Theorem disjsnxp 45057

Description: The sets in the cartesian product of singletons with other sets, are disjoint. (Contributed by Glauco Siliprandi, 11-Oct-2020.)

Assertion

Ref	Expression
disjsnxp	⊢ Disj 𝑗 ∈ 𝐴 ({𝑗} × 𝐵)

Distinct variable group:   𝐴,𝑗

Allowed substitution hint:   𝐵(𝑗)

Proof of Theorem disjsnxp

Step	Hyp	Ref	Expression
1		sndisj 5101	. . . 4 ⊢ Disj 𝑗 ∈ 𝐴 {𝑗}
2	1	a1i 11	. . 3 ⊢ (⊤ → Disj 𝑗 ∈ 𝐴 {𝑗})
3	2	disjxp1 45056	. 2 ⊢ (⊤ → Disj 𝑗 ∈ 𝐴 ({𝑗} × 𝐵))
4	3	mptru 1547	1 ⊢ Disj 𝑗 ∈ 𝐴 ({𝑗} × 𝐵)

Syntax hints:  ⊤wtru 1541  {csn 4591  Disj wdisj 5076   × cxp 5638

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2008  ax-8 2111  ax-9 2119  ax-10 2142  ax-11 2158  ax-12 2178  ax-ext 2702  ax-sep 5253  ax-nul 5263  ax-pr 5389

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-nf 1784  df-sb 2066  df-mo 2534  df-clab 2709  df-cleq 2722  df-clel 2804  df-nfc 2879  df-ne 2927  df-ral 3046  df-rex 3055  df-rmo 3356  df-rab 3409  df-v 3452  df-sbc 3756  df-csb 3865  df-dif 3919  df-un 3921  df-in 3923  df-ss 3933  df-nul 4299  df-if 4491  df-sn 4592  df-pr 4594  df-op 4598  df-disj 5077  df-opab 5172  df-xp 5646  df-rel 5647

This theorem is referenced by:  sge0xp  46420