Theorem absmul 10946

Description: Absolute value distributes over multiplication. Proposition 10-3.7(f) of [Gleason] p. 133. (Contributed by NM, 11-Oct-1999.) (Revised by Mario Carneiro, 29-May-2016.)

Assertion

Ref	Expression
absmul	|- ( ( A e. CC /\ B e. CC ) -> ( abs ` ( A x. B ) ) = ( ( abs ` A ) x. ( abs ` B ) ) )

Proof of Theorem absmul

Step	Hyp	Ref	Expression
1		cjmul 10762	. . . . . 6 |- ( ( A e. CC /\ B e. CC ) -> ( * ` ( A x. B ) ) = ( ( * ` A ) x. ( * ` B ) ) )
2	1	oveq2d 5830	. . . . 5 |- ( ( A e. CC /\ B e. CC ) -> ( ( A x. B ) x. ( * ` ( A x. B ) ) ) = ( ( A x. B ) x. ( ( * ` A ) x. ( * ` B ) ) ) )
3		simpl 108	. . . . . 6 |- ( ( A e. CC /\ B e. CC ) -> A e. CC )
4		simpr 109	. . . . . 6 |- ( ( A e. CC /\ B e. CC ) -> B e. CC )
5	3	cjcld 10817	. . . . . 6 |- ( ( A e. CC /\ B e. CC ) -> ( * ` A ) e. CC )
6	4	cjcld 10817	. . . . . 6 |- ( ( A e. CC /\ B e. CC ) -> ( * ` B ) e. CC )
7	3, 4, 5, 6	mul4d 8009	. . . . 5 |- ( ( A e. CC /\ B e. CC ) -> ( ( A x. B ) x. ( ( * ` A ) x. ( * ` B ) ) ) = ( ( A x. ( * ` A ) ) x. ( B x. ( * ` B ) ) ) )
8	2, 7	eqtrd 2187	. . . 4 |- ( ( A e. CC /\ B e. CC ) -> ( ( A x. B ) x. ( * ` ( A x. B ) ) ) = ( ( A x. ( * ` A ) ) x. ( B x. ( * ` B ) ) ) )
9	8	fveq2d 5465	. . 3 |- ( ( A e. CC /\ B e. CC ) -> ( sqr ` ( ( A x. B ) x. ( * ` ( A x. B ) ) ) ) = ( sqr ` ( ( A x. ( * ` A ) ) x. ( B x. ( * ` B ) ) ) ) )
10		cjmulrcl 10764	. . . . 5 |- ( A e. CC -> ( A x. ( * ` A ) ) e. RR )
11		cjmulge0 10766	. . . . 5 |- ( A e. CC -> 0 <_ ( A x. ( * ` A ) ) )
12	10, 11	jca 304	. . . 4 |- ( A e. CC -> ( ( A x. ( * ` A ) ) e. RR /\ 0 <_ ( A x. ( * ` A ) ) ) )
13		cjmulrcl 10764	. . . . 5 |- ( B e. CC -> ( B x. ( * ` B ) ) e. RR )
14		cjmulge0 10766	. . . . 5 |- ( B e. CC -> 0 <_ ( B x. ( * ` B ) ) )
15	13, 14	jca 304	. . . 4 |- ( B e. CC -> ( ( B x. ( * ` B ) ) e. RR /\ 0 <_ ( B x. ( * ` B ) ) ) )
16		sqrtmul 10912	. . . 4 |- ( ( ( ( A x. ( * ` A ) ) e. RR /\ 0 <_ ( A x. ( * ` A ) ) ) /\ ( ( B x. ( * ` B ) ) e. RR /\ 0 <_ ( B x. ( * ` B ) ) ) ) -> ( sqr ` ( ( A x. ( * ` A ) ) x. ( B x. ( * ` B ) ) ) ) = ( ( sqr ` ( A x. ( * ` A ) ) ) x. ( sqr ` ( B x. ( * ` B ) ) ) ) )
17	12, 15, 16	syl2an 287	. . 3 |- ( ( A e. CC /\ B e. CC ) -> ( sqr ` ( ( A x. ( * ` A ) ) x. ( B x. ( * ` B ) ) ) ) = ( ( sqr ` ( A x. ( * ` A ) ) ) x. ( sqr ` ( B x. ( * ` B ) ) ) ) )
18	9, 17	eqtrd 2187	. 2 |- ( ( A e. CC /\ B e. CC ) -> ( sqr ` ( ( A x. B ) x. ( * ` ( A x. B ) ) ) ) = ( ( sqr ` ( A x. ( * ` A ) ) ) x. ( sqr ` ( B x. ( * ` B ) ) ) ) )
19		mulcl 7838	. . 3 |- ( ( A e. CC /\ B e. CC ) -> ( A x. B ) e. CC )
20		absval 10878	. . 3 |- ( ( A x. B ) e. CC -> ( abs ` ( A x. B ) ) = ( sqr ` ( ( A x. B ) x. ( * ` ( A x. B ) ) ) ) )
21	19, 20	syl 14	. 2 |- ( ( A e. CC /\ B e. CC ) -> ( abs ` ( A x. B ) ) = ( sqr ` ( ( A x. B ) x. ( * ` ( A x. B ) ) ) ) )
22		absval 10878	. . 3 |- ( A e. CC -> ( abs ` A ) = ( sqr ` ( A x. ( * ` A ) ) ) )
23		absval 10878	. . 3 |- ( B e. CC -> ( abs ` B ) = ( sqr ` ( B x. ( * ` B ) ) ) )
24	22, 23	oveqan12d 5833	. 2 |- ( ( A e. CC /\ B e. CC ) -> ( ( abs ` A ) x. ( abs ` B ) ) = ( ( sqr ` ( A x. ( * ` A ) ) ) x. ( sqr ` ( B x. ( * ` B ) ) ) ) )
25	18, 21, 24	3eqtr4d 2197	1 |- ( ( A e. CC /\ B e. CC ) -> ( abs ` ( A x. B ) ) = ( ( abs ` A ) x. ( abs ` B ) ) )

Syntax hints:   -> wi 4   /\ wa 103   = wceq 1332   e. wcel 2125   class class class wbr 3961   ` cfv 5163  (class class class)co 5814   CCcc 7709   RRcr 7710   0cc0 7711   x. cmul 7716   <_ cle 7892   *ccj 10716   sqrcsqrt 10873   abscabs 10874

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 604  ax-in2 605  ax-io 699  ax-5 1424  ax-7 1425  ax-gen 1426  ax-ie1 1470  ax-ie2 1471  ax-8 1481  ax-10 1482  ax-11 1483  ax-i12 1484  ax-bndl 1486  ax-4 1487  ax-17 1503  ax-i9 1507  ax-ial 1511  ax-i5r 1512  ax-13 2127  ax-14 2128  ax-ext 2136  ax-coll 4075  ax-sep 4078  ax-nul 4086  ax-pow 4130  ax-pr 4164  ax-un 4388  ax-setind 4490  ax-iinf 4541  ax-cnex 7802  ax-resscn 7803  ax-1cn 7804  ax-1re 7805  ax-icn 7806  ax-addcl 7807  ax-addrcl 7808  ax-mulcl 7809  ax-mulrcl 7810  ax-addcom 7811  ax-mulcom 7812  ax-addass 7813  ax-mulass 7814  ax-distr 7815  ax-i2m1 7816  ax-0lt1 7817  ax-1rid 7818  ax-0id 7819  ax-rnegex 7820  ax-precex 7821  ax-cnre 7822  ax-pre-ltirr 7823  ax-pre-ltwlin 7824  ax-pre-lttrn 7825  ax-pre-apti 7826  ax-pre-ltadd 7827  ax-pre-mulgt0 7828  ax-pre-mulext 7829  ax-arch 7830  ax-caucvg 7831

This theorem depends on definitions:  df-bi 116  df-dc 821  df-3or 964  df-3an 965  df-tru 1335  df-fal 1338  df-nf 1438  df-sb 1740  df-eu 2006  df-mo 2007  df-clab 2141  df-cleq 2147  df-clel 2150  df-nfc 2285  df-ne 2325  df-nel 2420  df-ral 2437  df-rex 2438  df-reu 2439  df-rmo 2440  df-rab 2441  df-v 2711  df-sbc 2934  df-csb 3028  df-dif 3100  df-un 3102  df-in 3104  df-ss 3111  df-nul 3391  df-if 3502  df-pw 3541  df-sn 3562  df-pr 3563  df-op 3565  df-uni 3769  df-int 3804  df-iun 3847  df-br 3962  df-opab 4022  df-mpt 4023  df-tr 4059  df-id 4248  df-po 4251  df-iso 4252  df-iord 4321  df-on 4323  df-ilim 4324  df-suc 4326  df-iom 4544  df-xp 4585  df-rel 4586  df-cnv 4587  df-co 4588  df-dm 4589  df-rn 4590  df-res 4591  df-ima 4592  df-iota 5128  df-fun 5165  df-fn 5166  df-f 5167  df-f1 5168  df-fo 5169  df-f1o 5170  df-fv 5171  df-riota 5770  df-ov 5817  df-oprab 5818  df-mpo 5819  df-1st 6078  df-2nd 6079  df-recs 6242  df-frec 6328  df-pnf 7893  df-mnf 7894  df-xr 7895  df-ltxr 7896  df-le 7897  df-sub 8027  df-neg 8028  df-reap 8429  df-ap 8436  df-div 8525  df-inn 8813  df-2 8871  df-3 8872  df-4 8873  df-n0 9070  df-z 9147  df-uz 9419  df-rp 9539  df-seqfrec 10323  df-exp 10397  df-cj 10719  df-re 10720  df-im 10721  df-rsqrt 10875  df-abs 10876

This theorem is referenced by:  absdivap  10947  absexp  10956  absimle  10961  abstri  10981  absmuli  11028  absmuld  11071  ef01bndlem  11630  absmulgcd  11872  gcdmultiplez  11876