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Theorem relcnvfi 7069
Description: If a relation is finite, its converse is as well. (Contributed by Jim Kingdon, 5-Feb-2022.)
Assertion
Ref Expression
relcnvfi  |-  ( ( Rel  A  /\  A  e.  Fin )  ->  `' A  e.  Fin )

Proof of Theorem relcnvfi
StepHypRef Expression
1 dfrel2 5152 . . . . 5  |-  ( Rel 
A  <->  `' `' A  =  A
)
21biimpi 120 . . . 4  |-  ( Rel 
A  ->  `' `' A  =  A )
32adantr 276 . . 3  |-  ( ( Rel  A  /\  A  e.  Fin )  ->  `' `' A  =  A
)
4 simpr 110 . . 3  |-  ( ( Rel  A  /\  A  e.  Fin )  ->  A  e.  Fin )
53, 4eqeltrd 2284 . 2  |-  ( ( Rel  A  /\  A  e.  Fin )  ->  `' `' A  e.  Fin )
6 relcnv 5079 . . . 4  |-  Rel  `' A
7 cnvexg 5239 . . . 4  |-  ( A  e.  Fin  ->  `' A  e.  _V )
8 cnven 6924 . . . 4  |-  ( ( Rel  `' A  /\  `' A  e.  _V )  ->  `' A  ~~  `' `' A )
96, 7, 8sylancr 414 . . 3  |-  ( A  e.  Fin  ->  `' A  ~~  `' `' A
)
109adantl 277 . 2  |-  ( ( Rel  A  /\  A  e.  Fin )  ->  `' A  ~~  `' `' A
)
11 enfii 6997 . 2  |-  ( ( `' `' A  e.  Fin  /\  `' A  ~~  `' `' A )  ->  `' A  e.  Fin )
125, 10, 11syl2anc 411 1  |-  ( ( Rel  A  /\  A  e.  Fin )  ->  `' A  e.  Fin )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 104    = wceq 1373    e. wcel 2178   _Vcvv 2776   class class class wbr 4059   `'ccnv 4692   Rel wrel 4698    ~~ cen 6848   Fincfn 6850
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-io 711  ax-5 1471  ax-7 1472  ax-gen 1473  ax-ie1 1517  ax-ie2 1518  ax-8 1528  ax-10 1529  ax-11 1530  ax-i12 1531  ax-bndl 1533  ax-4 1534  ax-17 1550  ax-i9 1554  ax-ial 1558  ax-i5r 1559  ax-13 2180  ax-14 2181  ax-ext 2189  ax-sep 4178  ax-pow 4234  ax-pr 4269  ax-un 4498
This theorem depends on definitions:  df-bi 117  df-3an 983  df-tru 1376  df-nf 1485  df-sb 1787  df-eu 2058  df-mo 2059  df-clab 2194  df-cleq 2200  df-clel 2203  df-nfc 2339  df-ral 2491  df-rex 2492  df-v 2778  df-sbc 3006  df-un 3178  df-in 3180  df-ss 3187  df-pw 3628  df-sn 3649  df-pr 3650  df-op 3652  df-uni 3865  df-br 4060  df-opab 4122  df-mpt 4123  df-id 4358  df-xp 4699  df-rel 4700  df-cnv 4701  df-co 4702  df-dm 4703  df-rn 4704  df-res 4705  df-ima 4706  df-iota 5251  df-fun 5292  df-fn 5293  df-f 5294  df-f1 5295  df-fo 5296  df-f1o 5297  df-fv 5298  df-1st 6249  df-2nd 6250  df-er 6643  df-en 6851  df-fin 6853
This theorem is referenced by:  funrnfi  7070  fsumcnv  11863  fprodcnv  12051
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