Theorem difeq1i 3251

Description: Inference adding difference to the right in a class equality. (Contributed by NM, 15-Nov-2002.)

Hypothesis

Ref	Expression
difeq1i.1	|- A = B

Assertion

Ref	Expression
difeq1i	|- ( A \ C ) = ( B \ C )

Proof of Theorem difeq1i

Step	Hyp	Ref	Expression
1		difeq1i.1	. 2 |- A = B
2		difeq1 3248	. 2 |- ( A = B -> ( A \ C ) = ( B \ C ) )
3	1, 2	ax-mp 5	1 |- ( A \ C ) = ( B \ C )

Syntax hints:   = wceq 1353   \ cdif 3128

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 709  ax-5 1447  ax-7 1448  ax-gen 1449  ax-ie1 1493  ax-ie2 1494  ax-8 1504  ax-10 1505  ax-11 1506  ax-i12 1507  ax-bndl 1509  ax-4 1510  ax-17 1526  ax-i9 1530  ax-ial 1534  ax-i5r 1535  ax-ext 2159

This theorem depends on definitions:  df-bi 117  df-tru 1356  df-nf 1461  df-sb 1763  df-clab 2164  df-cleq 2170  df-clel 2173  df-nfc 2308  df-rab 2464  df-dif 3133

This theorem is referenced by:  difeq12i  3253  indif1  3382  indifcom  3383  difun1  3397  notab  3407  notrab  3414  difprsn1  3733  difprsn2  3734  orddif  4548  resdifcom  4927  resdmdfsn  4952  phplem1  6854  dfn2  9191