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Theorem xpcanm 4986
Description: Cancellation law for cross-product. (Contributed by Jim Kingdon, 14-Dec-2018.)
Assertion
Ref Expression
xpcanm (∃𝑥 𝑥𝐶 → ((𝐶 × 𝐴) = (𝐶 × 𝐵) ↔ 𝐴 = 𝐵))
Distinct variable group:   𝑥,𝐶
Allowed substitution hints:   𝐴(𝑥)   𝐵(𝑥)

Proof of Theorem xpcanm
StepHypRef Expression
1 ssxp2 4984 . . 3 (∃𝑥 𝑥𝐶 → ((𝐶 × 𝐴) ⊆ (𝐶 × 𝐵) ↔ 𝐴𝐵))
2 ssxp2 4984 . . 3 (∃𝑥 𝑥𝐶 → ((𝐶 × 𝐵) ⊆ (𝐶 × 𝐴) ↔ 𝐵𝐴))
31, 2anbi12d 465 . 2 (∃𝑥 𝑥𝐶 → (((𝐶 × 𝐴) ⊆ (𝐶 × 𝐵) ∧ (𝐶 × 𝐵) ⊆ (𝐶 × 𝐴)) ↔ (𝐴𝐵𝐵𝐴)))
4 eqss 3117 . 2 ((𝐶 × 𝐴) = (𝐶 × 𝐵) ↔ ((𝐶 × 𝐴) ⊆ (𝐶 × 𝐵) ∧ (𝐶 × 𝐵) ⊆ (𝐶 × 𝐴)))
5 eqss 3117 . 2 (𝐴 = 𝐵 ↔ (𝐴𝐵𝐵𝐴))
63, 4, 53bitr4g 222 1 (∃𝑥 𝑥𝐶 → ((𝐶 × 𝐴) = (𝐶 × 𝐵) ↔ 𝐴 = 𝐵))
Colors of variables: wff set class
Syntax hints:  wi 4  wa 103  wb 104   = wceq 1332  wex 1469  wcel 1481  wss 3076   × cxp 4545
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 699  ax-5 1424  ax-7 1425  ax-gen 1426  ax-ie1 1470  ax-ie2 1471  ax-8 1483  ax-10 1484  ax-11 1485  ax-i12 1486  ax-bndl 1487  ax-4 1488  ax-14 1493  ax-17 1507  ax-i9 1511  ax-ial 1515  ax-i5r 1516  ax-ext 2122  ax-sep 4054  ax-pow 4106  ax-pr 4139
This theorem depends on definitions:  df-bi 116  df-3an 965  df-tru 1335  df-nf 1438  df-sb 1737  df-eu 2003  df-mo 2004  df-clab 2127  df-cleq 2133  df-clel 2136  df-nfc 2271  df-ral 2422  df-rex 2423  df-v 2691  df-un 3080  df-in 3082  df-ss 3089  df-pw 3517  df-sn 3538  df-pr 3539  df-op 3541  df-br 3938  df-opab 3998  df-xp 4553  df-rel 4554  df-cnv 4555  df-dm 4557  df-rn 4558
This theorem is referenced by: (None)
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