Theorem mulclsr 8071

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

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 8044	. . 3 |- R. = ( ( P. X. P. ) /. ~R )
2		oveq1 6059	. . . 4 |- ( [ <. x , y >. ] ~R = A -> ( [ <. x , y >. ] ~R .R [ <. z , w >. ] ~R ) = ( A .R [ <. z , w >. ] ~R ) )
3	2	eleq1d 2303	. . 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 6060	. . . 4 |- ( [ <. z , w >. ] ~R = B -> ( A .R [ <. z , w >. ] ~R ) = ( A .R B ) )
5	4	eleq1d 2303	. . 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 8063	. . . 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 7889	. . . . . . . 8 |- ( ( x e. P. /\ z e. P. ) -> ( x .P. z ) e. P. )
8		mulclpr 7889	. . . . . . . 8 |- ( ( y e. P. /\ w e. P. ) -> ( y .P. w ) e. P. )
9		addclpr 7854	. . . . . . . 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 289	. . . . . . 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 592	. . . . . 6 |- ( ( ( x e. P. /\ y e. P. ) /\ ( z e. P. /\ w e. P. ) ) -> ( ( x .P. z ) +P. ( y .P. w ) ) e. P. )
12		mulclpr 7889	. . . . . . . 8 |- ( ( x e. P. /\ w e. P. ) -> ( x .P. w ) e. P. )
13		mulclpr 7889	. . . . . . . 8 |- ( ( y e. P. /\ z e. P. ) -> ( y .P. z ) e. P. )
14		addclpr 7854	. . . . . . . 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 289	. . . . . . 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 593	. . . . . 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 306	. . . . 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 4783	. . . . 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 8054	. . . . . 6 |- ~R e. _V
20	19	ecelqsi 6825	. . . . 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 17	. . . 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 2311	. . 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 6859	. 2 |- ( ( A e. R. /\ B e. R. ) -> ( A .R B ) e. ( ( P. X. P. ) /. ~R ) )
24	23, 1	eleqtrrdi 2328	1 |- ( ( A e. R. /\ B e. R. ) -> ( A .R B ) e. R. )

Syntax hints:   -> wi 4   /\ wa 104   = wceq 1398   e. wcel 2205   <.cop 3694   X. cxp 4749  (class class class)co 6052   [cec 6767   /.cqs 6768   P.cnp 7608   +P. cpp 7610   .P. cmp 7611   ~R cer 7613   R.cnr 7614   .R cmr 7619

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 619  ax-in2 620  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2207  ax-14 2208  ax-ext 2216  ax-coll 4227  ax-sep 4230  ax-nul 4238  ax-pow 4289  ax-pr 4324  ax-un 4556  ax-setind 4661  ax-iinf 4712

This theorem depends on definitions:  df-bi 117  df-dc 843  df-3or 1006  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1812  df-eu 2085  df-mo 2086  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ne 2415  df-ral 2527  df-rex 2528  df-reu 2529  df-rab 2531  df-v 2817  df-sbc 3045  df-csb 3141  df-dif 3215  df-un 3217  df-in 3219  df-ss 3226  df-nul 3511  df-pw 3673  df-sn 3697  df-pr 3698  df-op 3700  df-uni 3917  df-int 3952  df-iun 3995  df-br 4112  df-opab 4174  df-mpt 4175  df-tr 4211  df-eprel 4412  df-id 4416  df-po 4419  df-iso 4420  df-iord 4489  df-on 4491  df-suc 4494  df-iom 4715  df-xp 4757  df-rel 4758  df-cnv 4759  df-co 4760  df-dm 4761  df-rn 4762  df-res 4763  df-ima 4764  df-iota 5314  df-fun 5356  df-fn 5357  df-f 5358  df-f1 5359  df-fo 5360  df-f1o 5361  df-fv 5362  df-ov 6055  df-oprab 6056  df-mpo 6057  df-1st 6336  df-2nd 6337  df-recs 6538  df-irdg 6603  df-1o 6649  df-2o 6650  df-oadd 6653  df-omul 6654  df-er 6769  df-ec 6771  df-qs 6775  df-ni 7621  df-pli 7622  df-mi 7623  df-lti 7624  df-plpq 7661  df-mpq 7662  df-enq 7664  df-nqqs 7665  df-plqqs 7666  df-mqqs 7667  df-1nqqs 7668  df-rq 7669  df-ltnqqs 7670  df-enq0 7741  df-nq0 7742  df-0nq0 7743  df-plq0 7744  df-mq0 7745  df-inp 7783  df-iplp 7785  df-imp 7786  df-enr 8043  df-nr 8044  df-mr 8046

This theorem is referenced by:  pn0sr  8088  negexsr  8089  caucvgsrlemoffval  8113  caucvgsrlemofff  8114  map2psrprg  8122  mulcnsr  8152  mulresr  8155  mulcnsrec  8160  axmulcl  8183  axmulrcl  8184  axmulcom  8188  axmulass  8190  axdistr  8191  axrnegex  8196