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Theorem metcnp2 18577
Description: Two ways to say a mapping from metric  C to metric  D is continuous at point  P. The distance arguments are swapped compared to metcnp 18576 (and Munkres' metcn 18578) for compatibility with df-lm 17298. Definition 1.3-3 of [Kreyszig] p. 20. (Contributed by NM, 4-Jun-2007.) (Revised by Mario Carneiro, 13-Nov-2013.)
Hypotheses
Ref Expression
metcn.2  |-  J  =  ( MetOpen `  C )
metcn.4  |-  K  =  ( MetOpen `  D )
Assertion
Ref Expression
metcnp2  |-  ( ( C  e.  ( * Met `  X )  /\  D  e.  ( * Met `  Y
)  /\  P  e.  X )  ->  ( F  e.  ( ( J  CnP  K ) `  P )  <->  ( F : X --> Y  /\  A. y  e.  RR+  E. z  e.  RR+  A. w  e.  X  ( ( w C P )  < 
z  ->  ( ( F `  w ) D ( F `  P ) )  < 
y ) ) ) )
Distinct variable groups:    y, w, z, F    w, J, y, z    w, K, y, z    w, X, y, z    w, Y, y, z    w, C, y, z    w, D, y, z    w, P, y, z

Proof of Theorem metcnp2
StepHypRef Expression
1 metcn.2 . . 3  |-  J  =  ( MetOpen `  C )
2 metcn.4 . . 3  |-  K  =  ( MetOpen `  D )
31, 2metcnp 18576 . 2  |-  ( ( C  e.  ( * Met `  X )  /\  D  e.  ( * Met `  Y
)  /\  P  e.  X )  ->  ( F  e.  ( ( J  CnP  K ) `  P )  <->  ( F : X --> Y  /\  A. y  e.  RR+  E. z  e.  RR+  A. w  e.  X  ( ( P C w )  < 
z  ->  ( ( F `  P ) D ( F `  w ) )  < 
y ) ) ) )
4 simpl1 961 . . . . . . . . . . 11  |-  ( ( ( C  e.  ( * Met `  X
)  /\  D  e.  ( * Met `  Y
)  /\  P  e.  X )  /\  F : X --> Y )  ->  C  e.  ( * Met `  X ) )
54ad2antrr 708 . . . . . . . . . 10  |-  ( ( ( ( ( C  e.  ( * Met `  X )  /\  D  e.  ( * Met `  Y
)  /\  P  e.  X )  /\  F : X --> Y )  /\  ( y  e.  RR+  /\  z  e.  RR+ )
)  /\  w  e.  X )  ->  C  e.  ( * Met `  X
) )
6 simpl3 963 . . . . . . . . . . 11  |-  ( ( ( C  e.  ( * Met `  X
)  /\  D  e.  ( * Met `  Y
)  /\  P  e.  X )  /\  F : X --> Y )  ->  P  e.  X )
76ad2antrr 708 . . . . . . . . . 10  |-  ( ( ( ( ( C  e.  ( * Met `  X )  /\  D  e.  ( * Met `  Y
)  /\  P  e.  X )  /\  F : X --> Y )  /\  ( y  e.  RR+  /\  z  e.  RR+ )
)  /\  w  e.  X )  ->  P  e.  X )
8 simpr 449 . . . . . . . . . 10  |-  ( ( ( ( ( C  e.  ( * Met `  X )  /\  D  e.  ( * Met `  Y
)  /\  P  e.  X )  /\  F : X --> Y )  /\  ( y  e.  RR+  /\  z  e.  RR+ )
)  /\  w  e.  X )  ->  w  e.  X )
9 xmetsym 18382 . . . . . . . . . 10  |-  ( ( C  e.  ( * Met `  X )  /\  P  e.  X  /\  w  e.  X
)  ->  ( P C w )  =  ( w C P ) )
105, 7, 8, 9syl3anc 1185 . . . . . . . . 9  |-  ( ( ( ( ( C  e.  ( * Met `  X )  /\  D  e.  ( * Met `  Y
)  /\  P  e.  X )  /\  F : X --> Y )  /\  ( y  e.  RR+  /\  z  e.  RR+ )
)  /\  w  e.  X )  ->  ( P C w )  =  ( w C P ) )
1110breq1d 4225 . . . . . . . 8  |-  ( ( ( ( ( C  e.  ( * Met `  X )  /\  D  e.  ( * Met `  Y
)  /\  P  e.  X )  /\  F : X --> Y )  /\  ( y  e.  RR+  /\  z  e.  RR+ )
)  /\  w  e.  X )  ->  (
( P C w )  <  z  <->  ( w C P )  <  z
) )
12 simpl2 962 . . . . . . . . . . 11  |-  ( ( ( C  e.  ( * Met `  X
)  /\  D  e.  ( * Met `  Y
)  /\  P  e.  X )  /\  F : X --> Y )  ->  D  e.  ( * Met `  Y ) )
1312ad2antrr 708 . . . . . . . . . 10  |-  ( ( ( ( ( C  e.  ( * Met `  X )  /\  D  e.  ( * Met `  Y
)  /\  P  e.  X )  /\  F : X --> Y )  /\  ( y  e.  RR+  /\  z  e.  RR+ )
)  /\  w  e.  X )  ->  D  e.  ( * Met `  Y
) )
14 simpllr 737 . . . . . . . . . . 11  |-  ( ( ( ( ( C  e.  ( * Met `  X )  /\  D  e.  ( * Met `  Y
)  /\  P  e.  X )  /\  F : X --> Y )  /\  ( y  e.  RR+  /\  z  e.  RR+ )
)  /\  w  e.  X )  ->  F : X --> Y )
1514, 7ffvelrnd 5874 . . . . . . . . . 10  |-  ( ( ( ( ( C  e.  ( * Met `  X )  /\  D  e.  ( * Met `  Y
)  /\  P  e.  X )  /\  F : X --> Y )  /\  ( y  e.  RR+  /\  z  e.  RR+ )
)  /\  w  e.  X )  ->  ( F `  P )  e.  Y )
1614, 8ffvelrnd 5874 . . . . . . . . . 10  |-  ( ( ( ( ( C  e.  ( * Met `  X )  /\  D  e.  ( * Met `  Y
)  /\  P  e.  X )  /\  F : X --> Y )  /\  ( y  e.  RR+  /\  z  e.  RR+ )
)  /\  w  e.  X )  ->  ( F `  w )  e.  Y )
17 xmetsym 18382 . . . . . . . . . 10  |-  ( ( D  e.  ( * Met `  Y )  /\  ( F `  P )  e.  Y  /\  ( F `  w
)  e.  Y )  ->  ( ( F `
 P ) D ( F `  w
) )  =  ( ( F `  w
) D ( F `
 P ) ) )
1813, 15, 16, 17syl3anc 1185 . . . . . . . . 9  |-  ( ( ( ( ( C  e.  ( * Met `  X )  /\  D  e.  ( * Met `  Y
)  /\  P  e.  X )  /\  F : X --> Y )  /\  ( y  e.  RR+  /\  z  e.  RR+ )
)  /\  w  e.  X )  ->  (
( F `  P
) D ( F `
 w ) )  =  ( ( F `
 w ) D ( F `  P
) ) )
1918breq1d 4225 . . . . . . . 8  |-  ( ( ( ( ( C  e.  ( * Met `  X )  /\  D  e.  ( * Met `  Y
)  /\  P  e.  X )  /\  F : X --> Y )  /\  ( y  e.  RR+  /\  z  e.  RR+ )
)  /\  w  e.  X )  ->  (
( ( F `  P ) D ( F `  w ) )  <  y  <->  ( ( F `  w ) D ( F `  P ) )  < 
y ) )
2011, 19imbi12d 313 . . . . . . 7  |-  ( ( ( ( ( C  e.  ( * Met `  X )  /\  D  e.  ( * Met `  Y
)  /\  P  e.  X )  /\  F : X --> Y )  /\  ( y  e.  RR+  /\  z  e.  RR+ )
)  /\  w  e.  X )  ->  (
( ( P C w )  <  z  ->  ( ( F `  P ) D ( F `  w ) )  <  y )  <-> 
( ( w C P )  <  z  ->  ( ( F `  w ) D ( F `  P ) )  <  y ) ) )
2120ralbidva 2723 . . . . . 6  |-  ( ( ( ( C  e.  ( * Met `  X
)  /\  D  e.  ( * Met `  Y
)  /\  P  e.  X )  /\  F : X --> Y )  /\  ( y  e.  RR+  /\  z  e.  RR+ )
)  ->  ( A. w  e.  X  (
( P C w )  <  z  -> 
( ( F `  P ) D ( F `  w ) )  <  y )  <->  A. w  e.  X  ( ( w C P )  <  z  ->  ( ( F `  w ) D ( F `  P ) )  <  y ) ) )
2221anassrs 631 . . . . 5  |-  ( ( ( ( ( C  e.  ( * Met `  X )  /\  D  e.  ( * Met `  Y
)  /\  P  e.  X )  /\  F : X --> Y )  /\  y  e.  RR+ )  /\  z  e.  RR+ )  -> 
( A. w  e.  X  ( ( P C w )  < 
z  ->  ( ( F `  P ) D ( F `  w ) )  < 
y )  <->  A. w  e.  X  ( (
w C P )  <  z  ->  (
( F `  w
) D ( F `
 P ) )  <  y ) ) )
2322rexbidva 2724 . . . 4  |-  ( ( ( ( C  e.  ( * Met `  X
)  /\  D  e.  ( * Met `  Y
)  /\  P  e.  X )  /\  F : X --> Y )  /\  y  e.  RR+ )  -> 
( E. z  e.  RR+  A. w  e.  X  ( ( P C w )  <  z  ->  ( ( F `  P ) D ( F `  w ) )  <  y )  <->  E. z  e.  RR+  A. w  e.  X  ( (
w C P )  <  z  ->  (
( F `  w
) D ( F `
 P ) )  <  y ) ) )
2423ralbidva 2723 . . 3  |-  ( ( ( C  e.  ( * Met `  X
)  /\  D  e.  ( * Met `  Y
)  /\  P  e.  X )  /\  F : X --> Y )  -> 
( A. y  e.  RR+  E. z  e.  RR+  A. w  e.  X  ( ( P C w )  <  z  -> 
( ( F `  P ) D ( F `  w ) )  <  y )  <->  A. y  e.  RR+  E. z  e.  RR+  A. w  e.  X  ( ( w C P )  < 
z  ->  ( ( F `  w ) D ( F `  P ) )  < 
y ) ) )
2524pm5.32da 624 . 2  |-  ( ( C  e.  ( * Met `  X )  /\  D  e.  ( * Met `  Y
)  /\  P  e.  X )  ->  (
( F : X --> Y  /\  A. y  e.  RR+  E. z  e.  RR+  A. w  e.  X  ( ( P C w )  <  z  -> 
( ( F `  P ) D ( F `  w ) )  <  y ) )  <->  ( F : X
--> Y  /\  A. y  e.  RR+  E. z  e.  RR+  A. w  e.  X  ( ( w C P )  <  z  ->  ( ( F `  w ) D ( F `  P ) )  <  y ) ) ) )
263, 25bitrd 246 1  |-  ( ( C  e.  ( * Met `  X )  /\  D  e.  ( * Met `  Y
)  /\  P  e.  X )  ->  ( F  e.  ( ( J  CnP  K ) `  P )  <->  ( F : X --> Y  /\  A. y  e.  RR+  E. z  e.  RR+  A. w  e.  X  ( ( w C P )  < 
z  ->  ( ( F `  w ) D ( F `  P ) )  < 
y ) ) ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    <-> wb 178    /\ wa 360    /\ w3a 937    = wceq 1653    e. wcel 1726   A.wral 2707   E.wrex 2708   class class class wbr 4215   -->wf 5453   ` cfv 5457  (class class class)co 6084    < clt 9125   RR+crp 10617   * Metcxmt 16691   MetOpencmopn 16696    CnP ccnp 17294
This theorem is referenced by:  metcnpi2  18580  rlimcnp  20809
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1556  ax-5 1567  ax-17 1627  ax-9 1667  ax-8 1688  ax-13 1728  ax-14 1730  ax-6 1745  ax-7 1750  ax-11 1762  ax-12 1951  ax-ext 2419  ax-sep 4333  ax-nul 4341  ax-pow 4380  ax-pr 4406  ax-un 4704  ax-cnex 9051  ax-resscn 9052  ax-1cn 9053  ax-icn 9054  ax-addcl 9055  ax-addrcl 9056  ax-mulcl 9057  ax-mulrcl 9058  ax-mulcom 9059  ax-addass 9060  ax-mulass 9061  ax-distr 9062  ax-i2m1 9063  ax-1ne0 9064  ax-1rid 9065  ax-rnegex 9066  ax-rrecex 9067  ax-cnre 9068  ax-pre-lttri 9069  ax-pre-lttrn 9070  ax-pre-ltadd 9071  ax-pre-mulgt0 9072  ax-pre-sup 9073
This theorem depends on definitions:  df-bi 179  df-or 361  df-an 362  df-3or 938  df-3an 939  df-tru 1329  df-ex 1552  df-nf 1555  df-sb 1660  df-eu 2287  df-mo 2288  df-clab 2425  df-cleq 2431  df-clel 2434  df-nfc 2563  df-ne 2603  df-nel 2604  df-ral 2712  df-rex 2713  df-reu 2714  df-rmo 2715  df-rab 2716  df-v 2960  df-sbc 3164  df-csb 3254  df-dif 3325  df-un 3327  df-in 3329  df-ss 3336  df-pss 3338  df-nul 3631  df-if 3742  df-pw 3803  df-sn 3822  df-pr 3823  df-tp 3824  df-op 3825  df-uni 4018  df-iun 4097  df-br 4216  df-opab 4270  df-mpt 4271  df-tr 4306  df-eprel 4497  df-id 4501  df-po 4506  df-so 4507  df-fr 4544  df-we 4546  df-ord 4587  df-on 4588  df-lim 4589  df-suc 4590  df-om 4849  df-xp 4887  df-rel 4888  df-cnv 4889  df-co 4890  df-dm 4891  df-rn 4892  df-res 4893  df-ima 4894  df-iota 5421  df-fun 5459  df-fn 5460  df-f 5461  df-f1 5462  df-fo 5463  df-f1o 5464  df-fv 5465  df-ov 6087  df-oprab 6088  df-mpt2 6089  df-1st 6352  df-2nd 6353  df-riota 6552  df-recs 6636  df-rdg 6671  df-er 6908  df-map 7023  df-en 7113  df-dom 7114  df-sdom 7115  df-sup 7449  df-pnf 9127  df-mnf 9128  df-xr 9129  df-ltxr 9130  df-le 9131  df-sub 9298  df-neg 9299  df-div 9683  df-nn 10006  df-2 10063  df-n0 10227  df-z 10288  df-uz 10494  df-q 10580  df-rp 10618  df-xneg 10715  df-xadd 10716  df-xmul 10717  df-topgen 13672  df-psmet 16699  df-xmet 16700  df-bl 16702  df-mopn 16703  df-top 16968  df-bases 16970  df-topon 16971  df-cnp 17297
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