Theorem ltexpri 9865

Description: Proposition 9-3.5(iv) of [Gleason] p. 123. (Contributed by NM, 13-May-1996.) (Revised by Mario Carneiro, 14-Jun-2013.) (New usage is discouraged.)

Assertion

Ref	Expression
ltexpri	⊢ (𝐴<P 𝐵 → ∃𝑥 ∈ P (𝐴 +P 𝑥) = 𝐵)

Distinct variable groups:   𝑥,𝐴   𝑥,𝐵

Proof of Theorem ltexpri

Dummy variables 𝑦 𝑧 𝑤 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		ltrelpr 9820	. . 3 ⊢ <P ⊆ (P × P)
2	1	brel 5168	. 2 ⊢ (𝐴<P 𝐵 → (𝐴 ∈ P ∧ 𝐵 ∈ P))
3		ltprord 9852	. . 3 ⊢ ((𝐴 ∈ P ∧ 𝐵 ∈ P) → (𝐴<P 𝐵 ↔ 𝐴 ⊊ 𝐵))
4		oveq2 6658	. . . . . . . . . . 11 ⊢ (𝑦 = 𝑧 → (𝑤 +Q 𝑦) = (𝑤 +Q 𝑧))
5	4	eleq1d 2686	. . . . . . . . . 10 ⊢ (𝑦 = 𝑧 → ((𝑤 +Q 𝑦) ∈ 𝐵 ↔ (𝑤 +Q 𝑧) ∈ 𝐵))
6	5	anbi2d 740	. . . . . . . . 9 ⊢ (𝑦 = 𝑧 → ((¬ 𝑤 ∈ 𝐴 ∧ (𝑤 +Q 𝑦) ∈ 𝐵) ↔ (¬ 𝑤 ∈ 𝐴 ∧ (𝑤 +Q 𝑧) ∈ 𝐵)))
7	6	exbidv 1850	. . . . . . . 8 ⊢ (𝑦 = 𝑧 → (∃𝑤(¬ 𝑤 ∈ 𝐴 ∧ (𝑤 +Q 𝑦) ∈ 𝐵) ↔ ∃𝑤(¬ 𝑤 ∈ 𝐴 ∧ (𝑤 +Q 𝑧) ∈ 𝐵)))
8	7	cbvabv 2747	. . . . . . 7 ⊢ {𝑦 ∣ ∃𝑤(¬ 𝑤 ∈ 𝐴 ∧ (𝑤 +Q 𝑦) ∈ 𝐵)} = {𝑧 ∣ ∃𝑤(¬ 𝑤 ∈ 𝐴 ∧ (𝑤 +Q 𝑧) ∈ 𝐵)}
9	8	ltexprlem5 9862	. . . . . 6 ⊢ ((𝐵 ∈ P ∧ 𝐴 ⊊ 𝐵) → {𝑦 ∣ ∃𝑤(¬ 𝑤 ∈ 𝐴 ∧ (𝑤 +Q 𝑦) ∈ 𝐵)} ∈ P)
10	9	adantll 750	. . . . 5 ⊢ (((𝐴 ∈ P ∧ 𝐵 ∈ P) ∧ 𝐴 ⊊ 𝐵) → {𝑦 ∣ ∃𝑤(¬ 𝑤 ∈ 𝐴 ∧ (𝑤 +Q 𝑦) ∈ 𝐵)} ∈ P)
11	8	ltexprlem6 9863	. . . . . 6 ⊢ (((𝐴 ∈ P ∧ 𝐵 ∈ P) ∧ 𝐴 ⊊ 𝐵) → (𝐴 +P {𝑦 ∣ ∃𝑤(¬ 𝑤 ∈ 𝐴 ∧ (𝑤 +Q 𝑦) ∈ 𝐵)}) ⊆ 𝐵)
12	8	ltexprlem7 9864	. . . . . 6 ⊢ (((𝐴 ∈ P ∧ 𝐵 ∈ P) ∧ 𝐴 ⊊ 𝐵) → 𝐵 ⊆ (𝐴 +P {𝑦 ∣ ∃𝑤(¬ 𝑤 ∈ 𝐴 ∧ (𝑤 +Q 𝑦) ∈ 𝐵)}))
13	11, 12	eqssd 3620	. . . . 5 ⊢ (((𝐴 ∈ P ∧ 𝐵 ∈ P) ∧ 𝐴 ⊊ 𝐵) → (𝐴 +P {𝑦 ∣ ∃𝑤(¬ 𝑤 ∈ 𝐴 ∧ (𝑤 +Q 𝑦) ∈ 𝐵)}) = 𝐵)
14		oveq2 6658	. . . . . . 7 ⊢ (𝑥 = {𝑦 ∣ ∃𝑤(¬ 𝑤 ∈ 𝐴 ∧ (𝑤 +Q 𝑦) ∈ 𝐵)} → (𝐴 +P 𝑥) = (𝐴 +P {𝑦 ∣ ∃𝑤(¬ 𝑤 ∈ 𝐴 ∧ (𝑤 +Q 𝑦) ∈ 𝐵)}))
15	14	eqeq1d 2624	. . . . . 6 ⊢ (𝑥 = {𝑦 ∣ ∃𝑤(¬ 𝑤 ∈ 𝐴 ∧ (𝑤 +Q 𝑦) ∈ 𝐵)} → ((𝐴 +P 𝑥) = 𝐵 ↔ (𝐴 +P {𝑦 ∣ ∃𝑤(¬ 𝑤 ∈ 𝐴 ∧ (𝑤 +Q 𝑦) ∈ 𝐵)}) = 𝐵))
16	15	rspcev 3309	. . . . 5 ⊢ (({𝑦 ∣ ∃𝑤(¬ 𝑤 ∈ 𝐴 ∧ (𝑤 +Q 𝑦) ∈ 𝐵)} ∈ P ∧ (𝐴 +P {𝑦 ∣ ∃𝑤(¬ 𝑤 ∈ 𝐴 ∧ (𝑤 +Q 𝑦) ∈ 𝐵)}) = 𝐵) → ∃𝑥 ∈ P (𝐴 +P 𝑥) = 𝐵)
17	10, 13, 16	syl2anc 693	. . . 4 ⊢ (((𝐴 ∈ P ∧ 𝐵 ∈ P) ∧ 𝐴 ⊊ 𝐵) → ∃𝑥 ∈ P (𝐴 +P 𝑥) = 𝐵)
18	17	ex 450	. . 3 ⊢ ((𝐴 ∈ P ∧ 𝐵 ∈ P) → (𝐴 ⊊ 𝐵 → ∃𝑥 ∈ P (𝐴 +P 𝑥) = 𝐵))
19	3, 18	sylbid 230	. 2 ⊢ ((𝐴 ∈ P ∧ 𝐵 ∈ P) → (𝐴<P 𝐵 → ∃𝑥 ∈ P (𝐴 +P 𝑥) = 𝐵))
20	2, 19	mpcom 38	1 ⊢ (𝐴<P 𝐵 → ∃𝑥 ∈ P (𝐴 +P 𝑥) = 𝐵)

Syntax hints:  ¬ wn 3   → wi 4   ∧ wa 384   = wceq 1483  ∃wex 1704   ∈ wcel 1990  {cab 2608  ∃wrex 2913   ⊊ wpss 3575   class class class wbr 4653  (class class class)co 6650   +_Q cplq 9677  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:  ltaprlem  9866  recexsrlem  9924  mulgt0sr  9926  map2psrpr  9931