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Theorem metcnp2 18560
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 18559 (and Munkres' metcn 18561) for compatibility with df-lm 17281. 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 18559 . 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 960 . . . . . . . . . . 11  |-  ( ( ( C  e.  ( * Met `  X
)  /\  D  e.  ( * Met `  Y
)  /\  P  e.  X )  /\  F : X --> Y )  ->  C  e.  ( * Met `  X ) )
54ad2antrr 707 . . . . . . . . . 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 962 . . . . . . . . . . 11  |-  ( ( ( C  e.  ( * Met `  X
)  /\  D  e.  ( * Met `  Y
)  /\  P  e.  X )  /\  F : X --> Y )  ->  P  e.  X )
76ad2antrr 707 . . . . . . . . . 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 448 . . . . . . . . . 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 18365 . . . . . . . . . 10  |-  ( ( C  e.  ( * Met `  X )  /\  P  e.  X  /\  w  e.  X
)  ->  ( P C w )  =  ( w C P ) )
105, 7, 8, 9syl3anc 1184 . . . . . . . . 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 4214 . . . . . . . 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 961 . . . . . . . . . . 11  |-  ( ( ( C  e.  ( * Met `  X
)  /\  D  e.  ( * Met `  Y
)  /\  P  e.  X )  /\  F : X --> Y )  ->  D  e.  ( * Met `  Y ) )
1312ad2antrr 707 . . . . . . . . . 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 736 . . . . . . . . . . 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 5862 . . . . . . . . . 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 5862 . . . . . . . . . 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 18365 . . . . . . . . . 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 1184 . . . . . . . . 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 4214 . . . . . . . 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 312 . . . . . . 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 2713 . . . . . 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 630 . . . . 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 2714 . . . 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 2713 . . 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 623 . 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 245 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 177    /\ wa 359    /\ w3a 936    = wceq 1652    e. wcel 1725   A.wral 2697   E.wrex 2698   class class class wbr 4204   -->wf 5441   ` cfv 5445  (class class class)co 6072    < clt 9109   RR+crp 10601   * Metcxmt 16674   MetOpencmopn 16679    CnP ccnp 17277
This theorem is referenced by:  metcnpi2  18563  rlimcnp  20792
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1555  ax-5 1566  ax-17 1626  ax-9 1666  ax-8 1687  ax-13 1727  ax-14 1729  ax-6 1744  ax-7 1749  ax-11 1761  ax-12 1950  ax-ext 2416  ax-sep 4322  ax-nul 4330  ax-pow 4369  ax-pr 4395  ax-un 4692  ax-cnex 9035  ax-resscn 9036  ax-1cn 9037  ax-icn 9038  ax-addcl 9039  ax-addrcl 9040  ax-mulcl 9041  ax-mulrcl 9042  ax-mulcom 9043  ax-addass 9044  ax-mulass 9045  ax-distr 9046  ax-i2m1 9047  ax-1ne0 9048  ax-1rid 9049  ax-rnegex 9050  ax-rrecex 9051  ax-cnre 9052  ax-pre-lttri 9053  ax-pre-lttrn 9054  ax-pre-ltadd 9055  ax-pre-mulgt0 9056  ax-pre-sup 9057
This theorem depends on definitions:  df-bi 178  df-or 360  df-an 361  df-3or 937  df-3an 938  df-tru 1328  df-ex 1551  df-nf 1554  df-sb 1659  df-eu 2284  df-mo 2285  df-clab 2422  df-cleq 2428  df-clel 2431  df-nfc 2560  df-ne 2600  df-nel 2601  df-ral 2702  df-rex 2703  df-reu 2704  df-rmo 2705  df-rab 2706  df-v 2950  df-sbc 3154  df-csb 3244  df-dif 3315  df-un 3317  df-in 3319  df-ss 3326  df-pss 3328  df-nul 3621  df-if 3732  df-pw 3793  df-sn 3812  df-pr 3813  df-tp 3814  df-op 3815  df-uni 4008  df-iun 4087  df-br 4205  df-opab 4259  df-mpt 4260  df-tr 4295  df-eprel 4486  df-id 4490  df-po 4495  df-so 4496  df-fr 4533  df-we 4535  df-ord 4576  df-on 4577  df-lim 4578  df-suc 4579  df-om 4837  df-xp 4875  df-rel 4876  df-cnv 4877  df-co 4878  df-dm 4879  df-rn 4880  df-res 4881  df-ima 4882  df-iota 5409  df-fun 5447  df-fn 5448  df-f 5449  df-f1 5450  df-fo 5451  df-f1o 5452  df-fv 5453  df-ov 6075  df-oprab 6076  df-mpt2 6077  df-1st 6340  df-2nd 6341  df-riota 6540  df-recs 6624  df-rdg 6659  df-er 6896  df-map 7011  df-en 7101  df-dom 7102  df-sdom 7103  df-sup 7437  df-pnf 9111  df-mnf 9112  df-xr 9113  df-ltxr 9114  df-le 9115  df-sub 9282  df-neg 9283  df-div 9667  df-nn 9990  df-2 10047  df-n0 10211  df-z 10272  df-uz 10478  df-q 10564  df-rp 10602  df-xneg 10699  df-xadd 10700  df-xmul 10701  df-topgen 13655  df-psmet 16682  df-xmet 16683  df-bl 16685  df-mopn 16686  df-top 16951  df-bases 16953  df-topon 16954  df-cnp 17280
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