Theorem ltaprlem 9745

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 9699	. . . . . 6 ⊢ <P ⊆ (P × P)
2	1	brel 5090	. . . . 5 ⊢ (𝐴<P 𝐵 → (𝐴 ∈ P ∧ 𝐵 ∈ P))
3	2	simpld 474	. . . 4 ⊢ (𝐴<P 𝐵 → 𝐴 ∈ P)
4		ltexpri 9744	. . . . 5 ⊢ (𝐴<P 𝐵 → ∃𝑥 ∈ P (𝐴 +P 𝑥) = 𝐵)
5		addclpr 9719	. . . . . . . 8 ⊢ ((𝐶 ∈ P ∧ 𝐴 ∈ P) → (𝐶 +P 𝐴) ∈ P)
6		ltaddpr 9735	. . . . . . . . . 10 ⊢ (((𝐶 +P 𝐴) ∈ P ∧ 𝑥 ∈ P) → (𝐶 +P 𝐴)<P ((𝐶 +P 𝐴) +P 𝑥))
7		addasspr 9723	. . . . . . . . . . . 12 ⊢ ((𝐶 +P 𝐴) +P 𝑥) = (𝐶 +P (𝐴 +P 𝑥))
8		oveq2 6557	. . . . . . . . . . . 12 ⊢ ((𝐴 +P 𝑥) = 𝐵 → (𝐶 +P (𝐴 +P 𝑥)) = (𝐶 +P 𝐵))
9	7, 8	syl5eq 2656	. . . . . . . . . . 11 ⊢ ((𝐴 +P 𝑥) = 𝐵 → ((𝐶 +P 𝐴) +P 𝑥) = (𝐶 +P 𝐵))
10	9	breq2d 4595	. . . . . . . . . 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 233	. . . . . . . . 9 ⊢ ((𝐴 +P 𝑥) = 𝐵 → (((𝐶 +P 𝐴) ∈ P ∧ 𝑥 ∈ P) → (𝐶 +P 𝐴)<P (𝐶 +P 𝐵)))
12	11	expd 451	. . . . . . . 8 ⊢ ((𝐴 +P 𝑥) = 𝐵 → ((𝐶 +P 𝐴) ∈ P → (𝑥 ∈ P → (𝐶 +P 𝐴)<P (𝐶 +P 𝐵))))
13	5, 12	syl5 33	. . . . . . 7 ⊢ ((𝐴 +P 𝑥) = 𝐵 → ((𝐶 ∈ P ∧ 𝐴 ∈ P) → (𝑥 ∈ P → (𝐶 +P 𝐴)<P (𝐶 +P 𝐵))))
14	13	com3r 85	. . . . . 6 ⊢ (𝑥 ∈ P → ((𝐴 +P 𝑥) = 𝐵 → ((𝐶 ∈ P ∧ 𝐴 ∈ P) → (𝐶 +P 𝐴)<P (𝐶 +P 𝐵))))
15	14	rexlimiv 3009	. . . . 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 685	. . 3 ⊢ (𝐴<P 𝐵 → ((𝐶 ∈ P ∧ 𝐴<P 𝐵) → (𝐶 +P 𝐴)<P (𝐶 +P 𝐵)))
18	17	expd 451	. 2 ⊢ (𝐴<P 𝐵 → (𝐶 ∈ P → (𝐴<P 𝐵 → (𝐶 +P 𝐴)<P (𝐶 +P 𝐵))))
19	18	pm2.43b 53	1 ⊢ (𝐶 ∈ P → (𝐴<P 𝐵 → (𝐶 +P 𝐴)<P (𝐶 +P 𝐵)))

Syntax hints:   → wi 4   ∧ wa 383   = wceq 1475   ∈ wcel 1977  ∃wrex 2897   class class class wbr 4583  (class class class)co 6549  Pcnp 9560   +_P cpp 9562  <_P cltp 9564

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-8 1979  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-sep 4709  ax-nul 4717  ax-pow 4769  ax-pr 4833  ax-un 6847  ax-inf2 8421

This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3or 1032  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-ral 2901  df-rex 2902  df-reu 2903  df-rmo 2904  df-rab 2905  df-v 3175  df-sbc 3403  df-csb 3500  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-pss 3556  df-nul 3875  df-if 4037  df-pw 4110  df-sn 4126  df-pr 4128  df-tp 4130  df-op 4132  df-uni 4373  df-int 4411  df-iun 4457  df-br 4584  df-opab 4644  df-mpt 4645  df-tr 4681  df-eprel 4949  df-id 4953  df-po 4959  df-so 4960  df-fr 4997  df-we 4999  df-xp 5044  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-res 5050  df-ima 5051  df-pred 5597  df-ord 5643  df-on 5644  df-lim 5645  df-suc 5646  df-iota 5768  df-fun 5806  df-fn 5807  df-f 5808  df-f1 5809  df-fo 5810  df-f1o 5811  df-fv 5812  df-ov 6552  df-oprab 6553  df-mpt2 6554  df-om 6958  df-1st 7059  df-2nd 7060  df-wrecs 7294  df-recs 7355  df-rdg 7393  df-1o 7447  df-oadd 7451  df-omul 7452  df-er 7629  df-ni 9573  df-pli 9574  df-mi 9575  df-lti 9576  df-plpq 9609  df-mpq 9610  df-ltpq 9611  df-enq 9612  df-nq 9613  df-erq 9614  df-plq 9615  df-mq 9616  df-1nq 9617  df-rq 9618  df-ltnq 9619  df-np 9682  df-plp 9684  df-ltp 9686

This theorem is referenced by:  ltapr  9746