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Theorem iooref1o 17083
Description: A one-to-one mapping from the real numbers onto the open unit interval. (Contributed by Jim Kingdon, 27-Jun-2024.)
Hypothesis
Ref Expression
iooref1o.f  |-  F  =  ( x  e.  RR  |->  ( 1  /  (
1  +  ( exp `  x ) ) ) )
Assertion
Ref Expression
iooref1o  |-  F : RR
-1-1-onto-> ( 0 (,) 1
)

Proof of Theorem iooref1o
Dummy variable  y is distinct from all other variables.
StepHypRef Expression
1 iooref1o.f . . 3  |-  F  =  ( x  e.  RR  |->  ( 1  /  (
1  +  ( exp `  x ) ) ) )
2 1rp 10058 . . . . . . . . 9  |-  1  e.  RR+
32a1i 9 . . . . . . . 8  |-  ( x  e.  RR  ->  1  e.  RR+ )
4 rpefcl 12452 . . . . . . . 8  |-  ( x  e.  RR  ->  ( exp `  x )  e.  RR+ )
53, 4rpaddcld 10113 . . . . . . 7  |-  ( x  e.  RR  ->  (
1  +  ( exp `  x ) )  e.  RR+ )
65rpreccld 10108 . . . . . 6  |-  ( x  e.  RR  ->  (
1  /  ( 1  +  ( exp `  x
) ) )  e.  RR+ )
76rpred 10097 . . . . 5  |-  ( x  e.  RR  ->  (
1  /  ( 1  +  ( exp `  x
) ) )  e.  RR )
86rpgt0d 10100 . . . . 5  |-  ( x  e.  RR  ->  0  <  ( 1  /  (
1  +  ( exp `  x ) ) ) )
9 1red 8341 . . . . . . 7  |-  ( x  e.  RR  ->  1  e.  RR )
109, 4ltaddrpd 10131 . . . . . 6  |-  ( x  e.  RR  ->  1  <  ( 1  +  ( exp `  x ) ) )
115recgt1d 10112 . . . . . 6  |-  ( x  e.  RR  ->  (
1  <  ( 1  +  ( exp `  x
) )  <->  ( 1  /  ( 1  +  ( exp `  x
) ) )  <  1 ) )
1210, 11mpbid 147 . . . . 5  |-  ( x  e.  RR  ->  (
1  /  ( 1  +  ( exp `  x
) ) )  <  1 )
13 0xr 8372 . . . . . 6  |-  0  e.  RR*
14 1re 8325 . . . . . . 7  |-  1  e.  RR
1514rexri 8383 . . . . . 6  |-  1  e.  RR*
16 elioo2 10323 . . . . . 6  |-  ( ( 0  e.  RR*  /\  1  e.  RR* )  ->  (
( 1  /  (
1  +  ( exp `  x ) ) )  e.  ( 0 (,) 1 )  <->  ( (
1  /  ( 1  +  ( exp `  x
) ) )  e.  RR  /\  0  < 
( 1  /  (
1  +  ( exp `  x ) ) )  /\  ( 1  / 
( 1  +  ( exp `  x ) ) )  <  1
) ) )
1713, 15, 16mp2an 430 . . . . 5  |-  ( ( 1  /  ( 1  +  ( exp `  x
) ) )  e.  ( 0 (,) 1
)  <->  ( ( 1  /  ( 1  +  ( exp `  x
) ) )  e.  RR  /\  0  < 
( 1  /  (
1  +  ( exp `  x ) ) )  /\  ( 1  / 
( 1  +  ( exp `  x ) ) )  <  1
) )
187, 8, 12, 17syl3anbrc 1212 . . . 4  |-  ( x  e.  RR  ->  (
1  /  ( 1  +  ( exp `  x
) ) )  e.  ( 0 (,) 1
) )
1918adantl 277 . . 3  |-  ( ( T.  /\  x  e.  RR )  ->  (
1  /  ( 1  +  ( exp `  x
) ) )  e.  ( 0 (,) 1
) )
20 elioore 10314 . . . . . . . . . 10  |-  ( y  e.  ( 0 (,) 1 )  ->  y  e.  RR )
21 eliooord 10330 . . . . . . . . . . 11  |-  ( y  e.  ( 0 (,) 1 )  ->  (
0  <  y  /\  y  <  1 ) )
2221simpld 112 . . . . . . . . . 10  |-  ( y  e.  ( 0 (,) 1 )  ->  0  <  y )
2320, 22elrpd 10094 . . . . . . . . 9  |-  ( y  e.  ( 0 (,) 1 )  ->  y  e.  RR+ )
2423rpreccld 10108 . . . . . . . 8  |-  ( y  e.  ( 0 (,) 1 )  ->  (
1  /  y )  e.  RR+ )
2524rpred 10097 . . . . . . 7  |-  ( y  e.  ( 0 (,) 1 )  ->  (
1  /  y )  e.  RR )
26 1red 8341 . . . . . . 7  |-  ( y  e.  ( 0 (,) 1 )  ->  1  e.  RR )
2725, 26resubcld 8708 . . . . . 6  |-  ( y  e.  ( 0 (,) 1 )  ->  (
( 1  /  y
)  -  1 )  e.  RR )
2821simprd 114 . . . . . . . 8  |-  ( y  e.  ( 0 (,) 1 )  ->  y  <  1 )
2923reclt1d 10111 . . . . . . . 8  |-  ( y  e.  ( 0 (,) 1 )  ->  (
y  <  1  <->  1  <  ( 1  /  y ) ) )
3028, 29mpbid 147 . . . . . . 7  |-  ( y  e.  ( 0 (,) 1 )  ->  1  <  ( 1  /  y
) )
3126, 25posdifd 8860 . . . . . . 7  |-  ( y  e.  ( 0 (,) 1 )  ->  (
1  <  ( 1  /  y )  <->  0  <  ( ( 1  /  y
)  -  1 ) ) )
3230, 31mpbid 147 . . . . . 6  |-  ( y  e.  ( 0 (,) 1 )  ->  0  <  ( ( 1  / 
y )  -  1 ) )
3327, 32elrpd 10094 . . . . 5  |-  ( y  e.  ( 0 (,) 1 )  ->  (
( 1  /  y
)  -  1 )  e.  RR+ )
3433relogcld 15983 . . . 4  |-  ( y  e.  ( 0 (,) 1 )  ->  ( log `  ( ( 1  /  y )  - 
1 ) )  e.  RR )
3534adantl 277 . . 3  |-  ( ( T.  /\  y  e.  ( 0 (,) 1
) )  ->  ( log `  ( ( 1  /  y )  - 
1 ) )  e.  RR )
36 1cnd 8342 . . . . . . 7  |-  ( ( x  e.  RR  /\  y  e.  ( 0 (,) 1 ) )  ->  1  e.  CC )
374adantr 276 . . . . . . . . 9  |-  ( ( x  e.  RR  /\  y  e.  ( 0 (,) 1 ) )  ->  ( exp `  x
)  e.  RR+ )
3837rpcnd 10099 . . . . . . . 8  |-  ( ( x  e.  RR  /\  y  e.  ( 0 (,) 1 ) )  ->  ( exp `  x
)  e.  CC )
3936, 38addcld 8345 . . . . . . 7  |-  ( ( x  e.  RR  /\  y  e.  ( 0 (,) 1 ) )  ->  ( 1  +  ( exp `  x
) )  e.  CC )
4023adantl 277 . . . . . . . 8  |-  ( ( x  e.  RR  /\  y  e.  ( 0 (,) 1 ) )  ->  y  e.  RR+ )
4140rpcnd 10099 . . . . . . 7  |-  ( ( x  e.  RR  /\  y  e.  ( 0 (,) 1 ) )  ->  y  e.  CC )
4240rpap0d 10103 . . . . . . 7  |-  ( ( x  e.  RR  /\  y  e.  ( 0 (,) 1 ) )  ->  y #  0 )
4336, 39, 41, 42divmulap2d 9154 . . . . . 6  |-  ( ( x  e.  RR  /\  y  e.  ( 0 (,) 1 ) )  ->  ( ( 1  /  y )  =  ( 1  +  ( exp `  x ) )  <->  1  =  ( y  x.  ( 1  +  ( exp `  x
) ) ) ) )
4424adantl 277 . . . . . . . . . 10  |-  ( ( x  e.  RR  /\  y  e.  ( 0 (,) 1 ) )  ->  ( 1  / 
y )  e.  RR+ )
4544rpcnd 10099 . . . . . . . . 9  |-  ( ( x  e.  RR  /\  y  e.  ( 0 (,) 1 ) )  ->  ( 1  / 
y )  e.  CC )
4636, 38, 45addrsub 8697 . . . . . . . 8  |-  ( ( x  e.  RR  /\  y  e.  ( 0 (,) 1 ) )  ->  ( ( 1  +  ( exp `  x
) )  =  ( 1  /  y )  <-> 
( exp `  x
)  =  ( ( 1  /  y )  -  1 ) ) )
4733adantl 277 . . . . . . . . . 10  |-  ( ( x  e.  RR  /\  y  e.  ( 0 (,) 1 ) )  ->  ( ( 1  /  y )  - 
1 )  e.  RR+ )
4847reeflogd 15984 . . . . . . . . 9  |-  ( ( x  e.  RR  /\  y  e.  ( 0 (,) 1 ) )  ->  ( exp `  ( log `  ( ( 1  /  y )  - 
1 ) ) )  =  ( ( 1  /  y )  - 
1 ) )
4948eqeq2d 2250 . . . . . . . 8  |-  ( ( x  e.  RR  /\  y  e.  ( 0 (,) 1 ) )  ->  ( ( exp `  x )  =  ( exp `  ( log `  ( ( 1  / 
y )  -  1 ) ) )  <->  ( exp `  x )  =  ( ( 1  /  y
)  -  1 ) ) )
50 reef11 12466 . . . . . . . . 9  |-  ( ( x  e.  RR  /\  ( log `  ( ( 1  /  y )  -  1 ) )  e.  RR )  -> 
( ( exp `  x
)  =  ( exp `  ( log `  (
( 1  /  y
)  -  1 ) ) )  <->  x  =  ( log `  ( ( 1  /  y )  -  1 ) ) ) )
5134, 50sylan2 286 . . . . . . . 8  |-  ( ( x  e.  RR  /\  y  e.  ( 0 (,) 1 ) )  ->  ( ( exp `  x )  =  ( exp `  ( log `  ( ( 1  / 
y )  -  1 ) ) )  <->  x  =  ( log `  ( ( 1  /  y )  -  1 ) ) ) )
5246, 49, 513bitr2rd 217 . . . . . . 7  |-  ( ( x  e.  RR  /\  y  e.  ( 0 (,) 1 ) )  ->  ( x  =  ( log `  (
( 1  /  y
)  -  1 ) )  <->  ( 1  +  ( exp `  x
) )  =  ( 1  /  y ) ) )
53 eqcom 2240 . . . . . . 7  |-  ( ( 1  +  ( exp `  x ) )  =  ( 1  /  y
)  <->  ( 1  / 
y )  =  ( 1  +  ( exp `  x ) ) )
5452, 53bitrdi 196 . . . . . 6  |-  ( ( x  e.  RR  /\  y  e.  ( 0 (,) 1 ) )  ->  ( x  =  ( log `  (
( 1  /  y
)  -  1 ) )  <->  ( 1  / 
y )  =  ( 1  +  ( exp `  x ) ) ) )
555adantr 276 . . . . . . . 8  |-  ( ( x  e.  RR  /\  y  e.  ( 0 (,) 1 ) )  ->  ( 1  +  ( exp `  x
) )  e.  RR+ )
5655rpap0d 10103 . . . . . . 7  |-  ( ( x  e.  RR  /\  y  e.  ( 0 (,) 1 ) )  ->  ( 1  +  ( exp `  x
) ) #  0 )
5736, 41, 39, 56divmulap3d 9155 . . . . . 6  |-  ( ( x  e.  RR  /\  y  e.  ( 0 (,) 1 ) )  ->  ( ( 1  /  ( 1  +  ( exp `  x
) ) )  =  y  <->  1  =  ( y  x.  ( 1  +  ( exp `  x
) ) ) ) )
5843, 54, 573bitr4d 220 . . . . 5  |-  ( ( x  e.  RR  /\  y  e.  ( 0 (,) 1 ) )  ->  ( x  =  ( log `  (
( 1  /  y
)  -  1 ) )  <->  ( 1  / 
( 1  +  ( exp `  x ) ) )  =  y ) )
59 eqcom 2240 . . . . 5  |-  ( ( 1  /  ( 1  +  ( exp `  x
) ) )  =  y  <->  y  =  ( 1  /  ( 1  +  ( exp `  x
) ) ) )
6058, 59bitrdi 196 . . . 4  |-  ( ( x  e.  RR  /\  y  e.  ( 0 (,) 1 ) )  ->  ( x  =  ( log `  (
( 1  /  y
)  -  1 ) )  <->  y  =  ( 1  /  ( 1  +  ( exp `  x
) ) ) ) )
6160adantl 277 . . 3  |-  ( ( T.  /\  ( x  e.  RR  /\  y  e.  ( 0 (,) 1
) ) )  -> 
( x  =  ( log `  ( ( 1  /  y )  -  1 ) )  <-> 
y  =  ( 1  /  ( 1  +  ( exp `  x
) ) ) ) )
621, 19, 35, 61f1o2d 6295 . 2  |-  ( T. 
->  F : RR -1-1-onto-> ( 0 (,) 1
) )
6362mptru 1411 1  |-  F : RR
-1-1-onto-> ( 0 (,) 1
)
Colors of variables:    wff set class
This proof depends on syntax axioms:    /\ wa 104    <-> wb 105    /\ w3a 1009    = wceq 1402   T. wtru 1403    e. wcel 2209   class class class wbr 4130    |-> cmpt 4192   -1-1-onto->wf1o 5376   ` cfv 5377  (class class class)co 6085   RRcr 8178   0cc0 8179   1c1 8180    + caddc 8182    x. cmul 8184   RR*cxr 8359    < clt 8360    - cmin 8497    / cdiv 9002   RR+crp 10054   (,)cioo 10290   expce 12409   logclog 15957
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 623  ax-in2 624  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-coll 4246  ax-sep 4249  ax-nul 4259  ax-pow 4311  ax-pr 4346  ax-un 4578  ax-setind 4684  ax-iinf 4735  ax-cnex 8270  ax-resscn 8271  ax-1cn 8272  ax-1re 8273  ax-icn 8274  ax-addcl 8275  ax-addrcl 8276  ax-mulcl 8277  ax-mulrcl 8278  ax-addcom 8279  ax-mulcom 8280  ax-addass 8281  ax-mulass 8282  ax-distr 8283  ax-i2m1 8284  ax-0lt1 8285  ax-1rid 8286  ax-0id 8287  ax-rnegex 8288  ax-precex 8289  ax-cnre 8290  ax-pre-ltirr 8291  ax-pre-ltwlin 8292  ax-pre-lttrn 8293  ax-pre-apti 8294  ax-pre-ltadd 8295  ax-pre-mulgt0 8296  ax-pre-mulext 8297  ax-arch 8298  ax-caucvg 8299  ax-pre-suploc 8300  ax-addf 8301  ax-mulf 8302
This proof depends on definitions:  df-bi 117  df-stab 843  df-dc 847  df-3or 1010  df-3an 1011  df-tru 1405  df-fal 1408  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ne 2421  df-nel 2516  df-ral 2533  df-rex 2534  df-reu 2535  df-rmo 2536  df-rab 2537  df-v 2823  df-sbc 3052  df-csb 3148  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-nul 3521  df-if 3639  df-pw 3690  df-sn 3715  df-pr 3716  df-op 3718  df-uni 3936  df-int 3971  df-iun 4014  df-disj 4107  df-br 4131  df-opab 4193  df-mpt 4194  df-tr 4230  df-id 4438  df-po 4441  df-iso 4442  df-iord 4511  df-on 4513  df-ilim 4514  df-suc 4516  df-iom 4738  df-xp 4780  df-rel 4781  df-cnv 4782  df-co 4783  df-dm 4784  df-rn 4785  df-res 4786  df-ima 4787  df-iota 5337  df-fun 5379  df-fn 5380  df-f 5381  df-f1 5382  df-fo 5383  df-f1o 5384  df-fv 5385  df-isom 5386  df-riota 6038  df-ov 6088  df-oprab 6089  df-mpo 6090  df-of 6302  df-1st 6374  df-2nd 6375  df-recs 6576  df-irdg 6641  df-frec 6662  df-1o 6687  df-oadd 6691  df-er 6807  df-map 6924  df-pm 6925  df-en 7023  df-dom 7024  df-fin 7025  df-sup 7324  df-inf 7325  df-pnf 8362  df-mnf 8363  df-xr 8364  df-ltxr 8365  df-le 8366  df-sub 8499  df-neg 8500  df-reap 8903  df-ap 8910  df-div 9003  df-inn 9305  df-2 9363  df-3 9364  df-4 9365  df-n0 9564  df-z 9645  df-uz 9922  df-q 10020  df-rp 10055  df-xneg 10174  df-xadd 10175  df-ioo 10294  df-ico 10296  df-icc 10297  df-fz 10412  df-fzo 10550  df-seqfrec 10885  df-exp 10976  df-fac 11164  df-bc 11186  df-ihash 11215  df-shft 11580  df-cj 11607  df-re 11608  df-im 11609  df-rsqrt 11764  df-abs 11765  df-clim 12045  df-sumdc 12120  df-ef 12415  df-e 12416  df-rest 13595  df-topgen 13614  df-psmet 14880  df-xmet 14881  df-met 14882  df-bl 14883  df-mopn 14884  df-top 15099  df-topon 15112  df-bases 15144  df-ntr 15197  df-cn 15289  df-cnp 15290  df-tx 15354  df-cncf 15672  df-limced 15757  df-dvap 15758  df-relog 15959
This theorem is used by:  iooreen  17084
  Copyright terms: Public domain W3C validator