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Theorem mulasssr 9790
 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 𝑢 𝑣 𝑤 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 df-nr 9757 . . 3 R = ((P × P) / ~R )
2 mulsrpr 9776 . . 3 (((𝑥P𝑦P) ∧ (𝑧P𝑤P)) → ([⟨𝑥, 𝑦⟩] ~R ·R [⟨𝑧, 𝑤⟩] ~R ) = [⟨((𝑥 ·P 𝑧) +P (𝑦 ·P 𝑤)), ((𝑥 ·P 𝑤) +P (𝑦 ·P 𝑧))⟩] ~R )
3 mulsrpr 9776 . . 3 (((𝑧P𝑤P) ∧ (𝑣P𝑢P)) → ([⟨𝑧, 𝑤⟩] ~R ·R [⟨𝑣, 𝑢⟩] ~R ) = [⟨((𝑧 ·P 𝑣) +P (𝑤 ·P 𝑢)), ((𝑧 ·P 𝑢) +P (𝑤 ·P 𝑣))⟩] ~R )
4 mulsrpr 9776 . . 3 (((((𝑥 ·P 𝑧) +P (𝑦 ·P 𝑤)) ∈ P ∧ ((𝑥 ·P 𝑤) +P (𝑦 ·P 𝑧)) ∈ P) ∧ (𝑣P𝑢P)) → ([⟨((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 9776 . . 3 (((𝑥P𝑦P) ∧ (((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 9721 . . . . . 6 ((𝑥P𝑧P) → (𝑥 ·P 𝑧) ∈ P)
7 mulclpr 9721 . . . . . 6 ((𝑦P𝑤P) → (𝑦 ·P 𝑤) ∈ P)
8 addclpr 9719 . . . . . 6 (((𝑥 ·P 𝑧) ∈ P ∧ (𝑦 ·P 𝑤) ∈ P) → ((𝑥 ·P 𝑧) +P (𝑦 ·P 𝑤)) ∈ P)
96, 7, 8syl2an 493 . . . . 5 (((𝑥P𝑧P) ∧ (𝑦P𝑤P)) → ((𝑥 ·P 𝑧) +P (𝑦 ·P 𝑤)) ∈ P)
109an4s 865 . . . 4 (((𝑥P𝑦P) ∧ (𝑧P𝑤P)) → ((𝑥 ·P 𝑧) +P (𝑦 ·P 𝑤)) ∈ P)
11 mulclpr 9721 . . . . . 6 ((𝑥P𝑤P) → (𝑥 ·P 𝑤) ∈ P)
12 mulclpr 9721 . . . . . 6 ((𝑦P𝑧P) → (𝑦 ·P 𝑧) ∈ P)
13 addclpr 9719 . . . . . 6 (((𝑥 ·P 𝑤) ∈ P ∧ (𝑦 ·P 𝑧) ∈ P) → ((𝑥 ·P 𝑤) +P (𝑦 ·P 𝑧)) ∈ P)
1411, 12, 13syl2an 493 . . . . 5 (((𝑥P𝑤P) ∧ (𝑦P𝑧P)) → ((𝑥 ·P 𝑤) +P (𝑦 ·P 𝑧)) ∈ P)
1514an42s 866 . . . 4 (((𝑥P𝑦P) ∧ (𝑧P𝑤P)) → ((𝑥 ·P 𝑤) +P (𝑦 ·P 𝑧)) ∈ P)
1610, 15jca 553 . . 3 (((𝑥P𝑦P) ∧ (𝑧P𝑤P)) → (((𝑥 ·P 𝑧) +P (𝑦 ·P 𝑤)) ∈ P ∧ ((𝑥 ·P 𝑤) +P (𝑦 ·P 𝑧)) ∈ P))
17 mulclpr 9721 . . . . . 6 ((𝑧P𝑣P) → (𝑧 ·P 𝑣) ∈ P)
18 mulclpr 9721 . . . . . 6 ((𝑤P𝑢P) → (𝑤 ·P 𝑢) ∈ P)
19 addclpr 9719 . . . . . 6 (((𝑧 ·P 𝑣) ∈ P ∧ (𝑤 ·P 𝑢) ∈ P) → ((𝑧 ·P 𝑣) +P (𝑤 ·P 𝑢)) ∈ P)
2017, 18, 19syl2an 493 . . . . 5 (((𝑧P𝑣P) ∧ (𝑤P𝑢P)) → ((𝑧 ·P 𝑣) +P (𝑤 ·P 𝑢)) ∈ P)
2120an4s 865 . . . 4 (((𝑧P𝑤P) ∧ (𝑣P𝑢P)) → ((𝑧 ·P 𝑣) +P (𝑤 ·P 𝑢)) ∈ P)
22 mulclpr 9721 . . . . . 6 ((𝑧P𝑢P) → (𝑧 ·P 𝑢) ∈ P)
23 mulclpr 9721 . . . . . 6 ((𝑤P𝑣P) → (𝑤 ·P 𝑣) ∈ P)
24 addclpr 9719 . . . . . 6 (((𝑧 ·P 𝑢) ∈ P ∧ (𝑤 ·P 𝑣) ∈ P) → ((𝑧 ·P 𝑢) +P (𝑤 ·P 𝑣)) ∈ P)
2522, 23, 24syl2an 493 . . . . 5 (((𝑧P𝑢P) ∧ (𝑤P𝑣P)) → ((𝑧 ·P 𝑢) +P (𝑤 ·P 𝑣)) ∈ P)
2625an42s 866 . . . 4 (((𝑧P𝑤P) ∧ (𝑣P𝑢P)) → ((𝑧 ·P 𝑢) +P (𝑤 ·P 𝑣)) ∈ P)
2721, 26jca 553 . . 3 (((𝑧P𝑤P) ∧ (𝑣P𝑢P)) → (((𝑧 ·P 𝑣) +P (𝑤 ·P 𝑢)) ∈ P ∧ ((𝑧 ·P 𝑢) +P (𝑤 ·P 𝑣)) ∈ P))
28 vex 3176 . . . 4 𝑥 ∈ V
29 vex 3176 . . . 4 𝑦 ∈ V
30 vex 3176 . . . 4 𝑧 ∈ V
31 mulcompr 9724 . . . 4 (𝑓 ·P 𝑔) = (𝑔 ·P 𝑓)
32 distrpr 9729 . . . 4 (𝑓 ·P (𝑔 +P )) = ((𝑓 ·P 𝑔) +P (𝑓 ·P ))
33 vex 3176 . . . 4 𝑤 ∈ V
34 vex 3176 . . . 4 𝑣 ∈ V
35 mulasspr 9725 . . . 4 ((𝑓 ·P 𝑔) ·P ) = (𝑓 ·P (𝑔 ·P ))
36 vex 3176 . . . 4 𝑢 ∈ V
37 addcompr 9722 . . . 4 (𝑓 +P 𝑔) = (𝑔 +P 𝑓)
38 addasspr 9723 . . . 4 ((𝑓 +P 𝑔) +P ) = (𝑓 +P (𝑔 +P ))
3928, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38caovlem2 6768 . . 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))))
4028, 29, 30, 31, 32, 33, 36, 35, 34, 37, 38caovlem2 6768 . . 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))))
411, 2, 3, 4, 5, 16, 27, 39, 40ecovass 7742 . 2 ((𝐴R𝐵R𝐶R) → ((𝐴 ·R 𝐵) ·R 𝐶) = (𝐴 ·R (𝐵 ·R 𝐶)))
42 dmmulsr 9786 . . 3 dom ·R = (R × R)
43 0nsr 9779 . . 3 ¬ ∅ ∈ R
4442, 43ndmovass 6720 . 2 (¬ (𝐴R𝐵R𝐶R) → ((𝐴 ·R 𝐵) ·R 𝐶) = (𝐴 ·R (𝐵 ·R 𝐶)))
4541, 44pm2.61i 175 1 ((𝐴 ·R 𝐵) ·R 𝐶) = (𝐴 ·R (𝐵 ·R 𝐶))
 Colors of variables: wff setvar class Syntax hints:   ∧ wa 383   ∧ w3a 1031   = wceq 1475   ∈ wcel 1977  (class class class)co 6549  Pcnp 9560   +P cpp 9562   ·P cmp 9563   ~R cer 9565  Rcnr 9566   ·R cmr 9571 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-8 1979  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-sep 4709  ax-nul 4717  ax-pow 4769  ax-pr 4833  ax-un 6847  ax-inf2 8421 This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3or 1032  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-ral 2901  df-rex 2902  df-reu 2903  df-rmo 2904  df-rab 2905  df-v 3175  df-sbc 3403  df-csb 3500  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-pss 3556  df-nul 3875  df-if 4037  df-pw 4110  df-sn 4126  df-pr 4128  df-tp 4130  df-op 4132  df-uni 4373  df-int 4411  df-iun 4457  df-br 4584  df-opab 4644  df-mpt 4645  df-tr 4681  df-eprel 4949  df-id 4953  df-po 4959  df-so 4960  df-fr 4997  df-we 4999  df-xp 5044  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-res 5050  df-ima 5051  df-pred 5597  df-ord 5643  df-on 5644  df-lim 5645  df-suc 5646  df-iota 5768  df-fun 5806  df-fn 5807  df-f 5808  df-f1 5809  df-fo 5810  df-f1o 5811  df-fv 5812  df-ov 6552  df-oprab 6553  df-mpt2 6554  df-om 6958  df-1st 7059  df-2nd 7060  df-wrecs 7294  df-recs 7355  df-rdg 7393  df-1o 7447  df-oadd 7451  df-omul 7452  df-er 7629  df-ec 7631  df-qs 7635  df-ni 9573  df-pli 9574  df-mi 9575  df-lti 9576  df-plpq 9609  df-mpq 9610  df-ltpq 9611  df-enq 9612  df-nq 9613  df-erq 9614  df-plq 9615  df-mq 9616  df-1nq 9617  df-rq 9618  df-ltnq 9619  df-np 9682  df-plp 9684  df-mp 9685  df-ltp 9686  df-enr 9756  df-nr 9757  df-mr 9759 This theorem is referenced by:  sqgt0sr  9806  recexsr  9807  axmulass  9857
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