd 7510  df-omul 7511  df-er 7688  df-ni 9639  df-pli 9640  df-mi 9641  df-lti 9642  df-plpq 9675  df-mpq 9676  df-ltpq 9677  df-enq 9678  df-nq 9679  df-erq 9680  df-plq 9681  df-mq 9682  df-1nq 9683  df-rq 9684  df-ltnq 9685  df-np 9748  df-plp 9750  df-ltp 9752
This theorem is referenced by:  ltapr  9812
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