Theorem ltaprlem 9866

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 9820	. . . . . 6 ⊢ <P ⊆ (P × P)
2	1	brel 5168	. . . . 5 ⊢ (𝐴<P 𝐵 → (𝐴 ∈ P ∧ 𝐵 ∈ P))
3	2	simpld 475	. . . 4 ⊢ (𝐴<P 𝐵 → 𝐴 ∈ P)
4		ltexpri 9865	. . . . 5 ⊢ (𝐴<P 𝐵 → ∃𝑥 ∈ P (𝐴 +P 𝑥) = 𝐵)
5		addclpr 9840	. . . . . . . 8 ⊢ ((𝐶 ∈ P ∧ 𝐴 ∈ P) → (𝐶 +P 𝐴) ∈ P)
6		ltaddpr 9856	. . . . . . . . . 10 ⊢ (((𝐶 +P 𝐴) ∈ P ∧ 𝑥 ∈ P) → (𝐶 +P 𝐴)<P ((𝐶 +P 𝐴) +P 𝑥))
7		addasspr 9844	. . . . . . . . . . . 12 ⊢ ((𝐶 +P 𝐴) +P 𝑥) = (𝐶 +P (𝐴 +P 𝑥))
8		oveq2 6658	. . . . . . . . . . . 12 ⊢ ((𝐴 +P 𝑥) = 𝐵 → (𝐶 +P (𝐴 +P 𝑥)) = (𝐶 +P 𝐵))
9	7, 8	syl5eq 2668	. . . . . . . . . . 11 ⊢ ((𝐴 +P 𝑥) = 𝐵 → ((𝐶 +P 𝐴) +P 𝑥) = (𝐶 +P 𝐵))
10	9	breq2d 4665	. . . . . . . . . 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 3027	. . . . 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 687	. . 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 1483   ∈ wcel 1990  ∃wrex 2913   class class class wbr 4653  (class class class)co 6650  Pcnp 9681   +_P cpp 9683  <_P cltp 9685

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-8 1992  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-sep 4781  ax-nul 4789  ax-pow 4843  ax-pr 4906  ax-un 6949  ax-inf2 8538

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1038  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ne 2795  df-ral 2917  df-rex 2918  df-reu 2919  df-rmo 2920  df-rab 2921  df-v 3202  df-sbc 3436  df-csb 3534  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-pss 3590  df-nul 3916  df-if 4087  df-pw 4160  df-sn 4178  df-pr 4180  df-tp 4182  df-op 4184  df-uni 4437  df-int 4476  df-iun 4522  df-br 4654  df-opab 4713  df-mpt 4730  df-tr 4753  df-id 5024  df-eprel 5029  df-po 5035  df-so 5036  df-fr 5073  df-we 5075  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-rn 5125  df-res 5126  df-ima 5127  df-pred 5680  df-ord 5726  df-on 5727  df-lim 5728  df-suc 5729  df-iota 5851  df-fun 5890  df-fn 5891  df-f 5892  df-f1 5893  df-fo 5894  df-f1o 5895  df-fv 5896  df-ov 6653  df-oprab 6654  df-mpt2 6655  df-om 7066  df-1st 7168  df-2nd 7169  df-wrecs 7407  df-recs 7468  df-rdg 7506  df-1o 7560  df-oadd 7564  df-omul 7565  df-er 7742  df-ni 9694  df-pli 9695  df-mi 9696  df-lti 9697  df-plpq 9730  df-mpq 9731  df-ltpq 9732  df-enq 9733  df-nq 9734  df-erq 9735  df-plq 9736  df-mq 9737  df-1nq 9738  df-rq 9739  df-ltnq 9740  df-np 9803  df-plp 9805  df-ltp 9807

This theorem is referenced by:  ltapr  9867