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Theorem ismbf2d 19012
Description: Deduction to prove measurability of a real function. (Contributed by Mario Carneiro, 18-Jun-2014.)
Hypotheses
Ref Expression
ismbf2d.1  |-  ( ph  ->  F : A --> RR )
ismbf2d.2  |-  ( ph  ->  A  e.  dom  vol )
ismbf2d.3  |-  ( (
ph  /\  x  e.  RR )  ->  ( `' F " ( x (,)  +oo ) )  e. 
dom  vol )
ismbf2d.4  |-  ( (
ph  /\  x  e.  RR )  ->  ( `' F " (  -oo (,) x ) )  e. 
dom  vol )
Assertion
Ref Expression
ismbf2d  |-  ( ph  ->  F  e. MblFn )
Distinct variable groups:    x, F    ph, x
Allowed substitution hint:    A( x)

Proof of Theorem ismbf2d
StepHypRef Expression
1 ismbf2d.1 . 2  |-  ( ph  ->  F : A --> RR )
2 elxr 10474 . . 3  |-  ( x  e.  RR*  <->  ( x  e.  RR  \/  x  = 
+oo  \/  x  =  -oo ) )
3 ismbf2d.3 . . . 4  |-  ( (
ph  /\  x  e.  RR )  ->  ( `' F " ( x (,)  +oo ) )  e. 
dom  vol )
4 oveq1 5881 . . . . . . . 8  |-  ( x  =  +oo  ->  (
x (,)  +oo )  =  (  +oo (,)  +oo ) )
5 iooid 10700 . . . . . . . 8  |-  (  +oo (,) 
+oo )  =  (/)
64, 5syl6eq 2344 . . . . . . 7  |-  ( x  =  +oo  ->  (
x (,)  +oo )  =  (/) )
76imaeq2d 5028 . . . . . 6  |-  ( x  =  +oo  ->  ( `' F " ( x (,)  +oo ) )  =  ( `' F " (/) ) )
8 ima0 5046 . . . . . . 7  |-  ( `' F " (/) )  =  (/)
9 0mbl 18913 . . . . . . 7  |-  (/)  e.  dom  vol
108, 9eqeltri 2366 . . . . . 6  |-  ( `' F " (/) )  e. 
dom  vol
117, 10syl6eqel 2384 . . . . 5  |-  ( x  =  +oo  ->  ( `' F " ( x (,)  +oo ) )  e. 
dom  vol )
1211adantl 452 . . . 4  |-  ( (
ph  /\  x  =  +oo )  ->  ( `' F " ( x (,)  +oo ) )  e. 
dom  vol )
13 fimacnv 5673 . . . . . . . 8  |-  ( F : A --> RR  ->  ( `' F " RR )  =  A )
141, 13syl 15 . . . . . . 7  |-  ( ph  ->  ( `' F " RR )  =  A
)
15 ismbf2d.2 . . . . . . 7  |-  ( ph  ->  A  e.  dom  vol )
1614, 15eqeltrd 2370 . . . . . 6  |-  ( ph  ->  ( `' F " RR )  e.  dom  vol )
17 oveq1 5881 . . . . . . . . 9  |-  ( x  =  -oo  ->  (
x (,)  +oo )  =  (  -oo (,)  +oo ) )
18 ioomax 10740 . . . . . . . . 9  |-  (  -oo (,) 
+oo )  =  RR
1917, 18syl6eq 2344 . . . . . . . 8  |-  ( x  =  -oo  ->  (
x (,)  +oo )  =  RR )
2019imaeq2d 5028 . . . . . . 7  |-  ( x  =  -oo  ->  ( `' F " ( x (,)  +oo ) )  =  ( `' F " RR ) )
2120eleq1d 2362 . . . . . 6  |-  ( x  =  -oo  ->  (
( `' F "
( x (,)  +oo ) )  e.  dom  vol  <->  ( `' F " RR )  e.  dom  vol )
)
2216, 21syl5ibrcom 213 . . . . 5  |-  ( ph  ->  ( x  =  -oo  ->  ( `' F "
( x (,)  +oo ) )  e.  dom  vol ) )
2322imp 418 . . . 4  |-  ( (
ph  /\  x  =  -oo )  ->  ( `' F " ( x (,)  +oo ) )  e. 
dom  vol )
243, 12, 233jaodan 1248 . . 3  |-  ( (
ph  /\  ( x  e.  RR  \/  x  = 
+oo  \/  x  =  -oo ) )  ->  ( `' F " ( x (,)  +oo ) )  e. 
dom  vol )
252, 24sylan2b 461 . 2  |-  ( (
ph  /\  x  e.  RR* )  ->  ( `' F " ( x (,) 
+oo ) )  e. 
dom  vol )
26 ismbf2d.4 . . . 4  |-  ( (
ph  /\  x  e.  RR )  ->  ( `' F " (  -oo (,) x ) )  e. 
dom  vol )
27 oveq2 5882 . . . . . . . . 9  |-  ( x  =  +oo  ->  (  -oo (,) x )  =  (  -oo (,)  +oo ) )
2827, 18syl6eq 2344 . . . . . . . 8  |-  ( x  =  +oo  ->  (  -oo (,) x )  =  RR )
2928imaeq2d 5028 . . . . . . 7  |-  ( x  =  +oo  ->  ( `' F " (  -oo (,) x ) )  =  ( `' F " RR ) )
3029eleq1d 2362 . . . . . 6  |-  ( x  =  +oo  ->  (
( `' F "
(  -oo (,) x ) )  e.  dom  vol  <->  ( `' F " RR )  e.  dom  vol )
)
3116, 30syl5ibrcom 213 . . . . 5  |-  ( ph  ->  ( x  =  +oo  ->  ( `' F "
(  -oo (,) x ) )  e.  dom  vol ) )
3231imp 418 . . . 4  |-  ( (
ph  /\  x  =  +oo )  ->  ( `' F " (  -oo (,) x ) )  e. 
dom  vol )
33 oveq2 5882 . . . . . . . 8  |-  ( x  =  -oo  ->  (  -oo (,) x )  =  (  -oo (,)  -oo ) )
34 iooid 10700 . . . . . . . 8  |-  (  -oo (,) 
-oo )  =  (/)
3533, 34syl6eq 2344 . . . . . . 7  |-  ( x  =  -oo  ->  (  -oo (,) x )  =  (/) )
3635imaeq2d 5028 . . . . . 6  |-  ( x  =  -oo  ->  ( `' F " (  -oo (,) x ) )  =  ( `' F " (/) ) )
3736, 10syl6eqel 2384 . . . . 5  |-  ( x  =  -oo  ->  ( `' F " (  -oo (,) x ) )  e. 
dom  vol )
3837adantl 452 . . . 4  |-  ( (
ph  /\  x  =  -oo )  ->  ( `' F " (  -oo (,) x ) )  e. 
dom  vol )
3926, 32, 383jaodan 1248 . . 3  |-  ( (
ph  /\  ( x  e.  RR  \/  x  = 
+oo  \/  x  =  -oo ) )  ->  ( `' F " (  -oo (,) x ) )  e. 
dom  vol )
402, 39sylan2b 461 . 2  |-  ( (
ph  /\  x  e.  RR* )  ->  ( `' F " (  -oo (,) x ) )  e. 
dom  vol )
411, 25, 40ismbfd 19011 1  |-  ( ph  ->  F  e. MblFn )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 358    \/ w3o 933    = wceq 1632    e. wcel 1696   (/)c0 3468   `'ccnv 4704   dom cdm 4705   "cima 4708   -->wf 5267  (class class class)co 5874   RRcr 8752    +oocpnf 8880    -oocmnf 8881   RR*cxr 8882   (,)cioo 10672   volcvol 18839  MblFncmbf 18985
This theorem is referenced by:  mbfres  19015  mbfmulc2lem  19018  mbfposr  19023  ismbf3d  19025  iblabsnclem  25014
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1536  ax-5 1547  ax-17 1606  ax-9 1644  ax-8 1661  ax-13 1698  ax-14 1700  ax-6 1715  ax-7 1720  ax-11 1727  ax-12 1878  ax-ext 2277  ax-rep 4147  ax-sep 4157  ax-nul 4165  ax-pow 4204  ax-pr 4230  ax-un 4528  ax-inf2 7358  ax-cnex 8809  ax-resscn 8810  ax-1cn 8811  ax-icn 8812  ax-addcl 8813  ax-addrcl 8814  ax-mulcl 8815  ax-mulrcl 8816  ax-mulcom 8817  ax-addass 8818  ax-mulass 8819  ax-distr 8820  ax-i2m1 8821  ax-1ne0 8822  ax-1rid 8823  ax-rnegex 8824  ax-rrecex 8825  ax-cnre 8826  ax-pre-lttri 8827  ax-pre-lttrn 8828  ax-pre-ltadd 8829  ax-pre-mulgt0 8830  ax-pre-sup 8831
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3or 935  df-3an 936  df-tru 1310  df-ex 1532  df-nf 1535  df-sb 1639  df-eu 2160  df-mo 2161  df-clab 2283  df-cleq 2289  df-clel 2292  df-nfc 2421  df-ne 2461  df-nel 2462  df-ral 2561  df-rex 2562  df-reu 2563  df-rmo 2564  df-rab 2565  df-v 2803  df-sbc 3005  df-csb 3095  df-dif 3168  df-un 3170  df-in 3172  df-ss 3179  df-pss 3181  df-nul 3469  df-if 3579  df-pw 3640  df-sn 3659  df-pr 3660  df-tp 3661  df-op 3662  df-uni 3844  df-int 3879  df-iun 3923  df-br 4040  df-opab 4094  df-mpt 4095  df-tr 4130  df-eprel 4321  df-id 4325  df-po 4330  df-so 4331  df-fr 4368  df-se 4369  df-we 4370  df-ord 4411  df-on 4412  df-lim 4413  df-suc 4414  df-om 4673  df-xp 4711  df-rel 4712  df-cnv 4713  df-co 4714  df-dm 4715  df-rn 4716  df-res 4717  df-ima 4718  df-iota 5235  df-fun 5273  df-fn 5274  df-f 5275  df-f1 5276  df-fo 5277  df-f1o 5278  df-fv 5279  df-isom 5280  df-ov 5877  df-oprab 5878  df-mpt2 5879  df-of 6094  df-1st 6138  df-2nd 6139  df-riota 6320  df-recs 6404  df-rdg 6439  df-1o 6495  df-2o 6496  df-oadd 6499  df-er 6676  df-map 6790  df-pm 6791  df-en 6880  df-dom 6881  df-sdom 6882  df-fin 6883  df-sup 7210  df-oi 7241  df-card 7588  df-cda 7810  df-pnf 8885  df-mnf 8886  df-xr 8887  df-ltxr 8888  df-le 8889  df-sub 9055  df-neg 9056  df-div 9440  df-nn 9763  df-2 9820  df-3 9821  df-n0 9982  df-z 10041  df-uz 10247  df-q 10333  df-rp 10371  df-xadd 10469  df-ioo 10676  df-ico 10678  df-icc 10679  df-fz 10799  df-fzo 10887  df-fl 10941  df-seq 11063  df-exp 11121  df-hash 11354  df-cj 11600  df-re 11601  df-im 11602  df-sqr 11736  df-abs 11737  df-clim 11978  df-sum 12175  df-xmet 16389  df-met 16390  df-ovol 18840  df-vol 18841  df-mbf 18991
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