Theorem mulasssr 11082

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 11048	. . 3 ⊢ R = ((P × P) / ~R )
2		mulsrpr 11068	. . 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 11068	. . 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 11068	. . 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 11068	. . 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 11012	. . . . . 6 ⊢ ((𝑥 ∈ P ∧ 𝑧 ∈ P) → (𝑥 ·P 𝑧) ∈ P)
7		mulclpr 11012	. . . . . 6 ⊢ ((𝑦 ∈ P ∧ 𝑤 ∈ P) → (𝑦 ·P 𝑤) ∈ P)
8		addclpr 11010	. . . . . 6 ⊢ (((𝑥 ·P 𝑧) ∈ P ∧ (𝑦 ·P 𝑤) ∈ P) → ((𝑥 ·P 𝑧) +P (𝑦 ·P 𝑤)) ∈ P)
9	6, 7, 8	syl2an 597	. . . . 5 ⊢ (((𝑥 ∈ P ∧ 𝑧 ∈ P) ∧ (𝑦 ∈ P ∧ 𝑤 ∈ P)) → ((𝑥 ·P 𝑧) +P (𝑦 ·P 𝑤)) ∈ P)
10	9	an4s 659	. . . 4 ⊢ (((𝑥 ∈ P ∧ 𝑦 ∈ P) ∧ (𝑧 ∈ P ∧ 𝑤 ∈ P)) → ((𝑥 ·P 𝑧) +P (𝑦 ·P 𝑤)) ∈ P)
11		mulclpr 11012	. . . . . 6 ⊢ ((𝑥 ∈ P ∧ 𝑤 ∈ P) → (𝑥 ·P 𝑤) ∈ P)
12		mulclpr 11012	. . . . . 6 ⊢ ((𝑦 ∈ P ∧ 𝑧 ∈ P) → (𝑦 ·P 𝑧) ∈ P)
13		addclpr 11010	. . . . . 6 ⊢ (((𝑥 ·P 𝑤) ∈ P ∧ (𝑦 ·P 𝑧) ∈ P) → ((𝑥 ·P 𝑤) +P (𝑦 ·P 𝑧)) ∈ P)
14	11, 12, 13	syl2an 597	. . . . 5 ⊢ (((𝑥 ∈ P ∧ 𝑤 ∈ P) ∧ (𝑦 ∈ P ∧ 𝑧 ∈ P)) → ((𝑥 ·P 𝑤) +P (𝑦 ·P 𝑧)) ∈ P)
15	14	an42s 660	. . . 4 ⊢ (((𝑥 ∈ P ∧ 𝑦 ∈ P) ∧ (𝑧 ∈ P ∧ 𝑤 ∈ P)) → ((𝑥 ·P 𝑤) +P (𝑦 ·P 𝑧)) ∈ P)
16	10, 15	jca 513	. . 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 11012	. . . . . 6 ⊢ ((𝑧 ∈ P ∧ 𝑣 ∈ P) → (𝑧 ·P 𝑣) ∈ P)
18		mulclpr 11012	. . . . . 6 ⊢ ((𝑤 ∈ P ∧ 𝑢 ∈ P) → (𝑤 ·P 𝑢) ∈ P)
19		addclpr 11010	. . . . . 6 ⊢ (((𝑧 ·P 𝑣) ∈ P ∧ (𝑤 ·P 𝑢) ∈ P) → ((𝑧 ·P 𝑣) +P (𝑤 ·P 𝑢)) ∈ P)
20	17, 18, 19	syl2an 597	. . . . 5 ⊢ (((𝑧 ∈ P ∧ 𝑣 ∈ P) ∧ (𝑤 ∈ P ∧ 𝑢 ∈ P)) → ((𝑧 ·P 𝑣) +P (𝑤 ·P 𝑢)) ∈ P)
21	20	an4s 659	. . . 4 ⊢ (((𝑧 ∈ P ∧ 𝑤 ∈ P) ∧ (𝑣 ∈ P ∧ 𝑢 ∈ P)) → ((𝑧 ·P 𝑣) +P (𝑤 ·P 𝑢)) ∈ P)
22		mulclpr 11012	. . . . . 6 ⊢ ((𝑧 ∈ P ∧ 𝑢 ∈ P) → (𝑧 ·P 𝑢) ∈ P)
23		mulclpr 11012	. . . . . 6 ⊢ ((𝑤 ∈ P ∧ 𝑣 ∈ P) → (𝑤 ·P 𝑣) ∈ P)
24		addclpr 11010	. . . . . 6 ⊢ (((𝑧 ·P 𝑢) ∈ P ∧ (𝑤 ·P 𝑣) ∈ P) → ((𝑧 ·P 𝑢) +P (𝑤 ·P 𝑣)) ∈ P)
25	22, 23, 24	syl2an 597	. . . . 5 ⊢ (((𝑧 ∈ P ∧ 𝑢 ∈ P) ∧ (𝑤 ∈ P ∧ 𝑣 ∈ P)) → ((𝑧 ·P 𝑢) +P (𝑤 ·P 𝑣)) ∈ P)
26	25	an42s 660	. . . 4 ⊢ (((𝑧 ∈ P ∧ 𝑤 ∈ P) ∧ (𝑣 ∈ P ∧ 𝑢 ∈ P)) → ((𝑧 ·P 𝑢) +P (𝑤 ·P 𝑣)) ∈ P)
27	21, 26	jca 513	. . 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 3479	. . . 4 ⊢ 𝑥 ∈ V
29		vex 3479	. . . 4 ⊢ 𝑦 ∈ V
30		vex 3479	. . . 4 ⊢ 𝑧 ∈ V
31		mulcompr 11015	. . . 4 ⊢ (𝑓 ·P 𝑔) = (𝑔 ·P 𝑓)
32		distrpr 11020	. . . 4 ⊢ (𝑓 ·P (𝑔 +P ℎ)) = ((𝑓 ·P 𝑔) +P (𝑓 ·P ℎ))
33		vex 3479	. . . 4 ⊢ 𝑤 ∈ V
34		vex 3479	. . . 4 ⊢ 𝑣 ∈ V
35		mulasspr 11016	. . . 4 ⊢ ((𝑓 ·P 𝑔) ·P ℎ) = (𝑓 ·P (𝑔 ·P ℎ))
36		vex 3479	. . . 4 ⊢ 𝑢 ∈ V
37		addcompr 11013	. . . 4 ⊢ (𝑓 +P 𝑔) = (𝑔 +P 𝑓)
38		addasspr 11014	. . . 4 ⊢ ((𝑓 +P 𝑔) +P ℎ) = (𝑓 +P (𝑔 +P ℎ))
39	28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38	caovlem2 7640	. . 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 7640	. . 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 8815	. 2 ⊢ ((𝐴 ∈ R ∧ 𝐵 ∈ R ∧ 𝐶 ∈ R) → ((𝐴 ·R 𝐵) ·R 𝐶) = (𝐴 ·R (𝐵 ·R 𝐶)))
42		dmmulsr 11078	. . 3 ⊢ dom ·R = (R × R)
43		0nsr 11071	. . 3 ⊢ ¬ ∅ ∈ R
44	42, 43	ndmovass 7592	. 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 397   ∧ w3a 1088   = wceq 1542   ∈ wcel 2107  (class class class)co 7406  Pcnp 10851   +_P cpp 10853   ·_P cmp 10854   ~_R cer 10856  Rcnr 10857   ·_R cmr 10862

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1798  ax-4 1812  ax-5 1914  ax-6 1972  ax-7 2012  ax-8 2109  ax-9 2117  ax-10 2138  ax-11 2155  ax-12 2172  ax-ext 2704  ax-sep 5299  ax-nul 5306  ax-pow 5363  ax-pr 5427  ax-un 7722  ax-inf2 9633

This theorem depends on definitions:  df-bi 206  df-an 398  df-or 847  df-3or 1089  df-3an 1090  df-tru 1545  df-fal 1555  df-ex 1783  df-nf 1787  df-sb 2069  df-mo 2535  df-eu 2564  df-clab 2711  df-cleq 2725  df-clel 2811  df-nfc 2886  df-ne 2942  df-ral 3063  df-rex 3072  df-rmo 3377  df-reu 3378  df-rab 3434  df-v 3477  df-sbc 3778  df-csb 3894  df-dif 3951  df-un 3953  df-in 3955  df-ss 3965  df-pss 3967  df-nul 4323  df-if 4529  df-pw 4604  df-sn 4629  df-pr 4631  df-op 4635  df-uni 4909  df-int 4951  df-iun 4999  df-br 5149  df-opab 5211  df-mpt 5232  df-tr 5266  df-id 5574  df-eprel 5580  df-po 5588  df-so 5589  df-fr 5631  df-we 5633  df-xp 5682  df-rel 5683  df-cnv 5684  df-co 5685  df-dm 5686  df-rn 5687  df-res 5688  df-ima 5689  df-pred 6298  df-ord 6365  df-on 6366  df-lim 6367  df-suc 6368  df-iota 6493  df-fun 6543  df-fn 6544  df-f 6545  df-f1 6546  df-fo 6547  df-f1o 6548  df-fv 6549  df-ov 7409  df-oprab 7410  df-mpo 7411  df-om 7853  df-1st 7972  df-2nd 7973  df-frecs 8263  df-wrecs 8294  df-recs 8368  df-rdg 8407  df-1o 8463  df-oadd 8467  df-omul 8468  df-er 8700  df-ec 8702  df-qs 8706  df-ni 10864  df-pli 10865  df-mi 10866  df-lti 10867  df-plpq 10900  df-mpq 10901  df-ltpq 10902  df-enq 10903  df-nq 10904  df-erq 10905  df-plq 10906  df-mq 10907  df-1nq 10908  df-rq 10909  df-ltnq 10910  df-np 10973  df-plp 10975  df-mp 10976  df-ltp 10977  df-enr 11047  df-nr 11048  df-mr 11050

This theorem is referenced by:  sqgt0sr  11098  recexsr  11099  axmulass  11149