Theorem xpkeq12i 4204

Description: Equality inference for Kuratowski cross product. (Contributed by SF, 12-Jan-2015.)

Hypotheses

Ref	Expression
xpkeq12i.1	⊢ A = B
xpkeq12i.2	⊢ C = D

Assertion

Ref	Expression
xpkeq12i	⊢ (A ×k C) = (B ×k D)

Proof of Theorem xpkeq12i

Step	Hyp	Ref	Expression
1		xpkeq12i.1	. 2 ⊢ A = B
2		xpkeq12i.2	. 2 ⊢ C = D
3		xpkeq12 4201	. 2 ⊢ ((A = B ∧ C = D) → (A ×k C) = (B ×k D))
4	1, 2, 3	mp2an 653	1 ⊢ (A ×k C) = (B ×k D)

Syntax hints:   = wceq 1642   ×_k cxpk 4175

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  ax-nin 4079  ax-sn 4088

This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  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 2479  df-ne 2519  df-rex 2621  df-v 2862  df-nin 3212  df-compl 3213  df-in 3214  df-un 3215  df-dif 3216  df-ss 3260  df-nul 3552  df-sn 3742  df-pr 3743  df-opk 4059  df-xpk 4186

This theorem is referenced by:  xpkexg  4289