Theorem mulclsr 9905

Description: Closure of multiplication on signed reals. (Contributed by NM, 10-Aug-1995.) (New usage is discouraged.)

Assertion

Ref	Expression
mulclsr	|- ( ( A e. R. /\ B e. R. ) -> ( A .R B ) e. R. )

Proof of Theorem mulclsr

Dummy variables x y z w are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		df-nr 9878	. . 3 |- R. = ( ( P. X. P. ) /. ~R )
2		oveq1 6657	. . . 4 |- ( [ <. x , y >. ] ~R = A -> ( [ <. x , y >. ] ~R .R [ <. z , w >. ] ~R ) = ( A .R [ <. z , w >. ] ~R ) )
3	2	eleq1d 2686	. . 3 |- ( [ <. x , y >. ] ~R = A -> ( ( [ <. x , y >. ] ~R .R [ <. z , w >. ] ~R ) e. ( ( P. X. P. ) /. ~R ) <-> ( A .R [ <. z , w >. ] ~R ) e. ( ( P. X. P. ) /. ~R ) ) )
4		oveq2 6658	. . . 4 |- ( [ <. z , w >. ] ~R = B -> ( A .R [ <. z , w >. ] ~R ) = ( A .R B ) )
5	4	eleq1d 2686	. . 3 |- ( [ <. z , w >. ] ~R = B -> ( ( A .R [ <. z , w >. ] ~R ) e. ( ( P. X. P. ) /. ~R ) <-> ( A .R B ) e. ( ( P. X. P. ) /. ~R ) ) )
6		mulsrpr 9897	. . . 4 |- ( ( ( x e. P. /\ y e. P. ) /\ ( z e. P. /\ w e. P. ) ) -> ( [ <. x , y >. ] ~R .R [ <. z , w >. ] ~R ) = [ <. ( ( x .P. z ) +P. ( y .P. w ) ) , ( ( x .P. w ) +P. ( y .P. z ) ) >. ] ~R )
7		mulclpr 9842	. . . . . . . 8 |- ( ( x e. P. /\ z e. P. ) -> ( x .P. z ) e. P. )
8		mulclpr 9842	. . . . . . . 8 |- ( ( y e. P. /\ w e. P. ) -> ( y .P. w ) e. P. )
9		addclpr 9840	. . . . . . . 8 |- ( ( ( x .P. z ) e. P. /\ ( y .P. w ) e. P. ) -> ( ( x .P. z ) +P. ( y .P. w ) ) e. P. )
10	7, 8, 9	syl2an 494	. . . . . . 7 |- ( ( ( x e. P. /\ z e. P. ) /\ ( y e. P. /\ w e. P. ) ) -> ( ( x .P. z ) +P. ( y .P. w ) ) e. P. )
11	10	an4s 869	. . . . . 6 |- ( ( ( x e. P. /\ y e. P. ) /\ ( z e. P. /\ w e. P. ) ) -> ( ( x .P. z ) +P. ( y .P. w ) ) e. P. )
12		mulclpr 9842	. . . . . . . 8 |- ( ( x e. P. /\ w e. P. ) -> ( x .P. w ) e. P. )
13		mulclpr 9842	. . . . . . . 8 |- ( ( y e. P. /\ z e. P. ) -> ( y .P. z ) e. P. )
14		addclpr 9840	. . . . . . . 8 |- ( ( ( x .P. w ) e. P. /\ ( y .P. z ) e. P. ) -> ( ( x .P. w ) +P. ( y .P. z ) ) e. P. )
15	12, 13, 14	syl2an 494	. . . . . . 7 |- ( ( ( x e. P. /\ w e. P. ) /\ ( y e. P. /\ z e. P. ) ) -> ( ( x .P. w ) +P. ( y .P. z ) ) e. P. )
16	15	an42s 870	. . . . . 6 |- ( ( ( x e. P. /\ y e. P. ) /\ ( z e. P. /\ w e. P. ) ) -> ( ( x .P. w ) +P. ( y .P. z ) ) e. P. )
17	11, 16	jca 554	. . . . 5 |- ( ( ( x e. P. /\ y e. P. ) /\ ( z e. P. /\ w e. P. ) ) -> ( ( ( x .P. z ) +P. ( y .P. w ) ) e. P. /\ ( ( x .P. w ) +P. ( y .P. z ) ) e. P. ) )
18		opelxpi 5148	. . . . 5 |- ( ( ( ( x .P. z ) +P. ( y .P. w ) ) e. P. /\ ( ( x .P. w ) +P. ( y .P. z ) ) e. P. ) -> <. ( ( x .P. z ) +P. ( y .P. w ) ) , ( ( x .P. w ) +P. ( y .P. z ) ) >. e. ( P. X. P. ) )
19		enrex 9888	. . . . . 6 |- ~R e. _V
20	19	ecelqsi 7803	. . . . 5 |- ( <. ( ( x .P. z ) +P. ( y .P. w ) ) , ( ( x .P. w ) +P. ( y .P. z ) ) >. e. ( P. X. P. ) -> [ <. ( ( x .P. z ) +P. ( y .P. w ) ) , ( ( x .P. w ) +P. ( y .P. z ) ) >. ] ~R e. ( ( P. X. P. ) /. ~R ) )
21	17, 18, 20	3syl 18	. . . 4 |- ( ( ( x e. P. /\ y e. P. ) /\ ( z e. P. /\ w e. P. ) ) -> [ <. ( ( x .P. z ) +P. ( y .P. w ) ) , ( ( x .P. w ) +P. ( y .P. z ) ) >. ] ~R e. ( ( P. X. P. ) /. ~R ) )
22	6, 21	eqeltrd 2701	. . 3 |- ( ( ( x e. P. /\ y e. P. ) /\ ( z e. P. /\ w e. P. ) ) -> ( [ <. x , y >. ] ~R .R [ <. z , w >. ] ~R ) e. ( ( P. X. P. ) /. ~R ) )
23	1, 3, 5, 22	2ecoptocl 7838	. 2 |- ( ( A e. R. /\ B e. R. ) -> ( A .R B ) e. ( ( P. X. P. ) /. ~R ) )
24	23, 1	syl6eleqr 2712	1 |- ( ( A e. R. /\ B e. R. ) -> ( A .R B ) e. R. )

Syntax hints:   -> wi 4   /\ wa 384   = wceq 1483   e. wcel 1990   <.cop 4183   X. cxp 5112  (class class class)co 6650   [cec 7740   /.cqs 7741   P.cnp 9681   +P. cpp 9683   .P. cmp 9684   ~R cer 9686   R.cnr 9687   .R cmr 9692

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-8 1992  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-sep 4781  ax-nul 4789  ax-pow 4843  ax-pr 4906  ax-un 6949  ax-inf2 8538

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1038  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ne 2795  df-ral 2917  df-rex 2918  df-reu 2919  df-rmo 2920  df-rab 2921  df-v 3202  df-sbc 3436  df-csb 3534  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-pss 3590  df-nul 3916  df-if 4087  df-pw 4160  df-sn 4178  df-pr 4180  df-tp 4182  df-op 4184  df-uni 4437  df-int 4476  df-iun 4522  df-br 4654  df-opab 4713  df-mpt 4730  df-tr 4753  df-id 5024  df-eprel 5029  df-po 5035  df-so 5036  df-fr 5073  df-we 5075  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-rn 5125  df-res 5126  df-ima 5127  df-pred 5680  df-ord 5726  df-on 5727  df-lim 5728  df-suc 5729  df-iota 5851  df-fun 5890  df-fn 5891  df-f 5892  df-f1 5893  df-fo 5894  df-f1o 5895  df-fv 5896  df-ov 6653  df-oprab 6654  df-mpt2 6655  df-om 7066  df-1st 7168  df-2nd 7169  df-wrecs 7407  df-recs 7468  df-rdg 7506  df-1o 7560  df-oadd 7564  df-omul 7565  df-er 7742  df-ec 7744  df-qs 7748  df-ni 9694  df-pli 9695  df-mi 9696  df-lti 9697  df-plpq 9730  df-mpq 9731  df-ltpq 9732  df-enq 9733  df-nq 9734  df-erq 9735  df-plq 9736  df-mq 9737  df-1nq 9738  df-rq 9739  df-ltnq 9740  df-np 9803  df-plp 9805  df-mp 9806  df-ltp 9807  df-enr 9877  df-nr 9878  df-mr 9880

This theorem is referenced by:  dmmulsr  9907  negexsr  9923  sqgt0sr  9927  recexsr  9928  map2psrpr  9931  mulresr  9960  axmulf  9967  axmulrcl  9975  axmulass  9978  axdistr  9979  axrnegex  9983