Theorem coemptyd 14932

Description: Deduction about composition of classes with no relational content in common. (Contributed by RP, 24-Dec-2019.)

Hypothesis

Ref	Expression
coemptyd.1	⊢ (𝜑 → (dom 𝐴 ∩ ran 𝐵) = ∅)

Assertion

Ref	Expression
coemptyd	⊢ (𝜑 → (𝐴 ∘ 𝐵) = ∅)

Proof of Theorem coemptyd

Step	Hyp	Ref	Expression
1		coemptyd.1	. 2 ⊢ (𝜑 → (dom 𝐴 ∩ ran 𝐵) = ∅)
2		coeq0 6248	. 2 ⊢ ((𝐴 ∘ 𝐵) = ∅ ↔ (dom 𝐴 ∩ ran 𝐵) = ∅)
3	1, 2	sylibr 233	1 ⊢ (𝜑 → (𝐴 ∘ 𝐵) = ∅)

Syntax hints:   → wi 4   = wceq 1533   ∩ cin 3942  ∅c0 4317  dom cdm 5669  ran crn 5670   ∘ ccom 5673

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1789  ax-4 1803  ax-5 1905  ax-6 1963  ax-7 2003  ax-8 2100  ax-9 2108  ax-10 2129  ax-11 2146  ax-12 2163  ax-ext 2697  ax-sep 5292  ax-nul 5299  ax-pr 5420

This theorem depends on definitions:  df-bi 206  df-an 396  df-or 845  df-3an 1086  df-tru 1536  df-fal 1546  df-ex 1774  df-nf 1778  df-sb 2060  df-clab 2704  df-cleq 2718  df-clel 2804  df-ral 3056  df-rex 3065  df-rab 3427  df-v 3470  df-dif 3946  df-un 3948  df-in 3950  df-ss 3960  df-nul 4318  df-if 4524  df-sn 4624  df-pr 4626  df-op 4630  df-br 5142  df-opab 5204  df-xp 5675  df-rel 5676  df-cnv 5677  df-co 5678  df-dm 5679  df-rn 5680  df-res 5681

This theorem is referenced by:  xptrrel  14933  cosnopne  32423  coeq0i  42066  conrel1d  42987  conrel2d  42988  clsneibex  43426  neicvgbex  43436