Theorem fssresd 5235

Description: Restriction of a function with a subclass of its domain, deduction form. (Contributed by Glauco Siliprandi, 11-Dec-2019.)

Hypotheses

Ref	Expression
fssresd.1	⊢ (𝜑 → 𝐹:𝐴⟶𝐵)
fssresd.2	⊢ (𝜑 → 𝐶 ⊆ 𝐴)

Assertion

Ref	Expression
fssresd	⊢ (𝜑 → (𝐹 ↾ 𝐶):𝐶⟶𝐵)

Proof of Theorem fssresd

Step	Hyp	Ref	Expression
1		fssresd.1	. 2 ⊢ (𝜑 → 𝐹:𝐴⟶𝐵)
2		fssresd.2	. 2 ⊢ (𝜑 → 𝐶 ⊆ 𝐴)
3		fssres 5234	. 2 ⊢ ((𝐹:𝐴⟶𝐵 ∧ 𝐶 ⊆ 𝐴) → (𝐹 ↾ 𝐶):𝐶⟶𝐵)
4	1, 2, 3	syl2anc 406	1 ⊢ (𝜑 → (𝐹 ↾ 𝐶):𝐶⟶𝐵)

Syntax hints:   → wi 4   ⊆ wss 3021   ↾ cres 4479  ⟶wf 5055

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 671  ax-5 1391  ax-7 1392  ax-gen 1393  ax-ie1 1437  ax-ie2 1438  ax-8 1450  ax-10 1451  ax-11 1452  ax-i12 1453  ax-bndl 1454  ax-4 1455  ax-14 1460  ax-17 1474  ax-i9 1478  ax-ial 1482  ax-i5r 1483  ax-ext 2082  ax-sep 3986  ax-pow 4038  ax-pr 4069

This theorem depends on definitions:  df-bi 116  df-3an 932  df-tru 1302  df-nf 1405  df-sb 1704  df-clab 2087  df-cleq 2093  df-clel 2096  df-nfc 2229  df-ral 2380  df-rex 2381  df-v 2643  df-un 3025  df-in 3027  df-ss 3034  df-pw 3459  df-sn 3480  df-pr 3481  df-op 3483  df-br 3876  df-opab 3930  df-xp 4483  df-rel 4484  df-cnv 4485  df-co 4486  df-dm 4487  df-rn 4488  df-res 4489  df-fun 5061  df-fn 5062  df-f 5063

This theorem is referenced by:  cnrest  12185  cnptopresti  12188  cnptoprest  12189  psmetres2  12261  xmetres2  12307  metres2  12309  xmetresbl  12368  rescncf  12481  trilpolemlt1  12818