Theorem mulclsr 7941

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 7914	. . 3 |- R. = ( ( P. X. P. ) /. ~R )
2		oveq1 6008	. . . 4 |- ( [ <. x , y >. ] ~R = A -> ( [ <. x , y >. ] ~R .R [ <. z , w >. ] ~R ) = ( A .R [ <. z , w >. ] ~R ) )
3	2	eleq1d 2298	. . 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 6009	. . . 4 |- ( [ <. z , w >. ] ~R = B -> ( A .R [ <. z , w >. ] ~R ) = ( A .R B ) )
5	4	eleq1d 2298	. . 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 7933	. . . 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 7759	. . . . . . . 8 |- ( ( x e. P. /\ z e. P. ) -> ( x .P. z ) e. P. )
8		mulclpr 7759	. . . . . . . 8 |- ( ( y e. P. /\ w e. P. ) -> ( y .P. w ) e. P. )
9		addclpr 7724	. . . . . . . 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 590	. . . . . 6 |- ( ( ( x e. P. /\ y e. P. ) /\ ( z e. P. /\ w e. P. ) ) -> ( ( x .P. z ) +P. ( y .P. w ) ) e. P. )
12		mulclpr 7759	. . . . . . . 8 |- ( ( x e. P. /\ w e. P. ) -> ( x .P. w ) e. P. )
13		mulclpr 7759	. . . . . . . 8 |- ( ( y e. P. /\ z e. P. ) -> ( y .P. z ) e. P. )
14		addclpr 7724	. . . . . . . 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 591	. . . . . 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 4751	. . . . 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 7924	. . . . . 6 |- ~R e. _V
20	19	ecelqsi 6736	. . . . 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 2306	. . 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 6770	. 2 |- ( ( A e. R. /\ B e. R. ) -> ( A .R B ) e. ( ( P. X. P. ) /. ~R ) )
24	23, 1	eleqtrrdi 2323	1 |- ( ( A e. R. /\ B e. R. ) -> ( A .R B ) e. R. )

Syntax hints:   -> wi 4   /\ wa 104   = wceq 1395   e. wcel 2200   <.cop 3669   X. cxp 4717  (class class class)co 6001   [cec 6678   /.cqs 6679   P.cnp 7478   +P. cpp 7480   .P. cmp 7481   ~R cer 7483   R.cnr 7484   .R cmr 7489

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 617  ax-in2 618  ax-io 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-13 2202  ax-14 2203  ax-ext 2211  ax-coll 4199  ax-sep 4202  ax-nul 4210  ax-pow 4258  ax-pr 4293  ax-un 4524  ax-setind 4629  ax-iinf 4680

This theorem depends on definitions:  df-bi 117  df-dc 840  df-3or 1003  df-3an 1004  df-tru 1398  df-fal 1401  df-nf 1507  df-sb 1809  df-eu 2080  df-mo 2081  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ne 2401  df-ral 2513  df-rex 2514  df-reu 2515  df-rab 2517  df-v 2801  df-sbc 3029  df-csb 3125  df-dif 3199  df-un 3201  df-in 3203  df-ss 3210  df-nul 3492  df-pw 3651  df-sn 3672  df-pr 3673  df-op 3675  df-uni 3889  df-int 3924  df-iun 3967  df-br 4084  df-opab 4146  df-mpt 4147  df-tr 4183  df-eprel 4380  df-id 4384  df-po 4387  df-iso 4388  df-iord 4457  df-on 4459  df-suc 4462  df-iom 4683  df-xp 4725  df-rel 4726  df-cnv 4727  df-co 4728  df-dm 4729  df-rn 4730  df-res 4731  df-ima 4732  df-iota 5278  df-fun 5320  df-fn 5321  df-f 5322  df-f1 5323  df-fo 5324  df-f1o 5325  df-fv 5326  df-ov 6004  df-oprab 6005  df-mpo 6006  df-1st 6286  df-2nd 6287  df-recs 6451  df-irdg 6516  df-1o 6562  df-2o 6563  df-oadd 6566  df-omul 6567  df-er 6680  df-ec 6682  df-qs 6686  df-ni 7491  df-pli 7492  df-mi 7493  df-lti 7494  df-plpq 7531  df-mpq 7532  df-enq 7534  df-nqqs 7535  df-plqqs 7536  df-mqqs 7537  df-1nqqs 7538  df-rq 7539  df-ltnqqs 7540  df-enq0 7611  df-nq0 7612  df-0nq0 7613  df-plq0 7614  df-mq0 7615  df-inp 7653  df-iplp 7655  df-imp 7656  df-enr 7913  df-nr 7914  df-mr 7916

This theorem is referenced by:  pn0sr  7958  negexsr  7959  caucvgsrlemoffval  7983  caucvgsrlemofff  7984  map2psrprg  7992  mulcnsr  8022  mulresr  8025  mulcnsrec  8030  axmulcl  8053  axmulrcl  8054  axmulcom  8058  axmulass  8060  axdistr  8061  axrnegex  8066