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	⊢ (𝐶 ∈ P → (𝐴<P 𝐵 → (𝐶 +P 𝐴)<P (𝐶 +P 𝐵)))

Proof of Theorem ltaprlem

Dummy variable 𝑥 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		ltrelpr 9765	. . . . . 6 ⊢ <P ⊆ (P × P)
2	1	brel 5133	. . . . 5 ⊢ (𝐴<P 𝐵 → (𝐴 ∈ P ∧ 𝐵 ∈ P))
3	2	simpld 475	. . . 4 ⊢ (𝐴<P 𝐵 → 𝐴 ∈ P)
4		ltexpri 9810	. . . . 5 ⊢ (𝐴<P 𝐵 → ∃𝑥 ∈ P (𝐴 +P 𝑥) = 𝐵)
5		addclpr 9785	. . . . . . . 8 ⊢ ((𝐶 ∈ P ∧ 𝐴 ∈ P) → (𝐶 +P 𝐴) ∈ P)
6		ltaddpr 9801	. . . . . . . . . 10 ⊢ (((𝐶 +P 𝐴) ∈ P ∧ 𝑥 ∈ P) → (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))
9	7, 8	syl5eq 2672	. . . . . . . . . . 11 ⊢ ((𝐴 +P 𝑥) = 𝐵 → ((𝐶 +P 𝐴) +P 𝑥) = (𝐶 +P 𝐵))
10	9	breq2d 4630	. . . . . . . . . 10 ⊢ ((𝐴 +P 𝑥) = 𝐵 → ((𝐶 +P 𝐴)<P ((𝐶 +P 𝐴) +P 𝑥) ↔ (𝐶 +P 𝐴)<P (𝐶 +P 𝐵)))
11	6, 10	syl5ib 234	. . . . . . . . 9 ⊢ ((𝐴 +P 𝑥) = 𝐵 → (((𝐶 +P 𝐴) ∈ P ∧ 𝑥 ∈ P) → (𝐶 +P 𝐴)<P (𝐶 +P 𝐵)))
12	11	expd 452	. . . . . . . 8 ⊢ ((𝐴 +P 𝑥) = 𝐵 → ((𝐶 +P 𝐴) ∈ P → (𝑥 ∈ P → (𝐶 +P 𝐴)<P (𝐶 +P 𝐵))))
13	5, 12	syl5 34	. . . . . . 7 ⊢ ((𝐴 +P 𝑥) = 𝐵 → ((𝐶 ∈ P ∧ 𝐴 ∈ P) → (𝑥 ∈ P → (𝐶 +P 𝐴)<P (𝐶 +P 𝐵))))
14	13	com3r 87	. . . . . 6 ⊢ (𝑥 ∈ P → ((𝐴 +P 𝑥) = 𝐵 → ((𝐶 ∈ P ∧ 𝐴 ∈ P) → (𝐶 +P 𝐴)<P (𝐶 +P 𝐵))))
15	14	rexlimiv 3025	. . . . 5 ⊢ (∃𝑥 ∈ P (𝐴 +P 𝑥) = 𝐵 → ((𝐶 ∈ P ∧ 𝐴 ∈ P) → (𝐶 +P 𝐴)<P (𝐶 +P 𝐵)))
16	4, 15	syl 17	. . . 4 ⊢ (𝐴<P 𝐵 → ((𝐶 ∈ P ∧ 𝐴 ∈ P) → (𝐶 +P 𝐴)<P (𝐶 +P 𝐵)))
17	3, 16	sylan2i 686	. . 3 ⊢ (𝐴<P 𝐵 → ((𝐶 ∈ P ∧ 𝐴<P 𝐵) → (𝐶 +P 𝐴)<P (𝐶 +P 𝐵)))
18	17	expd 452	. 2 ⊢ (𝐴<P 𝐵 → (𝐶 ∈ P → (𝐴<P 𝐵 → (𝐶 +P 𝐴)<P (𝐶 +P 𝐵))))
19	18	pm2.43b 55	1 ⊢ (𝐶 ∈ P → (𝐴<P 𝐵 → (𝐶 +P 𝐴)<P (𝐶 +P 𝐵)))

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