Theorem cokeq2i 4233

Description: Equality inference for Kuratowski composition of two classes. (Contributed by SF, 12-Jan-2015.)

Hypothesis

Ref	Expression
cokeq1i.1	⊢ A = B

Assertion

Ref	Expression
cokeq2i	⊢ (C ∘k A) = (C ∘k B)

Proof of Theorem cokeq2i

Step	Hyp	Ref	Expression
1		cokeq1i.1	. 2 ⊢ A = B
2		cokeq2 4231	. 2 ⊢ (A = B → (C ∘k A) = (C ∘k B))
3	1, 2	ax-mp 5	1 ⊢ (C ∘k A) = (C ∘k B)

Syntax hints:   = wceq 1642   ∘_k ccomk 4180

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1546  ax-5 1557  ax-17 1616  ax-9 1654  ax-8 1675  ax-6 1729  ax-7 1734  ax-11 1746  ax-12 1925  ax-ext 2334

This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3an 936  df-nan 1288  df-tru 1319  df-ex 1542  df-nf 1545  df-sb 1649  df-clab 2340  df-cleq 2346  df-clel 2349  df-nfc 2478  df-rex 2620  df-v 2861  df-nin 3211  df-compl 3212  df-in 3213  df-cnvk 4186  df-ins3k 4188  df-imak 4189  df-cok 4190

This theorem is referenced by:  cokeq12i  4236