Theorem submul2 8556

Description: Convert a subtraction to addition using multiplication by a negative. (Contributed by NM, 2-Feb-2007.)

Assertion

Ref	Expression
submul2	|- ( ( A e. CC /\ B e. CC /\ C e. CC ) -> ( A - ( B x. C ) ) = ( A + ( B x. -u C ) ) )

Proof of Theorem submul2

Step	Hyp	Ref	Expression
1		mulneg2 8553	. . . . 5 |- ( ( B e. CC /\ C e. CC ) -> ( B x. -u C ) = -u ( B x. C ) )
2	1	adantl 277	. . . 4 |- ( ( A e. CC /\ ( B e. CC /\ C e. CC ) ) -> ( B x. -u C ) = -u ( B x. C ) )
3	2	oveq2d 6023	. . 3 |- ( ( A e. CC /\ ( B e. CC /\ C e. CC ) ) -> ( A + ( B x. -u C ) ) = ( A + -u ( B x. C ) ) )
4		mulcl 8137	. . . 4 |- ( ( B e. CC /\ C e. CC ) -> ( B x. C ) e. CC )
5		negsub 8405	. . . 4 |- ( ( A e. CC /\ ( B x. C ) e. CC ) -> ( A + -u ( B x. C ) ) = ( A - ( B x. C ) ) )
6	4, 5	sylan2 286	. . 3 |- ( ( A e. CC /\ ( B e. CC /\ C e. CC ) ) -> ( A + -u ( B x. C ) ) = ( A - ( B x. C ) ) )
7	3, 6	eqtr2d 2263	. 2 |- ( ( A e. CC /\ ( B e. CC /\ C e. CC ) ) -> ( A - ( B x. C ) ) = ( A + ( B x. -u C ) ) )
8	7	3impb 1223	1 |- ( ( A e. CC /\ B e. CC /\ C e. CC ) -> ( A - ( B x. C ) ) = ( A + ( B x. -u C ) ) )

Syntax hints:   -> wi 4   /\ wa 104   /\ w3a 1002   = wceq 1395   e. wcel 2200  (class class class)co 6007   CCcc 8008   + caddc 8013   x. cmul 8015   - cmin 8328   -ucneg 8329

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-14 2203  ax-ext 2211  ax-sep 4202  ax-pow 4258  ax-pr 4293  ax-setind 4629  ax-resscn 8102  ax-1cn 8103  ax-icn 8105  ax-addcl 8106  ax-addrcl 8107  ax-mulcl 8108  ax-addcom 8110  ax-mulcom 8111  ax-addass 8112  ax-distr 8114  ax-i2m1 8115  ax-0id 8118  ax-rnegex 8119  ax-cnre 8121

This theorem depends on definitions:  df-bi 117  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-dif 3199  df-un 3201  df-in 3203  df-ss 3210  df-pw 3651  df-sn 3672  df-pr 3673  df-op 3675  df-uni 3889  df-br 4084  df-opab 4146  df-id 4384  df-xp 4725  df-rel 4726  df-cnv 4727  df-co 4728  df-dm 4729  df-iota 5278  df-fun 5320  df-fv 5326  df-riota 5960  df-ov 6010  df-oprab 6011  df-mpo 6012  df-sub 8330  df-neg 8331

This theorem is referenced by:  cjap  11432