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Theorem s1prc 11369
Description: Value of a singleton word if the symbol is a proper class. (Contributed by AV, 26-Mar-2022.)
Assertion
Ref Expression
s1prc  |-  ( -.  A  e.  _V  ->  <" A ">  =  <" (/) "> )

Proof of Theorem s1prc
StepHypRef Expression
1 fvprc 5684 . . . 4  |-  ( -.  A  e.  _V  ->  (  _I  `  A )  =  (/) )
21opeq2d 3906 . . 3  |-  ( -.  A  e.  _V  ->  <.
0 ,  (  _I 
`  A ) >.  =  <. 0 ,  (/) >.
)
32sneqd 3718 . 2  |-  ( -.  A  e.  _V  ->  {
<. 0 ,  (  _I  `  A )
>. }  =  { <. 0 ,  (/) >. } )
4 df-s1 11362 . 2  |-  <" A ">  =  { <. 0 ,  (  _I  `  A ) >. }
5 0ex 4255 . . 3  |-  (/)  e.  _V
6 s1val 11363 . . 3  |-  ( (/)  e.  _V  ->  <" (/) ">  =  { <. 0 ,  (/) >. } )
75, 6ax-mp 5 . 2  |-  <" (/) ">  =  { <. 0 ,  (/) >. }
83, 4, 73eqtr4g 2296 1  |-  ( -.  A  e.  _V  ->  <" A ">  =  <" (/) "> )
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4    = wceq 1402    e. wcel 2209   _Vcvv 2821   (/)c0 3520   {csn 3705   <.cop 3708    _I cid 4428   ` cfv 5372   0cc0 8169   <"cs1 11361
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 623  ax-in2 624  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4244  ax-nul 4254  ax-pow 4306  ax-pr 4341  ax-setind 4679
This theorem depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-fal 1408  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ne 2421  df-ral 2533  df-rex 2534  df-v 2823  df-sbc 3052  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-nul 3521  df-pw 3687  df-sn 3711  df-pr 3712  df-op 3714  df-uni 3931  df-br 4126  df-opab 4188  df-id 4433  df-xp 4775  df-rel 4776  df-cnv 4777  df-co 4778  df-dm 4779  df-iota 5332  df-fun 5374  df-fv 5380  df-s1 11362
This theorem is referenced by: (None)
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