Theorem divelunit 10335

Description: A condition for a ratio to be a member of the closed unit. (Contributed by Scott Fenton, 11-Jun-2013.)

Assertion

Ref	Expression
divelunit	|- ( ( ( A e. RR /\ 0 <_ A ) /\ ( B e. RR /\ 0 < B ) ) -> ( ( A / B ) e. ( 0 [,] 1 ) <-> A <_ B ) )

Proof of Theorem divelunit

Step	Hyp	Ref	Expression
1		0re 8274	. . . 4 |- 0 e. RR
2		1re 8273	. . . 4 |- 1 e. RR
3	1, 2	elicc2i 10272	. . 3 |- ( ( A / B ) e. ( 0 [,] 1 ) <-> ( ( A / B ) e. RR /\ 0 <_ ( A / B ) /\ ( A / B ) <_ 1 ) )
4		df-3an 1007	. . 3 |- ( ( ( A / B ) e. RR /\ 0 <_ ( A / B ) /\ ( A / B ) <_ 1 ) <-> ( ( ( A / B ) e. RR /\ 0 <_ ( A / B ) ) /\ ( A / B ) <_ 1 ) )
5	3, 4	bitri 184	. 2 |- ( ( A / B ) e. ( 0 [,] 1 ) <-> ( ( ( A / B ) e. RR /\ 0 <_ ( A / B ) ) /\ ( A / B ) <_ 1 ) )
6		ledivmul 9151	. . . . 5 |- ( ( A e. RR /\ 1 e. RR /\ ( B e. RR /\ 0 < B ) ) -> ( ( A / B ) <_ 1 <-> A <_ ( B x. 1 ) ) )
7	2, 6	mp3an2 1362	. . . 4 |- ( ( A e. RR /\ ( B e. RR /\ 0 < B ) ) -> ( ( A / B ) <_ 1 <-> A <_ ( B x. 1 ) ) )
8	7	adantlr 477	. . 3 |- ( ( ( A e. RR /\ 0 <_ A ) /\ ( B e. RR /\ 0 < B ) ) -> ( ( A / B ) <_ 1 <-> A <_ ( B x. 1 ) ) )
9		simpll 527	. . . . . 6 |- ( ( ( A e. RR /\ 0 <_ A ) /\ ( B e. RR /\ 0 < B ) ) -> A e. RR )
10		simprl 531	. . . . . 6 |- ( ( ( A e. RR /\ 0 <_ A ) /\ ( B e. RR /\ 0 < B ) ) -> B e. RR )
11		gt0ap0 8900	. . . . . . 7 |- ( ( B e. RR /\ 0 < B ) -> B # 0 )
12	11	adantl 277	. . . . . 6 |- ( ( ( A e. RR /\ 0 <_ A ) /\ ( B e. RR /\ 0 < B ) ) -> B # 0 )
13	9, 10, 12	redivclapd 9109	. . . . 5 |- ( ( ( A e. RR /\ 0 <_ A ) /\ ( B e. RR /\ 0 < B ) ) -> ( A / B ) e. RR )
14		divge0 9147	. . . . 5 |- ( ( ( A e. RR /\ 0 <_ A ) /\ ( B e. RR /\ 0 < B ) ) -> 0 <_ ( A / B ) )
15	13, 14	jca 306	. . . 4 |- ( ( ( A e. RR /\ 0 <_ A ) /\ ( B e. RR /\ 0 < B ) ) -> ( ( A / B ) e. RR /\ 0 <_ ( A / B ) ) )
16	15	biantrurd 305	. . 3 |- ( ( ( A e. RR /\ 0 <_ A ) /\ ( B e. RR /\ 0 < B ) ) -> ( ( A / B ) <_ 1 <-> ( ( ( A / B ) e. RR /\ 0 <_ ( A / B ) ) /\ ( A / B ) <_ 1 ) ) )
17		recn 8260	. . . . . 6 |- ( B e. RR -> B e. CC )
18	17	ad2antrl 490	. . . . 5 |- ( ( ( A e. RR /\ 0 <_ A ) /\ ( B e. RR /\ 0 < B ) ) -> B e. CC )
19	18	mulridd 8291	. . . 4 |- ( ( ( A e. RR /\ 0 <_ A ) /\ ( B e. RR /\ 0 < B ) ) -> ( B x. 1 ) = B )
20	19	breq2d 4121	. . 3 |- ( ( ( A e. RR /\ 0 <_ A ) /\ ( B e. RR /\ 0 < B ) ) -> ( A <_ ( B x. 1 ) <-> A <_ B ) )
21	8, 16, 20	3bitr3d 218	. 2 |- ( ( ( A e. RR /\ 0 <_ A ) /\ ( B e. RR /\ 0 < B ) ) -> ( ( ( ( A / B ) e. RR /\ 0 <_ ( A / B ) ) /\ ( A / B ) <_ 1 ) <-> A <_ B ) )
22	5, 21	bitrid 192	1 |- ( ( ( A e. RR /\ 0 <_ A ) /\ ( B e. RR /\ 0 < B ) ) -> ( ( A / B ) e. ( 0 [,] 1 ) <-> A <_ B ) )

Syntax hints:   -> wi 4   /\ wa 104   <-> wb 105   /\ w3a 1005   e. wcel 2203   class class class wbr 4109  (class class class)co 6050   CCcc 8125   RRcr 8126   0cc0 8127   1c1 8128   x. cmul 8132   < clt 8308   <_ cle 8309   # cap 8855   / cdiv 8946   [,]cicc 10224

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 2205  ax-14 2206  ax-ext 2214  ax-sep 4228  ax-pow 4287  ax-pr 4322  ax-un 4554  ax-setind 4659  ax-cnex 8218  ax-resscn 8219  ax-1cn 8220  ax-1re 8221  ax-icn 8222  ax-addcl 8223  ax-addrcl 8224  ax-mulcl 8225  ax-mulrcl 8226  ax-addcom 8227  ax-mulcom 8228  ax-addass 8229  ax-mulass 8230  ax-distr 8231  ax-i2m1 8232  ax-0lt1 8233  ax-1rid 8234  ax-0id 8235  ax-rnegex 8236  ax-precex 8237  ax-cnre 8238  ax-pre-ltirr 8239  ax-pre-ltwlin 8240  ax-pre-lttrn 8241  ax-pre-apti 8242  ax-pre-ltadd 8243  ax-pre-mulgt0 8244  ax-pre-mulext 8245

This theorem depends on definitions:  df-bi 117  df-3or 1006  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1812  df-eu 2083  df-mo 2084  df-clab 2219  df-cleq 2225  df-clel 2228  df-nfc 2373  df-ne 2413  df-nel 2508  df-ral 2525  df-rex 2526  df-reu 2527  df-rmo 2528  df-rab 2529  df-v 2815  df-sbc 3043  df-dif 3213  df-un 3215  df-in 3217  df-ss 3224  df-pw 3671  df-sn 3695  df-pr 3696  df-op 3698  df-uni 3915  df-br 4110  df-opab 4172  df-id 4414  df-po 4417  df-iso 4418  df-xp 4755  df-rel 4756  df-cnv 4757  df-co 4758  df-dm 4759  df-iota 5312  df-fun 5354  df-fv 5360  df-riota 6003  df-ov 6053  df-oprab 6054  df-mpo 6055  df-pnf 8310  df-mnf 8311  df-xr 8312  df-ltxr 8313  df-le 8314  df-sub 8446  df-neg 8447  df-reap 8849  df-ap 8856  df-div 8947  df-icc 10228

This theorem is referenced by: (None)