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Theorem fcoss 46192
Description: Composition of two mappings. Similar to fco 6732, 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
StepHypRef Expression
1 fcoss.f . 2 (𝜑 → 𝐹:𝐴⟶𝐵)
2 fcoss.g . . 3 (𝜑 → 𝐺:𝐷⟶𝐶)
3 fcoss.c . . 3 (𝜑 → 𝐶 ⊆ 𝐴)
42, 3fssd 6725 . 2 (𝜑 → 𝐺:𝐷⟶𝐴)
5 fco 6732 . 2 ((𝐹:𝐴⟶𝐵 ∧ 𝐺:𝐷⟶𝐴) → (𝐹 ∘ 𝐺):𝐷⟶𝐵)
61, 4, 5syl2anc 596 1 (𝜑 → (𝐹 ∘ 𝐺):𝐷⟶𝐵)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   ⊆ wss 3899   ∘ ccom 5655  ⟶wf 6533
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 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-10 2178  ax-11 2194  ax-12 2213  ax-ext 2733  ax-sep 5249  ax-pr 5391
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 2100  df-mo 2565  df-clab 2740  df-cleq 2753  df-clel 2836  df-nfc 2910  df-ral 3078  df-rex 3088  df-rab 3414  df-v 3453  df-dif 3902  df-un 3904  df-in 3906  df-ss 3916  df-nul 4280  df-if 4483  df-sn 4585  df-pr 4587  df-op 4591  df-br 5104  df-opab 5168  df-id 5546  df-xp 5657  df-rel 5658  df-cnv 5659  df-co 5660  df-dm 5661  df-rn 5662  df-res 5663  df-ima 5664  df-fun 6539  df-fn 6540  df-f 6541
This theorem is used by:  volicoff  46974  voliooicof  46975  hoicvr  47527  ovolval2  47623  ovolval5lem2  47632  ovolval5lem3  47633  ovnovollem1  47635  ovnovollem2  47636
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