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Theorem tfr0 6556
Description: Transfinite recursion at the empty set. (Contributed by Jim Kingdon, 8-May-2020.)
Hypothesis
Ref Expression
tfr.1  |-  F  = recs ( G )
Assertion
Ref Expression
tfr0  |-  ( ( G `  (/) )  e.  V  ->  ( F `  (/) )  =  ( G `  (/) ) )

Proof of Theorem tfr0
StepHypRef Expression
1 tfr.1 . . . 4  |-  F  = recs ( G )
21tfr0dm 6555 . . 3  |-  ( ( G `  (/) )  e.  V  ->  (/)  e.  dom  F )
31tfr2a 6554 . . 3  |-  ( (/)  e.  dom  F  ->  ( F `  (/) )  =  ( G `  ( F  |`  (/) ) ) )
42, 3syl 14 . 2  |-  ( ( G `  (/) )  e.  V  ->  ( F `  (/) )  =  ( G `  ( F  |`  (/) ) ) )
5 res0 5044 . . 3  |-  ( F  |`  (/) )  =  (/)
65fveq2i 5675 . 2  |-  ( G `
 ( F  |`  (/) ) )  =  ( G `  (/) )
74, 6eqtrdi 2283 1  |-  ( ( G `  (/) )  e.  V  ->  ( F `  (/) )  =  ( G `  (/) ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    = wceq 1398    e. wcel 2205   (/)c0 3510   dom cdm 4751    |` cres 4753   ` cfv 5354  recscrecs 6537
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 619  ax-in2 620  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2207  ax-14 2208  ax-ext 2216  ax-sep 4230  ax-nul 4238  ax-pow 4289  ax-pr 4324  ax-un 4556  ax-setind 4661
This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1812  df-eu 2085  df-mo 2086  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ral 2527  df-rex 2528  df-rab 2531  df-v 2817  df-sbc 3045  df-csb 3141  df-dif 3215  df-un 3217  df-in 3219  df-ss 3226  df-nul 3511  df-pw 3673  df-sn 3697  df-pr 3698  df-op 3700  df-uni 3917  df-iun 3995  df-br 4112  df-opab 4174  df-mpt 4175  df-tr 4211  df-id 4416  df-iord 4489  df-on 4491  df-suc 4494  df-xp 4757  df-rel 4758  df-cnv 4759  df-co 4760  df-dm 4761  df-res 4763  df-iota 5314  df-fun 5356  df-fn 5357  df-fv 5362  df-recs 6538
This theorem is referenced by:  rdg0  6620  frec0g  6630
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