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Theorem mulcomsr 10122
Description: Multiplication of signed reals is commutative. (Contributed by NM, 31-Aug-1995.) (Revised by Mario Carneiro, 28-Apr-2015.) (New usage is discouraged.)
Assertion
Ref Expression
mulcomsr (𝐴 ·R 𝐵) = (𝐵 ·R 𝐴)

Proof of Theorem mulcomsr
Dummy variables 𝑤 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 df-nr 10090 . . 3 R = ((P × P) / ~R )
2 mulsrpr 10109 . . 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 10109 . . 3 (((𝑧P𝑤P) ∧ (𝑥P𝑦P)) → ([⟨𝑧, 𝑤⟩] ~R ·R [⟨𝑥, 𝑦⟩] ~R ) = [⟨((𝑧 ·P 𝑥) +P (𝑤 ·P 𝑦)), ((𝑧 ·P 𝑦) +P (𝑤 ·P 𝑥))⟩] ~R )
4 mulcompr 10057 . . . 4 (𝑥 ·P 𝑧) = (𝑧 ·P 𝑥)
5 mulcompr 10057 . . . 4 (𝑦 ·P 𝑤) = (𝑤 ·P 𝑦)
64, 5oveq12i 6826 . . 3 ((𝑥 ·P 𝑧) +P (𝑦 ·P 𝑤)) = ((𝑧 ·P 𝑥) +P (𝑤 ·P 𝑦))
7 mulcompr 10057 . . . . 5 (𝑥 ·P 𝑤) = (𝑤 ·P 𝑥)
8 mulcompr 10057 . . . . 5 (𝑦 ·P 𝑧) = (𝑧 ·P 𝑦)
97, 8oveq12i 6826 . . . 4 ((𝑥 ·P 𝑤) +P (𝑦 ·P 𝑧)) = ((𝑤 ·P 𝑥) +P (𝑧 ·P 𝑦))
10 addcompr 10055 . . . 4 ((𝑤 ·P 𝑥) +P (𝑧 ·P 𝑦)) = ((𝑧 ·P 𝑦) +P (𝑤 ·P 𝑥))
119, 10eqtri 2782 . . 3 ((𝑥 ·P 𝑤) +P (𝑦 ·P 𝑧)) = ((𝑧 ·P 𝑦) +P (𝑤 ·P 𝑥))
121, 2, 3, 6, 11ecovcom 8022 . 2 ((𝐴R𝐵R) → (𝐴 ·R 𝐵) = (𝐵 ·R 𝐴))
13 dmmulsr 10119 . . 3 dom ·R = (R × R)
1413ndmovcom 6987 . 2 (¬ (𝐴R𝐵R) → (𝐴 ·R 𝐵) = (𝐵 ·R 𝐴))
1512, 14pm2.61i 176 1 (𝐴 ·R 𝐵) = (𝐵 ·R 𝐴)
Colors of variables: wff setvar class
Syntax hints:  wa 383   = wceq 1632  wcel 2139  (class class class)co 6814  Pcnp 9893   +P cpp 9895   ·P cmp 9896   ~R cer 9898  Rcnr 9899   ·R cmr 9904
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1871  ax-4 1886  ax-5 1988  ax-6 2054  ax-7 2090  ax-8 2141  ax-9 2148  ax-10 2168  ax-11 2183  ax-12 2196  ax-13 2391  ax-ext 2740  ax-sep 4933  ax-nul 4941  ax-pow 4992  ax-pr 5055  ax-un 7115  ax-inf2 8713
This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3or 1073  df-3an 1074  df-tru 1635  df-ex 1854  df-nf 1859  df-sb 2047  df-eu 2611  df-mo 2612  df-clab 2747  df-cleq 2753  df-clel 2756  df-nfc 2891  df-ne 2933  df-ral 3055  df-rex 3056  df-reu 3057  df-rmo 3058  df-rab 3059  df-v 3342  df-sbc 3577  df-csb 3675  df-dif 3718  df-un 3720  df-in 3722  df-ss 3729  df-pss 3731  df-nul 4059  df-if 4231  df-pw 4304  df-sn 4322  df-pr 4324  df-tp 4326  df-op 4328  df-uni 4589  df-int 4628  df-iun 4674  df-br 4805  df-opab 4865  df-mpt 4882  df-tr 4905  df-id 5174  df-eprel 5179  df-po 5187  df-so 5188  df-fr 5225  df-we 5227  df-xp 5272  df-rel 5273  df-cnv 5274  df-co 5275  df-dm 5276  df-rn 5277  df-res 5278  df-ima 5279  df-pred 5841  df-ord 5887  df-on 5888  df-lim 5889  df-suc 5890  df-iota 6012  df-fun 6051  df-fn 6052  df-f 6053  df-f1 6054  df-fo 6055  df-f1o 6056  df-fv 6057  df-ov 6817  df-oprab 6818  df-mpt2 6819  df-om 7232  df-1st 7334  df-2nd 7335  df-wrecs 7577  df-recs 7638  df-rdg 7676  df-1o 7730  df-oadd 7734  df-omul 7735  df-er 7913  df-ec 7915  df-qs 7919  df-ni 9906  df-pli 9907  df-mi 9908  df-lti 9909  df-plpq 9942  df-mpq 9943  df-ltpq 9944  df-enq 9945  df-nq 9946  df-erq 9947  df-plq 9948  df-mq 9949  df-1nq 9950  df-rq 9951  df-ltnq 9952  df-np 10015  df-plp 10017  df-mp 10018  df-ltp 10019  df-enr 10089  df-nr 10090  df-mr 10092
This theorem is referenced by:  sqgt0sr  10139  mulresr  10172  axmulcom  10188  axmulass  10190  axcnre  10197
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