Theorem eldisjssi 39865

Description: Subclass theorem for disjoint elementhood, inference version. (Contributed by Peter Mazsa, 28-Sep-2021.)

Hypothesis

Ref	Expression
eldisjssi.1	⊢ 𝐴 ⊆ 𝐵

Assertion

Ref	Expression
eldisjssi	⊢ ( ElDisj 𝐵 → ElDisj 𝐴)

Proof of Theorem eldisjssi

Step	Hyp	Ref	Expression
1		eldisjssi.1	. 2 ⊢ 𝐴 ⊆ 𝐵
2		eldisjss 39864	. 2 ⊢ (𝐴 ⊆ 𝐵 → ( ElDisj 𝐵 → ElDisj 𝐴))
3	1, 2	ax-mp 5	1 ⊢ ( ElDisj 𝐵 → ElDisj 𝐴)

This proof depends on syntax axioms:   → wi 4   ⊆ wss 3895   ElDisj weldisj 39247

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1827  ax-4 1841  ax-5 1942  ax-6 1999  ax-7 2040  ax-8 2146  ax-9 2154  ax-11 2193  ax-ext 2732  ax-sep 5248  ax-pr 5390

This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1572  df-fal 1582  df-ex 1812  df-sb 2099  df-clab 2739  df-cleq 2752  df-clel 2835  df-ral 3077  df-rex 3087  df-rab 3413  df-v 3452  df-ss 3896  df-dif 4047  df-in 4091  df-un 4151  df-nul 4279  df-if 4482  df-sn 4585  df-pr 4587  df-op 4835  df-br 5103  df-opab 5167  df-id 5545  df-xp 5656  df-rel 5657  df-cnv 5658  df-co 5659  df-dm 5660  df-rn 5661  df-res 5662  df-coss 39527  df-cnvrefrel 39633  df-funALTV 39793  df-disjALTV 39816  df-eldisj 39818

This theorem is used by: (None)