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Theorem isscon 23772
Description: The property of being a simply connected topological space. (Contributed by Mario Carneiro, 11-Feb-2015.)
Assertion
Ref Expression
isscon  |-  ( J  e. SCon 
<->  ( J  e. PCon  /\  A. f  e.  ( II 
Cn  J ) ( ( f `  0
)  =  ( f `
 1 )  -> 
f (  ~=ph  `  J
) ( ( 0 [,] 1 )  X. 
{ ( f ` 
0 ) } ) ) ) )
Distinct variable group:    f, J

Proof of Theorem isscon
Dummy variable  j is distinct from all other variables.
StepHypRef Expression
1 oveq2 5882 . . 3  |-  ( j  =  J  ->  (
II  Cn  j )  =  ( II  Cn  J ) )
2 fveq2 5541 . . . . 5  |-  ( j  =  J  ->  (  ~=ph  `  j )  =  ( 
~=ph  `  J ) )
32breqd 4050 . . . 4  |-  ( j  =  J  ->  (
f (  ~=ph  `  j
) ( ( 0 [,] 1 )  X. 
{ ( f ` 
0 ) } )  <-> 
f (  ~=ph  `  J
) ( ( 0 [,] 1 )  X. 
{ ( f ` 
0 ) } ) ) )
43imbi2d 307 . . 3  |-  ( j  =  J  ->  (
( ( f ` 
0 )  =  ( f `  1 )  ->  f (  ~=ph  `  j ) ( ( 0 [,] 1 )  X.  { ( f `
 0 ) } ) )  <->  ( (
f `  0 )  =  ( f ` 
1 )  ->  f
(  ~=ph  `  J )
( ( 0 [,] 1 )  X.  {
( f `  0
) } ) ) ) )
51, 4raleqbidv 2761 . 2  |-  ( j  =  J  ->  ( A. f  e.  (
II  Cn  j )
( ( f ` 
0 )  =  ( f `  1 )  ->  f (  ~=ph  `  j ) ( ( 0 [,] 1 )  X.  { ( f `
 0 ) } ) )  <->  A. f  e.  ( II  Cn  J
) ( ( f `
 0 )  =  ( f `  1
)  ->  f (  ~=ph  `  J ) ( ( 0 [,] 1 )  X.  { ( f `
 0 ) } ) ) ) )
6 df-scon 23768 . 2  |- SCon  =  {
j  e. PCon  |  A. f  e.  ( II  Cn  j ) ( ( f `  0 )  =  ( f ` 
1 )  ->  f
(  ~=ph  `  j )
( ( 0 [,] 1 )  X.  {
( f `  0
) } ) ) }
75, 6elrab2 2938 1  |-  ( J  e. SCon 
<->  ( J  e. PCon  /\  A. f  e.  ( II 
Cn  J ) ( ( f `  0
)  =  ( f `
 1 )  -> 
f (  ~=ph  `  J
) ( ( 0 [,] 1 )  X. 
{ ( f ` 
0 ) } ) ) ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    <-> wb 176    /\ wa 358    = wceq 1632    e. wcel 1696   A.wral 2556   {csn 3653   class class class wbr 4039    X. cxp 4703   ` cfv 5271  (class class class)co 5874   0cc0 8753   1c1 8754   [,]cicc 10675    Cn ccn 16970   IIcii 18395    ~=ph cphtpc 18483  PConcpcon 23765  SConcscon 23766
This theorem is referenced by:  sconpcon  23773  sconpht  23775  sconpi1  23785  txscon  23787  cvxscon  23789
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-6 1715  ax-7 1720  ax-11 1727  ax-12 1878  ax-ext 2277
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3an 936  df-tru 1310  df-ex 1532  df-nf 1535  df-sb 1639  df-clab 2283  df-cleq 2289  df-clel 2292  df-nfc 2421  df-ral 2561  df-rex 2562  df-rab 2565  df-v 2803  df-dif 3168  df-un 3170  df-in 3172  df-ss 3179  df-nul 3469  df-if 3579  df-sn 3659  df-pr 3660  df-op 3662  df-uni 3844  df-br 4040  df-iota 5235  df-fv 5279  df-ov 5877  df-scon 23768
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