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Theorem xpimasn 5119
Description: The image of a singleton by a cross product. (Contributed by Thierry Arnoux, 14-Jan-2018.)
Assertion
Ref Expression
xpimasn (𝑋𝐴 → ((𝐴 × 𝐵) “ {𝑋}) = 𝐵)

Proof of Theorem xpimasn
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 snmg 3741 . . 3 (𝑋𝐴 → ∃𝑥 𝑥 ∈ {𝑋})
2 snssi 3767 . . . . . 6 (𝑋𝐴 → {𝑋} ⊆ 𝐴)
3 dfss1 3368 . . . . . 6 ({𝑋} ⊆ 𝐴 ↔ (𝐴 ∩ {𝑋}) = {𝑋})
42, 3sylib 122 . . . . 5 (𝑋𝐴 → (𝐴 ∩ {𝑋}) = {𝑋})
54eleq2d 2266 . . . 4 (𝑋𝐴 → (𝑥 ∈ (𝐴 ∩ {𝑋}) ↔ 𝑥 ∈ {𝑋}))
65exbidv 1839 . . 3 (𝑋𝐴 → (∃𝑥 𝑥 ∈ (𝐴 ∩ {𝑋}) ↔ ∃𝑥 𝑥 ∈ {𝑋}))
71, 6mpbird 167 . 2 (𝑋𝐴 → ∃𝑥 𝑥 ∈ (𝐴 ∩ {𝑋}))
8 xpima2m 5118 . 2 (∃𝑥 𝑥 ∈ (𝐴 ∩ {𝑋}) → ((𝐴 × 𝐵) “ {𝑋}) = 𝐵)
97, 8syl 14 1 (𝑋𝐴 → ((𝐴 × 𝐵) “ {𝑋}) = 𝐵)
Colors of variables: wff set class
Syntax hints:  wi 4   = wceq 1364  wex 1506  wcel 2167  cin 3156  wss 3157  {csn 3623   × cxp 4662  cima 4667
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 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-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-un 3161  df-in 3163  df-ss 3170  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  df-dm 4674  df-rn 4675  df-res 4676  df-ima 4677
This theorem is referenced by:  imasnopn  14619
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