Theorem fcoss 41465

Description: Composition of two mappings. Similar to fco 6526, but with a weaker condition on the domain of 𝐹. (Contributed by Glauco Siliprandi, 3-Mar-2021.)

Hypotheses

Ref	Expression
fcoss.f	⊢ (𝜑 → 𝐹:𝐴⟶𝐵)
fcoss.c	⊢ (𝜑 → 𝐶 ⊆ 𝐴)
fcoss.g	⊢ (𝜑 → 𝐺:𝐷⟶𝐶)

Assertion

Ref	Expression
fcoss	⊢ (𝜑 → (𝐹 ∘ 𝐺):𝐷⟶𝐵)

Proof of Theorem fcoss

Step	Hyp	Ref	Expression
1		fcoss.f	. 2 ⊢ (𝜑 → 𝐹:𝐴⟶𝐵)
2		fcoss.g	. . 3 ⊢ (𝜑 → 𝐺:𝐷⟶𝐶)
3		fcoss.c	. . 3 ⊢ (𝜑 → 𝐶 ⊆ 𝐴)
4	2, 3	fssd 6523	. 2 ⊢ (𝜑 → 𝐺:𝐷⟶𝐴)
5		fco 6526	. 2 ⊢ ((𝐹:𝐴⟶𝐵 ∧ 𝐺:𝐷⟶𝐴) → (𝐹 ∘ 𝐺):𝐷⟶𝐵)
6	1, 4, 5	syl2anc 586	1 ⊢ (𝜑 → (𝐹 ∘ 𝐺):𝐷⟶𝐵)

Syntax hints:   → wi 4   ⊆ wss 3936   ∘ ccom 5554  ⟶wf 6346

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1792  ax-4 1806  ax-5 1907  ax-6 1966  ax-7 2011  ax-8 2112  ax-9 2120  ax-10 2141  ax-11 2156  ax-12 2172  ax-ext 2793  ax-sep 5196  ax-nul 5203  ax-pr 5322

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1085  df-tru 1536  df-ex 1777  df-nf 1781  df-sb 2066  df-mo 2618  df-eu 2650  df-clab 2800  df-cleq 2814  df-clel 2893  df-nfc 2963  df-ral 3143  df-rex 3144  df-rab 3147  df-v 3497  df-dif 3939  df-un 3941  df-in 3943  df-ss 3952  df-nul 4292  df-if 4468  df-sn 4562  df-pr 4564  df-op 4568  df-br 5060  df-opab 5122  df-id 5455  df-xp 5556  df-rel 5557  df-cnv 5558  df-co 5559  df-dm 5560  df-rn 5561  df-fun 6352  df-fn 6353  df-f 6354

This theorem is referenced by:  volicoff  42273  voliooicof  42274  ovolval2  42919  ovolval5lem2  42928  ovnovollem1  42931  ovnovollem2  42932