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Theorem xp0 5090
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 × ∅) = ∅

Proof of Theorem xp0
StepHypRef Expression
1 0xp 4744 . . 3 (∅ × 𝐴) = ∅
21cnveqi 4842 . 2 (∅ × 𝐴) =
3 cnvxp 5089 . 2 (∅ × 𝐴) = (𝐴 × ∅)
4 cnv0 5074 . 2 ∅ = ∅
52, 3, 43eqtr3i 2225 1 (𝐴 × ∅) = ∅
Colors of variables: wff set class
Syntax hints:   = wceq 1364  c0 3451   × cxp 4662  ccnv 4663
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 615  ax-in2 616  ax-io 710  ax-5 1461  ax-7 1462  ax-gen 1463  ax-ie1 1507  ax-ie2 1508  ax-8 1518  ax-10 1519  ax-11 1520  ax-i12 1521  ax-bndl 1523  ax-4 1524  ax-17 1540  ax-i9 1544  ax-ial 1548  ax-i5r 1549  ax-14 2170  ax-ext 2178  ax-sep 4152  ax-pow 4208  ax-pr 4243
This theorem depends on definitions:  df-bi 117  df-3an 982  df-tru 1367  df-fal 1370  df-nf 1475  df-sb 1777  df-eu 2048  df-mo 2049  df-clab 2183  df-cleq 2189  df-clel 2192  df-nfc 2328  df-ral 2480  df-rex 2481  df-v 2765  df-dif 3159  df-un 3161  df-in 3163  df-ss 3170  df-nul 3452  df-pw 3608  df-sn 3629  df-pr 3630  df-op 3632  df-br 4035  df-opab 4096  df-xp 4670  df-rel 4671  df-cnv 4672
This theorem is referenced by:  xpeq0r  5093  xpdisj2  5096  djuassen  7300  xpdjuen  7301  0met  14704
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