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Theorem metnrmlem1a 18362
Description: Lemma for metnrm 18366. (Contributed by Mario Carneiro, 14-Jan-2014.) (Revised by Mario Carneiro, 4-Sep-2015.)
Hypotheses
Ref Expression
metdscn.f  |-  F  =  ( x  e.  X  |->  sup ( ran  (
y  e.  S  |->  ( x D y ) ) ,  RR* ,  `'  <  ) )
metdscn.j  |-  J  =  ( MetOpen `  D )
metnrmlem.1  |-  ( ph  ->  D  e.  ( * Met `  X ) )
metnrmlem.2  |-  ( ph  ->  S  e.  ( Clsd `  J ) )
metnrmlem.3  |-  ( ph  ->  T  e.  ( Clsd `  J ) )
metnrmlem.4  |-  ( ph  ->  ( S  i^i  T
)  =  (/) )
Assertion
Ref Expression
metnrmlem1a  |-  ( (
ph  /\  A  e.  T )  ->  (
0  <  ( F `  A )  /\  if ( 1  <_  ( F `  A ) ,  1 ,  ( F `  A ) )  e.  RR+ )
)
Distinct variable groups:    x, y, A    x, D, y    y, J    x, T, y    x, S, y    x, X, y
Allowed substitution hints:    ph( x, y)    F( x, y)    J( x)

Proof of Theorem metnrmlem1a
StepHypRef Expression
1 metnrmlem.4 . . . . . 6  |-  ( ph  ->  ( S  i^i  T
)  =  (/) )
21adantr 451 . . . . 5  |-  ( (
ph  /\  A  e.  T )  ->  ( S  i^i  T )  =  (/) )
3 inelcm 3509 . . . . . . . 8  |-  ( ( A  e.  S  /\  A  e.  T )  ->  ( S  i^i  T
)  =/=  (/) )
43expcom 424 . . . . . . 7  |-  ( A  e.  T  ->  ( A  e.  S  ->  ( S  i^i  T )  =/=  (/) ) )
54adantl 452 . . . . . 6  |-  ( (
ph  /\  A  e.  T )  ->  ( A  e.  S  ->  ( S  i^i  T )  =/=  (/) ) )
65necon2bd 2495 . . . . 5  |-  ( (
ph  /\  A  e.  T )  ->  (
( S  i^i  T
)  =  (/)  ->  -.  A  e.  S )
)
72, 6mpd 14 . . . 4  |-  ( (
ph  /\  A  e.  T )  ->  -.  A  e.  S )
8 eqcom 2285 . . . . . 6  |-  ( 0  =  ( F `  A )  <->  ( F `  A )  =  0 )
9 metnrmlem.1 . . . . . . . 8  |-  ( ph  ->  D  e.  ( * Met `  X ) )
109adantr 451 . . . . . . 7  |-  ( (
ph  /\  A  e.  T )  ->  D  e.  ( * Met `  X
) )
11 metnrmlem.2 . . . . . . . . . 10  |-  ( ph  ->  S  e.  ( Clsd `  J ) )
1211adantr 451 . . . . . . . . 9  |-  ( (
ph  /\  A  e.  T )  ->  S  e.  ( Clsd `  J
) )
13 eqid 2283 . . . . . . . . . 10  |-  U. J  =  U. J
1413cldss 16766 . . . . . . . . 9  |-  ( S  e.  ( Clsd `  J
)  ->  S  C_  U. J
)
1512, 14syl 15 . . . . . . . 8  |-  ( (
ph  /\  A  e.  T )  ->  S  C_ 
U. J )
16 metdscn.j . . . . . . . . . 10  |-  J  =  ( MetOpen `  D )
1716mopnuni 17987 . . . . . . . . 9  |-  ( D  e.  ( * Met `  X )  ->  X  =  U. J )
1810, 17syl 15 . . . . . . . 8  |-  ( (
ph  /\  A  e.  T )  ->  X  =  U. J )
1915, 18sseqtr4d 3215 . . . . . . 7  |-  ( (
ph  /\  A  e.  T )  ->  S  C_  X )
20 metnrmlem.3 . . . . . . . . . . 11  |-  ( ph  ->  T  e.  ( Clsd `  J ) )
2120adantr 451 . . . . . . . . . 10  |-  ( (
ph  /\  A  e.  T )  ->  T  e.  ( Clsd `  J
) )
2213cldss 16766 . . . . . . . . . 10  |-  ( T  e.  ( Clsd `  J
)  ->  T  C_  U. J
)
2321, 22syl 15 . . . . . . . . 9  |-  ( (
ph  /\  A  e.  T )  ->  T  C_ 
U. J )
2423, 18sseqtr4d 3215 . . . . . . . 8  |-  ( (
ph  /\  A  e.  T )  ->  T  C_  X )
25 simpr 447 . . . . . . . 8  |-  ( (
ph  /\  A  e.  T )  ->  A  e.  T )
2624, 25sseldd 3181 . . . . . . 7  |-  ( (
ph  /\  A  e.  T )  ->  A  e.  X )
27 metdscn.f . . . . . . . 8  |-  F  =  ( x  e.  X  |->  sup ( ran  (
y  e.  S  |->  ( x D y ) ) ,  RR* ,  `'  <  ) )
2827, 16metdseq0 18358 . . . . . . 7  |-  ( ( D  e.  ( * Met `  X )  /\  S  C_  X  /\  A  e.  X
)  ->  ( ( F `  A )  =  0  <->  A  e.  ( ( cls `  J
) `  S )
) )
2910, 19, 26, 28syl3anc 1182 . . . . . 6  |-  ( (
ph  /\  A  e.  T )  ->  (
( F `  A
)  =  0  <->  A  e.  ( ( cls `  J
) `  S )
) )
308, 29syl5bb 248 . . . . 5  |-  ( (
ph  /\  A  e.  T )  ->  (
0  =  ( F `
 A )  <->  A  e.  ( ( cls `  J
) `  S )
) )
31 cldcls 16779 . . . . . . 7  |-  ( S  e.  ( Clsd `  J
)  ->  ( ( cls `  J ) `  S )  =  S )
3212, 31syl 15 . . . . . 6  |-  ( (
ph  /\  A  e.  T )  ->  (
( cls `  J
) `  S )  =  S )
3332eleq2d 2350 . . . . 5  |-  ( (
ph  /\  A  e.  T )  ->  ( A  e.  ( ( cls `  J ) `  S )  <->  A  e.  S ) )
3430, 33bitrd 244 . . . 4  |-  ( (
ph  /\  A  e.  T )  ->  (
0  =  ( F `
 A )  <->  A  e.  S ) )
357, 34mtbird 292 . . 3  |-  ( (
ph  /\  A  e.  T )  ->  -.  0  =  ( F `  A ) )
3627metdsf 18352 . . . . . . . 8  |-  ( ( D  e.  ( * Met `  X )  /\  S  C_  X
)  ->  F : X
--> ( 0 [,]  +oo ) )
3710, 19, 36syl2anc 642 . . . . . . 7  |-  ( (
ph  /\  A  e.  T )  ->  F : X --> ( 0 [,] 
+oo ) )
38 ffvelrn 5663 . . . . . . 7  |-  ( ( F : X --> ( 0 [,]  +oo )  /\  A  e.  X )  ->  ( F `  A )  e.  ( 0 [,]  +oo ) )
3937, 26, 38syl2anc 642 . . . . . 6  |-  ( (
ph  /\  A  e.  T )  ->  ( F `  A )  e.  ( 0 [,]  +oo ) )
40 elxrge0 10747 . . . . . . 7  |-  ( ( F `  A )  e.  ( 0 [,] 
+oo )  <->  ( ( F `  A )  e.  RR*  /\  0  <_ 
( F `  A
) ) )
4140simprbi 450 . . . . . 6  |-  ( ( F `  A )  e.  ( 0 [,] 
+oo )  ->  0  <_  ( F `  A
) )
4239, 41syl 15 . . . . 5  |-  ( (
ph  /\  A  e.  T )  ->  0  <_  ( F `  A
) )
43 0xr 8878 . . . . . 6  |-  0  e.  RR*
4440simplbi 446 . . . . . . 7  |-  ( ( F `  A )  e.  ( 0 [,] 
+oo )  ->  ( F `  A )  e.  RR* )
4539, 44syl 15 . . . . . 6  |-  ( (
ph  /\  A  e.  T )  ->  ( F `  A )  e.  RR* )
46 xrleloe 10478 . . . . . 6  |-  ( ( 0  e.  RR*  /\  ( F `  A )  e.  RR* )  ->  (
0  <_  ( F `  A )  <->  ( 0  <  ( F `  A )  \/  0  =  ( F `  A ) ) ) )
4743, 45, 46sylancr 644 . . . . 5  |-  ( (
ph  /\  A  e.  T )  ->  (
0  <_  ( F `  A )  <->  ( 0  <  ( F `  A )  \/  0  =  ( F `  A ) ) ) )
4842, 47mpbid 201 . . . 4  |-  ( (
ph  /\  A  e.  T )  ->  (
0  <  ( F `  A )  \/  0  =  ( F `  A ) ) )
4948ord 366 . . 3  |-  ( (
ph  /\  A  e.  T )  ->  ( -.  0  <  ( F `
 A )  -> 
0  =  ( F `
 A ) ) )
5035, 49mt3d 117 . 2  |-  ( (
ph  /\  A  e.  T )  ->  0  <  ( F `  A
) )
51 1re 8837 . . . . . 6  |-  1  e.  RR
52 rexr 8877 . . . . . 6  |-  ( 1  e.  RR  ->  1  e.  RR* )
5351, 52ax-mp 8 . . . . 5  |-  1  e.  RR*
54 ifcl 3601 . . . . 5  |-  ( ( 1  e.  RR*  /\  ( F `  A )  e.  RR* )  ->  if ( 1  <_  ( F `  A ) ,  1 ,  ( F `  A ) )  e.  RR* )
5553, 45, 54sylancr 644 . . . 4  |-  ( (
ph  /\  A  e.  T )  ->  if ( 1  <_  ( F `  A ) ,  1 ,  ( F `  A ) )  e.  RR* )
5651a1i 10 . . . 4  |-  ( (
ph  /\  A  e.  T )  ->  1  e.  RR )
57 0lt1 9296 . . . . . 6  |-  0  <  1
58 breq2 4027 . . . . . . 7  |-  ( 1  =  if ( 1  <_  ( F `  A ) ,  1 ,  ( F `  A ) )  -> 
( 0  <  1  <->  0  <  if ( 1  <_  ( F `  A ) ,  1 ,  ( F `  A ) ) ) )
59 breq2 4027 . . . . . . 7  |-  ( ( F `  A )  =  if ( 1  <_  ( F `  A ) ,  1 ,  ( F `  A ) )  -> 
( 0  <  ( F `  A )  <->  0  <  if ( 1  <_  ( F `  A ) ,  1 ,  ( F `  A ) ) ) )
6058, 59ifboth 3596 . . . . . 6  |-  ( ( 0  <  1  /\  0  <  ( F `
 A ) )  ->  0  <  if ( 1  <_  ( F `  A ) ,  1 ,  ( F `  A ) ) )
6157, 50, 60sylancr 644 . . . . 5  |-  ( (
ph  /\  A  e.  T )  ->  0  <  if ( 1  <_ 
( F `  A
) ,  1 ,  ( F `  A
) ) )
62 xrltle 10483 . . . . . 6  |-  ( ( 0  e.  RR*  /\  if ( 1  <_  ( F `  A ) ,  1 ,  ( F `  A ) )  e.  RR* )  ->  ( 0  <  if ( 1  <_  ( F `  A ) ,  1 ,  ( F `  A ) )  ->  0  <_  if ( 1  <_  ( F `  A ) ,  1 ,  ( F `  A ) ) ) )
6343, 55, 62sylancr 644 . . . . 5  |-  ( (
ph  /\  A  e.  T )  ->  (
0  <  if (
1  <_  ( F `  A ) ,  1 ,  ( F `  A ) )  -> 
0  <_  if (
1  <_  ( F `  A ) ,  1 ,  ( F `  A ) ) ) )
6461, 63mpd 14 . . . 4  |-  ( (
ph  /\  A  e.  T )  ->  0  <_  if ( 1  <_ 
( F `  A
) ,  1 ,  ( F `  A
) ) )
65 xrmin1 10506 . . . . 5  |-  ( ( 1  e.  RR*  /\  ( F `  A )  e.  RR* )  ->  if ( 1  <_  ( F `  A ) ,  1 ,  ( F `  A ) )  <_  1 )
6653, 45, 65sylancr 644 . . . 4  |-  ( (
ph  /\  A  e.  T )  ->  if ( 1  <_  ( F `  A ) ,  1 ,  ( F `  A ) )  <_  1 )
67 xrrege0 10503 . . . 4  |-  ( ( ( if ( 1  <_  ( F `  A ) ,  1 ,  ( F `  A ) )  e. 
RR*  /\  1  e.  RR )  /\  (
0  <_  if (
1  <_  ( F `  A ) ,  1 ,  ( F `  A ) )  /\  if ( 1  <_  ( F `  A ) ,  1 ,  ( F `  A ) )  <_  1 ) )  ->  if (
1  <_  ( F `  A ) ,  1 ,  ( F `  A ) )  e.  RR )
6855, 56, 64, 66, 67syl22anc 1183 . . 3  |-  ( (
ph  /\  A  e.  T )  ->  if ( 1  <_  ( F `  A ) ,  1 ,  ( F `  A ) )  e.  RR )
6968, 61elrpd 10388 . 2  |-  ( (
ph  /\  A  e.  T )  ->  if ( 1  <_  ( F `  A ) ,  1 ,  ( F `  A ) )  e.  RR+ )
7050, 69jca 518 1  |-  ( (
ph  /\  A  e.  T )  ->  (
0  <  ( F `  A )  /\  if ( 1  <_  ( F `  A ) ,  1 ,  ( F `  A ) )  e.  RR+ )
)
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4    <-> wb 176    \/ wo 357    /\ wa 358    = wceq 1623    e. wcel 1684    =/= wne 2446    i^i cin 3151    C_ wss 3152   (/)c0 3455   ifcif 3565   U.cuni 3827   class class class wbr 4023    e. cmpt 4077   `'ccnv 4688   ran crn 4690   -->wf 5251   ` cfv 5255  (class class class)co 5858   supcsup 7193   RRcr 8736   0cc0 8737   1c1 8738    +oocpnf 8864   RR*cxr 8866    < clt 8867    <_ cle 8868   RR+crp 10354   [,]cicc 10659   * Metcxmt 16369   MetOpencmopn 16372   Clsdccld 16753   clsccl 16755
This theorem is referenced by:  metnrmlem2  18364  metnrmlem3  18365
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1533  ax-5 1544  ax-17 1603  ax-9 1635  ax-8 1643  ax-13 1686  ax-14 1688  ax-6 1703  ax-7 1708  ax-11 1715  ax-12 1866  ax-ext 2264  ax-rep 4131  ax-sep 4141  ax-nul 4149  ax-pow 4188  ax-pr 4214  ax-un 4512  ax-cnex 8793  ax-resscn 8794  ax-1cn 8795  ax-icn 8796  ax-addcl 8797  ax-addrcl 8798  ax-mulcl 8799  ax-mulrcl 8800  ax-mulcom 8801  ax-addass 8802  ax-mulass 8803  ax-distr 8804  ax-i2m1 8805  ax-1ne0 8806  ax-1rid 8807  ax-rnegex 8808  ax-rrecex 8809  ax-cnre 8810  ax-pre-lttri 8811  ax-pre-lttrn 8812  ax-pre-ltadd 8813  ax-pre-mulgt0 8814  ax-pre-sup 8815
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 1529  df-nf 1532  df-sb 1630  df-eu 2147  df-mo 2148  df-clab 2270  df-cleq 2276  df-clel 2279  df-nfc 2408  df-ne 2448  df-nel 2449  df-ral 2548  df-rex 2549  df-reu 2550  df-rmo 2551  df-rab 2552  df-v 2790  df-sbc 2992  df-csb 3082  df-dif 3155  df-un 3157  df-in 3159  df-ss 3166  df-pss 3168  df-nul 3456  df-if 3566  df-pw 3627  df-sn 3646  df-pr 3647  df-tp 3648  df-op 3649  df-uni 3828  df-int 3863  df-iun 3907  df-iin 3908  df-br 4024  df-opab 4078  df-mpt 4079  df-tr 4114  df-eprel 4305  df-id 4309  df-po 4314  df-so 4315  df-fr 4352  df-we 4354  df-ord 4395  df-on 4396  df-lim 4397  df-suc 4398  df-om 4657  df-xp 4695  df-rel 4696  df-cnv 4697  df-co 4698  df-dm 4699  df-rn 4700  df-res 4701  df-ima 4702  df-iota 5219  df-fun 5257  df-fn 5258  df-f 5259  df-f1 5260  df-fo 5261  df-f1o 5262  df-fv 5263  df-ov 5861  df-oprab 5862  df-mpt2 5863  df-1st 6122  df-2nd 6123  df-riota 6304  df-recs 6388  df-rdg 6423  df-er 6660  df-map 6774  df-en 6864  df-dom 6865  df-sdom 6866  df-sup 7194  df-pnf 8869  df-mnf 8870  df-xr 8871  df-ltxr 8872  df-le 8873  df-sub 9039  df-neg 9040  df-div 9424  df-nn 9747  df-2 9804  df-n0 9966  df-z 10025  df-uz 10231  df-q 10317  df-rp 10355  df-xneg 10452  df-xadd 10453  df-xmul 10454  df-icc 10663  df-topgen 13344  df-xmet 16373  df-bl 16375  df-mopn 16376  df-top 16636  df-bases 16638  df-topon 16639  df-cld 16756  df-ntr 16757  df-cls 16758
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