Theorem disjsnxp 46361

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 5100	. . . 4 ⊢ Disj 𝑗 ∈ 𝐴 {𝑗}
2	1	a1i 11	. . 3 ⊢ (⊤ → Disj 𝑗 ∈ 𝐴 {𝑗})
3	2	disjxp1 46360	. 2 ⊢ (⊤ → Disj 𝑗 ∈ 𝐴 ({𝑗} × 𝐵))
4	3	mptru 1577	1 ⊢ Disj 𝑗 ∈ 𝐴 ({𝑗} × 𝐵)

This proof depends on syntax axioms:  ⊤wtru 1571  {csn 4588  Disj wdisj 5075   × cxp 5656

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1945  ax-6 2002  ax-7 2043  ax-8 2149  ax-9 2157  ax-10 2180  ax-11 2197  ax-12 2216  ax-ext 2735  ax-sep 5255  ax-pr 5398

This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2102  df-mo 2567  df-clab 2742  df-cleq 2755  df-clel 2839  df-nfc 2913  df-ne 2960  df-ral 3081  df-rex 3091  df-rmo 3369  df-rab 3417  df-v 3456  df-sbc 3743  df-csb 3852  df-ss 3901  df-dif 4050  df-in 4094  df-un 4154  df-nul 4282  df-if 4486  df-sn 4589  df-pr 4591  df-op 4841  df-disj 5076  df-opab 5174  df-xp 5664  df-rel 5665

This theorem is used by:  sge0xp  47712