Theorem divelunit 10159

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 8107	. . . 4 |- 0 e. RR
2		1re 8106	. . . 4 |- 1 e. RR
3	1, 2	elicc2i 10096	. . 3 |- ( ( A / B ) e. ( 0 [,] 1 ) <-> ( ( A / B ) e. RR /\ 0 <_ ( A / B ) /\ ( A / B ) <_ 1 ) )
4		df-3an 983	. . 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 8985	. . . . 5 |- ( ( A e. RR /\ 1 e. RR /\ ( B e. RR /\ 0 < B ) ) -> ( ( A / B ) <_ 1 <-> A <_ ( B x. 1 ) ) )
7	2, 6	mp3an2 1338	. . . 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 529	. . . . . 6 |- ( ( ( A e. RR /\ 0 <_ A ) /\ ( B e. RR /\ 0 < B ) ) -> B e. RR )
11		gt0ap0 8734	. . . . . . 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 8943	. . . . 5 |- ( ( ( A e. RR /\ 0 <_ A ) /\ ( B e. RR /\ 0 < B ) ) -> ( A / B ) e. RR )
14		divge0 8981	. . . . 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 8093	. . . . . 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 8124	. . . 4 |- ( ( ( A e. RR /\ 0 <_ A ) /\ ( B e. RR /\ 0 < B ) ) -> ( B x. 1 ) = B )
20	19	breq2d 4071	. . 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 981   e. wcel 2178   class class class wbr 4059  (class class class)co 5967   CCcc 7958   RRcr 7959   0cc0 7960   1c1 7961   x. cmul 7965   < clt 8142   <_ cle 8143   # cap 8689   / cdiv 8780   [,]cicc 10048

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 615  ax-in2 616  ax-io 711  ax-5 1471  ax-7 1472  ax-gen 1473  ax-ie1 1517  ax-ie2 1518  ax-8 1528  ax-10 1529  ax-11 1530  ax-i12 1531  ax-bndl 1533  ax-4 1534  ax-17 1550  ax-i9 1554  ax-ial 1558  ax-i5r 1559  ax-13 2180  ax-14 2181  ax-ext 2189  ax-sep 4178  ax-pow 4234  ax-pr 4269  ax-un 4498  ax-setind 4603  ax-cnex 8051  ax-resscn 8052  ax-1cn 8053  ax-1re 8054  ax-icn 8055  ax-addcl 8056  ax-addrcl 8057  ax-mulcl 8058  ax-mulrcl 8059  ax-addcom 8060  ax-mulcom 8061  ax-addass 8062  ax-mulass 8063  ax-distr 8064  ax-i2m1 8065  ax-0lt1 8066  ax-1rid 8067  ax-0id 8068  ax-rnegex 8069  ax-precex 8070  ax-cnre 8071  ax-pre-ltirr 8072  ax-pre-ltwlin 8073  ax-pre-lttrn 8074  ax-pre-apti 8075  ax-pre-ltadd 8076  ax-pre-mulgt0 8077  ax-pre-mulext 8078

This theorem depends on definitions:  df-bi 117  df-3or 982  df-3an 983  df-tru 1376  df-fal 1379  df-nf 1485  df-sb 1787  df-eu 2058  df-mo 2059  df-clab 2194  df-cleq 2200  df-clel 2203  df-nfc 2339  df-ne 2379  df-nel 2474  df-ral 2491  df-rex 2492  df-reu 2493  df-rmo 2494  df-rab 2495  df-v 2778  df-sbc 3006  df-dif 3176  df-un 3178  df-in 3180  df-ss 3187  df-pw 3628  df-sn 3649  df-pr 3650  df-op 3652  df-uni 3865  df-br 4060  df-opab 4122  df-id 4358  df-po 4361  df-iso 4362  df-xp 4699  df-rel 4700  df-cnv 4701  df-co 4702  df-dm 4703  df-iota 5251  df-fun 5292  df-fv 5298  df-riota 5922  df-ov 5970  df-oprab 5971  df-mpo 5972  df-pnf 8144  df-mnf 8145  df-xr 8146  df-ltxr 8147  df-le 8148  df-sub 8280  df-neg 8281  df-reap 8683  df-ap 8690  df-div 8781  df-icc 10052

This theorem is referenced by: (None)