Theorem djucllem 16742

Description: Lemma for djulcl 7381 and djurcl 7382. (Contributed by BJ, 4-Jul-2022.)

Hypotheses

Ref	Expression
djucllem.1	|- X e. _V
djucllem.2	|- F = ( x e. _V |-> <. X , x >. )

Assertion

Ref	Expression
djucllem	|- ( A e. B -> ( ( F |` B ) ` A ) e. ( { X } X. B ) )

Distinct variable groups:   x, A   x, X

Allowed substitution hints:   B( x)   F( x)

Proof of Theorem djucllem

Step	Hyp	Ref	Expression
1		fvres 5714	. . 3 |- ( A e. B -> ( ( F |` B ) ` A ) = ( F ` A ) )
2		elex 2833	. . . 4 |- ( A e. B -> A e. _V )
3		djucllem.1	. . . . . 6 |- X e. _V
4	3	snid 3736	. . . . 5 |- X e. { X }
5		opelxpi 4801	. . . . 5 |- ( ( X e. { X } /\ A e. B ) -> <. X , A >. e. ( { X } X. B ) )
6	4, 5	mpan 428	. . . 4 |- ( A e. B -> <. X , A >. e. ( { X } X. B ) )
7		opeq2 3900	. . . . 5 |- ( x = A -> <. X , x >. = <. X , A >. )
8		djucllem.2	. . . . 5 |- F = ( x e. _V |-> <. X , x >. )
9	7, 8	fvmptg 5775	. . . 4 |- ( ( A e. _V /\ <. X , A >. e. ( { X } X. B ) ) -> ( F ` A ) = <. X , A >. )
10	2, 6, 9	syl2anc 415	. . 3 |- ( A e. B -> ( F ` A ) = <. X , A >. )
11	1, 10	eqtrd 2271	. 2 |- ( A e. B -> ( ( F |` B ) ` A ) = <. X , A >. )
12	11, 6	eqeltrd 2315	1 |- ( A e. B -> ( ( F |` B ) ` A ) e. ( { X } X. B ) )

Syntax hints:   -> wi 4   = wceq 1402   e. wcel 2209   _Vcvv 2821   {csn 3705   <.cop 3708   |-> cmpt 4187   X. cxp 4767   |` cres 4771   ` cfv 5372

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 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-pow 4306  ax-pr 4341

This theorem depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  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-ral 2533  df-rex 2534  df-v 2823  df-sbc 3052  df-un 3224  df-in 3226  df-ss 3233  df-pw 3687  df-sn 3711  df-pr 3712  df-op 3714  df-uni 3931  df-br 4126  df-opab 4188  df-mpt 4189  df-id 4433  df-xp 4775  df-rel 4776  df-cnv 4777  df-co 4778  df-dm 4779  df-res 4781  df-iota 5332  df-fun 5374  df-fv 5380

This theorem is referenced by:  djulclALT  16743  djurclALT  16744