Theorem imaeq12d 5083

Description: Equality theorem for image. (Contributed by Mario Carneiro, 4-Dec-2016.)

Hypotheses

Ref	Expression
imaeq1d.1	|- ( ph -> A = B )
imaeq12d.2	|- ( ph -> C = D )

Assertion

Ref	Expression
imaeq12d	|- ( ph -> ( A " C ) = ( B " D ) )

Proof of Theorem imaeq12d

Step	Hyp	Ref	Expression
1		imaeq1d.1	. . 3 |- ( ph -> A = B )
2	1	imaeq1d 5081	. 2 |- ( ph -> ( A " C ) = ( B " C ) )
3		imaeq12d.2	. . 3 |- ( ph -> C = D )
4	3	imaeq2d 5082	. 2 |- ( ph -> ( B " C ) = ( B " D ) )
5	2, 4	eqtrd 2264	1 |- ( ph -> ( A " C ) = ( B " D ) )

Syntax hints:   -> wi 4   = wceq 1398   "cima 4734

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 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-ext 2213

This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1811  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2364  df-v 2805  df-un 3205  df-in 3207  df-ss 3214  df-sn 3679  df-pr 3680  df-op 3682  df-br 4094  df-opab 4156  df-xp 4737  df-cnv 4739  df-dm 4741  df-rn 4742  df-res 4743  df-ima 4744

This theorem is referenced by:  csbima12g  5104  caseinl  7333  caseinr  7334  isunitd  14184