Theorem addclprlem1 10931

Description: Lemma to prove downward closure in positive real addition. Part of proof of Proposition 9-3.5 of [Gleason] p. 123. (Contributed by NM, 13-Mar-1996.) (New usage is discouraged.)

Assertion

Ref	Expression
addclprlem1	⊢ (((𝐴 ∈ P ∧ 𝑔 ∈ 𝐴) ∧ 𝑥 ∈ Q) → (𝑥 <Q (𝑔 +Q ℎ) → ((𝑥 ·Q (*Q‘(𝑔 +Q ℎ))) ·Q 𝑔) ∈ 𝐴))

Proof of Theorem addclprlem1

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

Step	Hyp	Ref	Expression
1		elprnq 10906	. . 3 ⊢ ((𝐴 ∈ P ∧ 𝑔 ∈ 𝐴) → 𝑔 ∈ Q)
2		ltrnq 10894	. . . . 5 ⊢ (𝑥 <Q (𝑔 +Q ℎ) ↔ (*Q‘(𝑔 +Q ℎ)) <Q (*Q‘𝑥))
3		ltmnq 10887	. . . . . 6 ⊢ (𝑥 ∈ Q → ((*Q‘(𝑔 +Q ℎ)) <Q (*Q‘𝑥) ↔ (𝑥 ·Q (*Q‘(𝑔 +Q ℎ))) <Q (𝑥 ·Q (*Q‘𝑥))))
4		ovex 7393	. . . . . . 7 ⊢ (𝑥 ·Q (*Q‘(𝑔 +Q ℎ))) ∈ V
5		ovex 7393	. . . . . . 7 ⊢ (𝑥 ·Q (*Q‘𝑥)) ∈ V
6		ltmnq 10887	. . . . . . 7 ⊢ (𝑤 ∈ Q → (𝑦 <Q 𝑧 ↔ (𝑤 ·Q 𝑦) <Q (𝑤 ·Q 𝑧)))
7		vex 3445	. . . . . . 7 ⊢ 𝑔 ∈ V
8		mulcomnq 10868	. . . . . . 7 ⊢ (𝑦 ·Q 𝑧) = (𝑧 ·Q 𝑦)
9	4, 5, 6, 7, 8	caovord2 7572	. . . . . 6 ⊢ (𝑔 ∈ Q → ((𝑥 ·Q (*Q‘(𝑔 +Q ℎ))) <Q (𝑥 ·Q (*Q‘𝑥)) ↔ ((𝑥 ·Q (*Q‘(𝑔 +Q ℎ))) ·Q 𝑔) <Q ((𝑥 ·Q (*Q‘𝑥)) ·Q 𝑔)))
10	3, 9	sylan9bbr 510	. . . . 5 ⊢ ((𝑔 ∈ Q ∧ 𝑥 ∈ Q) → ((*Q‘(𝑔 +Q ℎ)) <Q (*Q‘𝑥) ↔ ((𝑥 ·Q (*Q‘(𝑔 +Q ℎ))) ·Q 𝑔) <Q ((𝑥 ·Q (*Q‘𝑥)) ·Q 𝑔)))
11	2, 10	bitrid 283	. . . 4 ⊢ ((𝑔 ∈ Q ∧ 𝑥 ∈ Q) → (𝑥 <Q (𝑔 +Q ℎ) ↔ ((𝑥 ·Q (*Q‘(𝑔 +Q ℎ))) ·Q 𝑔) <Q ((𝑥 ·Q (*Q‘𝑥)) ·Q 𝑔)))
12		recidnq 10880	. . . . . . 7 ⊢ (𝑥 ∈ Q → (𝑥 ·Q (*Q‘𝑥)) = 1Q)
13	12	oveq1d 7375	. . . . . 6 ⊢ (𝑥 ∈ Q → ((𝑥 ·Q (*Q‘𝑥)) ·Q 𝑔) = (1Q ·Q 𝑔))
14		mulcomnq 10868	. . . . . . 7 ⊢ (1Q ·Q 𝑔) = (𝑔 ·Q 1Q)
15		mulidnq 10878	. . . . . . 7 ⊢ (𝑔 ∈ Q → (𝑔 ·Q 1Q) = 𝑔)
16	14, 15	eqtrid 2784	. . . . . 6 ⊢ (𝑔 ∈ Q → (1Q ·Q 𝑔) = 𝑔)
17	13, 16	sylan9eqr 2794	. . . . 5 ⊢ ((𝑔 ∈ Q ∧ 𝑥 ∈ Q) → ((𝑥 ·Q (*Q‘𝑥)) ·Q 𝑔) = 𝑔)
18	17	breq2d 5111	. . . 4 ⊢ ((𝑔 ∈ Q ∧ 𝑥 ∈ Q) → (((𝑥 ·Q (*Q‘(𝑔 +Q ℎ))) ·Q 𝑔) <Q ((𝑥 ·Q (*Q‘𝑥)) ·Q 𝑔) ↔ ((𝑥 ·Q (*Q‘(𝑔 +Q ℎ))) ·Q 𝑔) <Q 𝑔))
19	11, 18	bitrd 279	. . 3 ⊢ ((𝑔 ∈ Q ∧ 𝑥 ∈ Q) → (𝑥 <Q (𝑔 +Q ℎ) ↔ ((𝑥 ·Q (*Q‘(𝑔 +Q ℎ))) ·Q 𝑔) <Q 𝑔))
20	1, 19	sylan 581	. 2 ⊢ (((𝐴 ∈ P ∧ 𝑔 ∈ 𝐴) ∧ 𝑥 ∈ Q) → (𝑥 <Q (𝑔 +Q ℎ) ↔ ((𝑥 ·Q (*Q‘(𝑔 +Q ℎ))) ·Q 𝑔) <Q 𝑔))
21		prcdnq 10908	. . 3 ⊢ ((𝐴 ∈ P ∧ 𝑔 ∈ 𝐴) → (((𝑥 ·Q (*Q‘(𝑔 +Q ℎ))) ·Q 𝑔) <Q 𝑔 → ((𝑥 ·Q (*Q‘(𝑔 +Q ℎ))) ·Q 𝑔) ∈ 𝐴))
22	21	adantr 480	. 2 ⊢ (((𝐴 ∈ P ∧ 𝑔 ∈ 𝐴) ∧ 𝑥 ∈ Q) → (((𝑥 ·Q (*Q‘(𝑔 +Q ℎ))) ·Q 𝑔) <Q 𝑔 → ((𝑥 ·Q (*Q‘(𝑔 +Q ℎ))) ·Q 𝑔) ∈ 𝐴))
23	20, 22	sylbid 240	1 ⊢ (((𝐴 ∈ P ∧ 𝑔 ∈ 𝐴) ∧ 𝑥 ∈ Q) → (𝑥 <Q (𝑔 +Q ℎ) → ((𝑥 ·Q (*Q‘(𝑔 +Q ℎ))) ·Q 𝑔) ∈ 𝐴))

Syntax hints:   → wi 4   ↔ wb 206   ∧ wa 395   ∈ wcel 2114   class class class wbr 5099  ‘cfv 6493  (class class class)co 7360  Qcnq 10767  1_Qc1q 10768   +_Q cplq 10770   ·_Q cmq 10771  *_Qcrq 10772   <_Q cltq 10773  Pcnp 10774

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-10 2147  ax-11 2163  ax-12 2185  ax-ext 2709  ax-sep 5242  ax-nul 5252  ax-pr 5378  ax-un 7682

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3or 1088  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-nf 1786  df-sb 2069  df-mo 2540  df-eu 2570  df-clab 2716  df-cleq 2729  df-clel 2812  df-nfc 2886  df-ne 2934  df-ral 3053  df-rex 3062  df-rmo 3351  df-reu 3352  df-rab 3401  df-v 3443  df-sbc 3742  df-csb 3851  df-dif 3905  df-un 3907  df-in 3909  df-ss 3919  df-pss 3922  df-nul 4287  df-if 4481  df-pw 4557  df-sn 4582  df-pr 4584  df-op 4588  df-uni 4865  df-iun 4949  df-br 5100  df-opab 5162  df-mpt 5181  df-tr 5207  df-id 5520  df-eprel 5525  df-po 5533  df-so 5534  df-fr 5578  df-we 5580  df-xp 5631  df-rel 5632  df-cnv 5633  df-co 5634  df-dm 5635  df-rn 5636  df-res 5637  df-ima 5638  df-pred 6260  df-ord 6321  df-on 6322  df-lim 6323  df-suc 6324  df-iota 6449  df-fun 6495  df-fn 6496  df-f 6497  df-f1 6498  df-fo 6499  df-f1o 6500  df-fv 6501  df-ov 7363  df-oprab 7364  df-mpo 7365  df-om 7811  df-1st 7935  df-2nd 7936  df-frecs 8225  df-wrecs 8256  df-recs 8305  df-rdg 8343  df-1o 8399  df-oadd 8403  df-omul 8404  df-er 8637  df-ni 10787  df-mi 10789  df-lti 10790  df-mpq 10824  df-ltpq 10825  df-enq 10826  df-nq 10827  df-erq 10828  df-mq 10830  df-1nq 10831  df-rq 10832  df-ltnq 10833  df-np 10896

This theorem is referenced by:  addclprlem2  10932