Theorem mulasssr 11050

Description: Multiplication of signed reals is associative. (Contributed by NM, 2-Sep-1995.) (Revised by Mario Carneiro, 28-Apr-2015.) (New usage is discouraged.)

Assertion

Ref	Expression
mulasssr	⊢ ((𝐴 ·R 𝐵) ·R 𝐶) = (𝐴 ·R (𝐵 ·R 𝐶))

Proof of Theorem mulasssr

Dummy variables 𝑓 𝑔 ℎ 𝑢 𝑣 𝑤 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		df-nr 11016	. . 3 ⊢ R = ((P × P) / ~R )
2		mulsrpr 11036	. . 3 ⊢ (((𝑥 ∈ P ∧ 𝑦 ∈ P) ∧ (𝑧 ∈ P ∧ 𝑤 ∈ P)) → ([⟨𝑥, 𝑦⟩] ~R ·R [⟨𝑧, 𝑤⟩] ~R ) = [⟨((𝑥 ·P 𝑧) +P (𝑦 ·P 𝑤)), ((𝑥 ·P 𝑤) +P (𝑦 ·P 𝑧))⟩] ~R )
3		mulsrpr 11036	. . 3 ⊢ (((𝑧 ∈ P ∧ 𝑤 ∈ P) ∧ (𝑣 ∈ P ∧ 𝑢 ∈ P)) → ([⟨𝑧, 𝑤⟩] ~R ·R [⟨𝑣, 𝑢⟩] ~R ) = [⟨((𝑧 ·P 𝑣) +P (𝑤 ·P 𝑢)), ((𝑧 ·P 𝑢) +P (𝑤 ·P 𝑣))⟩] ~R )
4		mulsrpr 11036	. . 3 ⊢ (((((𝑥 ·P 𝑧) +P (𝑦 ·P 𝑤)) ∈ P ∧ ((𝑥 ·P 𝑤) +P (𝑦 ·P 𝑧)) ∈ P) ∧ (𝑣 ∈ P ∧ 𝑢 ∈ P)) → ([⟨((𝑥 ·P 𝑧) +P (𝑦 ·P 𝑤)), ((𝑥 ·P 𝑤) +P (𝑦 ·P 𝑧))⟩] ~R ·R [⟨𝑣, 𝑢⟩] ~R ) = [⟨((((𝑥 ·P 𝑧) +P (𝑦 ·P 𝑤)) ·P 𝑣) +P (((𝑥 ·P 𝑤) +P (𝑦 ·P 𝑧)) ·P 𝑢)), ((((𝑥 ·P 𝑧) +P (𝑦 ·P 𝑤)) ·P 𝑢) +P (((𝑥 ·P 𝑤) +P (𝑦 ·P 𝑧)) ·P 𝑣))⟩] ~R )
5		mulsrpr 11036	. . 3 ⊢ (((𝑥 ∈ P ∧ 𝑦 ∈ P) ∧ (((𝑧 ·P 𝑣) +P (𝑤 ·P 𝑢)) ∈ P ∧ ((𝑧 ·P 𝑢) +P (𝑤 ·P 𝑣)) ∈ P)) → ([⟨𝑥, 𝑦⟩] ~R ·R [⟨((𝑧 ·P 𝑣) +P (𝑤 ·P 𝑢)), ((𝑧 ·P 𝑢) +P (𝑤 ·P 𝑣))⟩] ~R ) = [⟨((𝑥 ·P ((𝑧 ·P 𝑣) +P (𝑤 ·P 𝑢))) +P (𝑦 ·P ((𝑧 ·P 𝑢) +P (𝑤 ·P 𝑣)))), ((𝑥 ·P ((𝑧 ·P 𝑢) +P (𝑤 ·P 𝑣))) +P (𝑦 ·P ((𝑧 ·P 𝑣) +P (𝑤 ·P 𝑢))))⟩] ~R )
6		mulclpr 10980	. . . . . 6 ⊢ ((𝑥 ∈ P ∧ 𝑧 ∈ P) → (𝑥 ·P 𝑧) ∈ P)
7		mulclpr 10980	. . . . . 6 ⊢ ((𝑦 ∈ P ∧ 𝑤 ∈ P) → (𝑦 ·P 𝑤) ∈ P)
8		addclpr 10978	. . . . . 6 ⊢ (((𝑥 ·P 𝑧) ∈ P ∧ (𝑦 ·P 𝑤) ∈ P) → ((𝑥 ·P 𝑧) +P (𝑦 ·P 𝑤)) ∈ P)
9	6, 7, 8	syl2an 596	. . . . 5 ⊢ (((𝑥 ∈ P ∧ 𝑧 ∈ P) ∧ (𝑦 ∈ P ∧ 𝑤 ∈ P)) → ((𝑥 ·P 𝑧) +P (𝑦 ·P 𝑤)) ∈ P)
10	9	an4s 660	. . . 4 ⊢ (((𝑥 ∈ P ∧ 𝑦 ∈ P) ∧ (𝑧 ∈ P ∧ 𝑤 ∈ P)) → ((𝑥 ·P 𝑧) +P (𝑦 ·P 𝑤)) ∈ P)
11		mulclpr 10980	. . . . . 6 ⊢ ((𝑥 ∈ P ∧ 𝑤 ∈ P) → (𝑥 ·P 𝑤) ∈ P)
12		mulclpr 10980	. . . . . 6 ⊢ ((𝑦 ∈ P ∧ 𝑧 ∈ P) → (𝑦 ·P 𝑧) ∈ P)
13		addclpr 10978	. . . . . 6 ⊢ (((𝑥 ·P 𝑤) ∈ P ∧ (𝑦 ·P 𝑧) ∈ P) → ((𝑥 ·P 𝑤) +P (𝑦 ·P 𝑧)) ∈ P)
14	11, 12, 13	syl2an 596	. . . . 5 ⊢ (((𝑥 ∈ P ∧ 𝑤 ∈ P) ∧ (𝑦 ∈ P ∧ 𝑧 ∈ P)) → ((𝑥 ·P 𝑤) +P (𝑦 ·P 𝑧)) ∈ P)
15	14	an42s 661	. . . 4 ⊢ (((𝑥 ∈ P ∧ 𝑦 ∈ P) ∧ (𝑧 ∈ P ∧ 𝑤 ∈ P)) → ((𝑥 ·P 𝑤) +P (𝑦 ·P 𝑧)) ∈ P)
16	10, 15	jca 511	. . 3 ⊢ (((𝑥 ∈ P ∧ 𝑦 ∈ P) ∧ (𝑧 ∈ P ∧ 𝑤 ∈ P)) → (((𝑥 ·P 𝑧) +P (𝑦 ·P 𝑤)) ∈ P ∧ ((𝑥 ·P 𝑤) +P (𝑦 ·P 𝑧)) ∈ P))
17		mulclpr 10980	. . . . . 6 ⊢ ((𝑧 ∈ P ∧ 𝑣 ∈ P) → (𝑧 ·P 𝑣) ∈ P)
18		mulclpr 10980	. . . . . 6 ⊢ ((𝑤 ∈ P ∧ 𝑢 ∈ P) → (𝑤 ·P 𝑢) ∈ P)
19		addclpr 10978	. . . . . 6 ⊢ (((𝑧 ·P 𝑣) ∈ P ∧ (𝑤 ·P 𝑢) ∈ P) → ((𝑧 ·P 𝑣) +P (𝑤 ·P 𝑢)) ∈ P)
20	17, 18, 19	syl2an 596	. . . . 5 ⊢ (((𝑧 ∈ P ∧ 𝑣 ∈ P) ∧ (𝑤 ∈ P ∧ 𝑢 ∈ P)) → ((𝑧 ·P 𝑣) +P (𝑤 ·P 𝑢)) ∈ P)
21	20	an4s 660	. . . 4 ⊢ (((𝑧 ∈ P ∧ 𝑤 ∈ P) ∧ (𝑣 ∈ P ∧ 𝑢 ∈ P)) → ((𝑧 ·P 𝑣) +P (𝑤 ·P 𝑢)) ∈ P)
22		mulclpr 10980	. . . . . 6 ⊢ ((𝑧 ∈ P ∧ 𝑢 ∈ P) → (𝑧 ·P 𝑢) ∈ P)
23		mulclpr 10980	. . . . . 6 ⊢ ((𝑤 ∈ P ∧ 𝑣 ∈ P) → (𝑤 ·P 𝑣) ∈ P)
24		addclpr 10978	. . . . . 6 ⊢ (((𝑧 ·P 𝑢) ∈ P ∧ (𝑤 ·P 𝑣) ∈ P) → ((𝑧 ·P 𝑢) +P (𝑤 ·P 𝑣)) ∈ P)
25	22, 23, 24	syl2an 596	. . . . 5 ⊢ (((𝑧 ∈ P ∧ 𝑢 ∈ P) ∧ (𝑤 ∈ P ∧ 𝑣 ∈ P)) → ((𝑧 ·P 𝑢) +P (𝑤 ·P 𝑣)) ∈ P)
26	25	an42s 661	. . . 4 ⊢ (((𝑧 ∈ P ∧ 𝑤 ∈ P) ∧ (𝑣 ∈ P ∧ 𝑢 ∈ P)) → ((𝑧 ·P 𝑢) +P (𝑤 ·P 𝑣)) ∈ P)
27	21, 26	jca 511	. . 3 ⊢ (((𝑧 ∈ P ∧ 𝑤 ∈ P) ∧ (𝑣 ∈ P ∧ 𝑢 ∈ P)) → (((𝑧 ·P 𝑣) +P (𝑤 ·P 𝑢)) ∈ P ∧ ((𝑧 ·P 𝑢) +P (𝑤 ·P 𝑣)) ∈ P))
28		vex 3454	. . . 4 ⊢ 𝑥 ∈ V
29		vex 3454	. . . 4 ⊢ 𝑦 ∈ V
30		vex 3454	. . . 4 ⊢ 𝑧 ∈ V
31		mulcompr 10983	. . . 4 ⊢ (𝑓 ·P 𝑔) = (𝑔 ·P 𝑓)
32		distrpr 10988	. . . 4 ⊢ (𝑓 ·P (𝑔 +P ℎ)) = ((𝑓 ·P 𝑔) +P (𝑓 ·P ℎ))
33		vex 3454	. . . 4 ⊢ 𝑤 ∈ V
34		vex 3454	. . . 4 ⊢ 𝑣 ∈ V
35		mulasspr 10984	. . . 4 ⊢ ((𝑓 ·P 𝑔) ·P ℎ) = (𝑓 ·P (𝑔 ·P ℎ))
36		vex 3454	. . . 4 ⊢ 𝑢 ∈ V
37		addcompr 10981	. . . 4 ⊢ (𝑓 +P 𝑔) = (𝑔 +P 𝑓)
38		addasspr 10982	. . . 4 ⊢ ((𝑓 +P 𝑔) +P ℎ) = (𝑓 +P (𝑔 +P ℎ))
39	28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38	caovlem2 7628	. . 3 ⊢ ((((𝑥 ·P 𝑧) +P (𝑦 ·P 𝑤)) ·P 𝑣) +P (((𝑥 ·P 𝑤) +P (𝑦 ·P 𝑧)) ·P 𝑢)) = ((𝑥 ·P ((𝑧 ·P 𝑣) +P (𝑤 ·P 𝑢))) +P (𝑦 ·P ((𝑧 ·P 𝑢) +P (𝑤 ·P 𝑣))))
40	28, 29, 30, 31, 32, 33, 36, 35, 34, 37, 38	caovlem2 7628	. . 3 ⊢ ((((𝑥 ·P 𝑧) +P (𝑦 ·P 𝑤)) ·P 𝑢) +P (((𝑥 ·P 𝑤) +P (𝑦 ·P 𝑧)) ·P 𝑣)) = ((𝑥 ·P ((𝑧 ·P 𝑢) +P (𝑤 ·P 𝑣))) +P (𝑦 ·P ((𝑧 ·P 𝑣) +P (𝑤 ·P 𝑢))))
41	1, 2, 3, 4, 5, 16, 27, 39, 40	ecovass 8800	. 2 ⊢ ((𝐴 ∈ R ∧ 𝐵 ∈ R ∧ 𝐶 ∈ R) → ((𝐴 ·R 𝐵) ·R 𝐶) = (𝐴 ·R (𝐵 ·R 𝐶)))
42		dmmulsr 11046	. . 3 ⊢ dom ·R = (R × R)
43		0nsr 11039	. . 3 ⊢ ¬ ∅ ∈ R
44	42, 43	ndmovass 7580	. 2 ⊢ (¬ (𝐴 ∈ R ∧ 𝐵 ∈ R ∧ 𝐶 ∈ R) → ((𝐴 ·R 𝐵) ·R 𝐶) = (𝐴 ·R (𝐵 ·R 𝐶)))
45	41, 44	pm2.61i 182	1 ⊢ ((𝐴 ·R 𝐵) ·R 𝐶) = (𝐴 ·R (𝐵 ·R 𝐶))

Syntax hints:   ∧ wa 395   ∧ w3a 1086   = wceq 1540   ∈ wcel 2109  (class class class)co 7390  Pcnp 10819   +_P cpp 10821   ·_P cmp 10822   ~_R cer 10824  Rcnr 10825   ·_R cmr 10830

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2008  ax-8 2111  ax-9 2119  ax-10 2142  ax-11 2158  ax-12 2178  ax-ext 2702  ax-sep 5254  ax-nul 5264  ax-pow 5323  ax-pr 5390  ax-un 7714  ax-inf2 9601

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3or 1087  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-nf 1784  df-sb 2066  df-mo 2534  df-eu 2563  df-clab 2709  df-cleq 2722  df-clel 2804  df-nfc 2879  df-ne 2927  df-ral 3046  df-rex 3055  df-rmo 3356  df-reu 3357  df-rab 3409  df-v 3452  df-sbc 3757  df-csb 3866  df-dif 3920  df-un 3922  df-in 3924  df-ss 3934  df-pss 3937  df-nul 4300  df-if 4492  df-pw 4568  df-sn 4593  df-pr 4595  df-op 4599  df-uni 4875  df-int 4914  df-iun 4960  df-br 5111  df-opab 5173  df-mpt 5192  df-tr 5218  df-id 5536  df-eprel 5541  df-po 5549  df-so 5550  df-fr 5594  df-we 5596  df-xp 5647  df-rel 5648  df-cnv 5649  df-co 5650  df-dm 5651  df-rn 5652  df-res 5653  df-ima 5654  df-pred 6277  df-ord 6338  df-on 6339  df-lim 6340  df-suc 6341  df-iota 6467  df-fun 6516  df-fn 6517  df-f 6518  df-f1 6519  df-fo 6520  df-f1o 6521  df-fv 6522  df-ov 7393  df-oprab 7394  df-mpo 7395  df-om 7846  df-1st 7971  df-2nd 7972  df-frecs 8263  df-wrecs 8294  df-recs 8343  df-rdg 8381  df-1o 8437  df-oadd 8441  df-omul 8442  df-er 8674  df-ec 8676  df-qs 8680  df-ni 10832  df-pli 10833  df-mi 10834  df-lti 10835  df-plpq 10868  df-mpq 10869  df-ltpq 10870  df-enq 10871  df-nq 10872  df-erq 10873  df-plq 10874  df-mq 10875  df-1nq 10876  df-rq 10877  df-ltnq 10878  df-np 10941  df-plp 10943  df-mp 10944  df-ltp 10945  df-enr 11015  df-nr 11016  df-mr 11018

This theorem is referenced by:  sqgt0sr  11066  recexsr  11067  axmulass  11117