Theorem xp0 5163

Description: The cross product with the empty set is empty. Part of Theorem 3.13(ii) of [Monk1] p. 37. (Contributed by NM, 12-Apr-2004.)

Assertion

Ref	Expression
xp0	|- ( A X. (/) ) = (/)

Proof of Theorem xp0

Step	Hyp	Ref	Expression
1		0xp 4812	. . 3 |- ( (/) X. A ) = (/)
2	1	cnveqi 4911	. 2 |- `' ( (/) X. A ) = `' (/)
3		cnvxp 5162	. 2 |- `' ( (/) X. A ) = ( A X. (/) )
4		cnv0 5147	. 2 |- `' (/) = (/)
5	2, 3, 4	3eqtr3i 2260	1 |- ( A X. (/) ) = (/)

Syntax hints:   = wceq 1398   (/)c0 3496   X. cxp 4729   `'ccnv 4730

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-in1 619  ax-in2 620  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-14 2205  ax-ext 2213  ax-sep 4212  ax-pow 4270  ax-pr 4305

This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2364  df-ral 2516  df-rex 2517  df-v 2805  df-dif 3203  df-un 3205  df-in 3207  df-ss 3214  df-nul 3497  df-pw 3658  df-sn 3679  df-pr 3680  df-op 3682  df-br 4094  df-opab 4156  df-xp 4737  df-rel 4738  df-cnv 4739

This theorem is referenced by:  xpeq0r  5166  xpdisj2  5169  djuassen  7475  xpdjuen  7476  0met  15178