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Theorem fssres2 6751
Description: Restriction of a restricted function with a subclass of its domain. (Contributed by NM, 21-Jul-2005.)
Assertion
Ref Expression
fssres2 (((𝐹 ↾ 𝐴):𝐴⟶𝐵 ∧ 𝐶 ⊆ 𝐴) → (𝐹 ↾ 𝐶):𝐶⟶𝐵)

Proof of Theorem fssres2
StepHypRef Expression
1 fssres 6749 . 2 (((𝐹 ↾ 𝐴):𝐴⟶𝐵 ∧ 𝐶 ⊆ 𝐴) → ((𝐹 ↾ 𝐴) ↾ 𝐶):𝐶⟶𝐵)
2 resabs1 5996 . . . 4 (𝐶 ⊆ 𝐴 → ((𝐹 ↾ 𝐴) ↾ 𝐶) = (𝐹 ↾ 𝐶))
32feq1d 6692 . . 3 (𝐶 ⊆ 𝐴 → (((𝐹 ↾ 𝐴) ↾ 𝐶):𝐶⟶𝐵 ↔ (𝐹 ↾ 𝐶):𝐶⟶𝐵))
43adantl 487 . 2 (((𝐹 ↾ 𝐴):𝐴⟶𝐵 ∧ 𝐶 ⊆ 𝐴) → (((𝐹 ↾ 𝐴) ↾ 𝐶):𝐶⟶𝐵 ↔ (𝐹 ↾ 𝐶):𝐶⟶𝐵))
51, 4mpbid 235 1 (((𝐹 ↾ 𝐴):𝐴⟶𝐵 ∧ 𝐶 ⊆ 𝐴) → (𝐹 ↾ 𝐶):𝐶⟶𝐵)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   ↔ wb 209   ∧ wa 401   ⊆ wss 3895   ↾ cres 5652  ⟶wf 6535
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-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-xp 5656  df-rel 5657  df-cnv 5658  df-co 5659  df-dm 5660  df-rn 5661  df-res 5662  df-fun 6541  df-fn 6542  df-f 6543
This theorem is used by:  efcvx  26782  filnetlem4  37262
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