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Theorem hisubcomi 10603
Description: Two vector subtractions simultaneously commute in an inner product.
Hypotheses
Ref Expression
hisubcom.1 |- A e. ~H
hisubcom.2 |- B e. ~H
hisubcom.3 |- C e. ~H
hisubcom.4 |- D e. ~H
Assertion
Ref Expression
hisubcomi |- ((A -h B) .ih (C -h D)) = ((B -h A) .ih (D -h C))

Proof of Theorem hisubcomi
StepHypRef Expression
1 hisubcom.2 . . . 4 |- B e. ~H
2 hisubcom.1 . . . 4 |- A e. ~H
31, 2hvnegdii 10561 . . 3 |- (-u1 .h (B -h A)) = (A -h B)
4 hisubcom.4 . . . 4 |- D e. ~H
5 hisubcom.3 . . . 4 |- C e. ~H
64, 5hvnegdii 10561 . . 3 |- (-u1 .h (D -h C)) = (C -h D)
73, 6opreq12i 4894 . 2 |- ((-u1 .h (B -h A)) .ih (-u1 .h (D -h C))) = ((A -h B) .ih (C -h D))
8 ax1cn 6422 . . . . 5 |- 1 e. CC
98negcli 6526 . . . 4 |- -u1 e. CC
101, 2hvsubcli 10523 . . . 4 |- (B -h A) e. ~H
114, 5hvsubcli 10523 . . . 4 |- (D -h C) e. ~H
129, 9, 10, 11his35i 10588 . . 3 |- ((-u1 .h (B -h A)) .ih (-u1 .h (D -h C))) = ((-u1 x. (*` -u1)) x. ((B -h A) .ih (D -h C)))
13 1re 6598 . . . . . . . 8 |- 1 e. RR
1413renegcli 6576 . . . . . . 7 |- -u1 e. RR
15 cjre 8060 . . . . . . 7 |- (-u1 e. RR -> (*` -u1) = -u1)
1614, 15ax-mp 7 . . . . . 6 |- (*` -u1) = -u1
1716opreq2i 4893 . . . . 5 |- (-u1 x. (*` -u1)) = (-u1 x. -u1)
188, 8mul2negi 6610 . . . . 5 |- (-u1 x. -u1) = (1 x. 1)
198mulid1i 6485 . . . . 5 |- (1 x. 1) = 1
2017, 18, 193eqtri 1912 . . . 4 |- (-u1 x. (*` -u1)) = 1
2120opreq1i 4892 . . 3 |- ((-u1 x. (*` -u1)) x. ((B -h A) .ih (D -h C))) = (1 x. ((B -h A) .ih (D -h C)))
2210, 11hicli 10581 . . . 4 |- ((B -h A) .ih (D -h C)) e. CC
2322mulid2i 6486 . . 3 |- (1 x. ((B -h A) .ih (D -h C))) = ((B -h A) .ih (D -h C))
2412, 21, 233eqtri 1912 . 2 |- ((-u1 .h (B -h A)) .ih (-u1 .h (D -h C))) = ((B -h A) .ih (D -h C))
257, 24eqtr3i 1910 1 |- ((A -h B) .ih (C -h D)) = ((B -h A) .ih (D -h C))
Colors of variables: wff set class
Syntax hints:   = wceq 1298   e. wcel 1300  ` cfv 3998  (class class class)co 4884  RRcr 6385  1c1 6387   x. cmul 6391  -ucneg 6446  *ccj 7999  ~Hchil 10420   .h csm 10422   -h cmv 10424   .ih csp 10425
This theorem is referenced by:  lnophmlem2 11579
This theorem was proved from axioms:  ax-1 4  ax-2 5  ax-3 6  ax-mp 7  ax-7 1304  ax-gen 1305  ax-8 1306  ax-9 1307  ax-10 1308  ax-11 1309  ax-12 1310  ax-13 1311  ax-14 1312  ax-17 1317  ax-4 1319  ax-5o 1321  ax-6o 1324  ax-9o 1481  ax-10o 1500  ax-16 1580  ax-11o 1588  ax-ext 1865  ax-rep 3428  ax-sep 3438  ax-nul 3445  ax-pow 3481  ax-pr 3524  ax-un 3790  ax-inf2 5731  ax-hfvadd 10502  ax-hvcom 10503  ax-hfvmul 10507  ax-hvmulid 10508  ax-hvmulass 10509  ax-hvdistr1 10510  ax-hfi 10579  ax-his1 10582  ax-his3 10584
This theorem depends on definitions:  df-bi 164  df-or 241  df-an 242  df-3or 859  df-3an 860  df-ex 1327  df-sb 1536  df-eu 1775  df-mo 1776  df-clab 1872  df-cleq 1877  df-clel 1880  df-ne 2019  df-nel 2020  df-ral 2109  df-rex 2110  df-reu 2111  df-rab 2112  df-v 2294  df-sbc 2454  df-csb 2541  df-dif 2597  df-un 2600  df-in 2603  df-ss 2605  df-pss 2607  df-nul 2876  df-if 2983  df-pw 3035  df-sn 3049  df-pr 3050  df-tp 3052  df-op 3053  df-uni 3178  df-int 3215  df-iun 3257  df-br 3339  df-opab 3396  df-tr 3412  df-eprel 3583  df-id 3586  df-po 3591  df-so 3604  df-fr 3625  df-we 3644  df-ord 3660  df-on 3661  df-lim 3662  df-suc 3663  df-om 3950  df-xp 4000  df-rel 4001  df-cnv 4002  df-co 4003  df-dm 4004  df-rn 4005  df-res 4006  df-ima 4007  df-fun 4008  df-fn 4009  df-f 4010  df-f1 4011  df-fo 4012  df-f1o 4013  df-fv 4014  df-opr 4886  df-oprab 4887  df-mpt 5006  df-1st 5020  df-2nd 5021  df-iota 5089  df-rdg 5140  df-1o 5177  df-oadd 5179  df-omul 5180  df-er 5318  df-ec 5320  df-qs 5323  df-en 5427  df-dom 5428  df-sdom 5429  df-undef 5556  df-riota 5560  df-ni 6152  df-pli 6153  df-mi 6154  df-lti 6155  df-plpq 6187  df-mpq 6188  df-enq 6189  df-nq 6190  df-plq 6191  df-mq 6192  df-rq 6193  df-ltq 6194  df-1q 6195  df-np 6238  df-1p 6239  df-plp 6240  df-mp 6241  df-ltp 6242  df-plpr 6316  df-mpr 6317  df-enr 6318  df-nr 6319  df-plr 6320  df-mr 6321  df-ltr 6322  df-0r 6323  df-1r 6324  df-m1r 6325  df-c 6392  df-0 6393  df-1 6394  df-i 6395  df-r 6396  df-plus 6397  df-mul 6398  df-lt 6399  df-sub 6511  df-neg 6513  df-pnf 6654  df-mnf 6655  df-xr 6656  df-ltxr 6657  df-le 6658  df-div 6892  df-re 8001  df-im 8002  df-cj 8003  df-hvsub 10472
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