Theorem fssd 5221

Description: Expanding the codomain of a mapping, deduction form. (Contributed by Glauco Siliprandi, 11-Dec-2019.)

Hypotheses

Ref	Expression
fssd.f	⊢ (𝜑 → 𝐹:𝐴⟶𝐵)
fssd.b	⊢ (𝜑 → 𝐵 ⊆ 𝐶)

Assertion

Ref	Expression
fssd	⊢ (𝜑 → 𝐹:𝐴⟶𝐶)

Proof of Theorem fssd

Step	Hyp	Ref	Expression
1		fssd.f	. 2 ⊢ (𝜑 → 𝐹:𝐴⟶𝐵)
2		fssd.b	. 2 ⊢ (𝜑 → 𝐵 ⊆ 𝐶)
3		fss 5220	. 2 ⊢ ((𝐹:𝐴⟶𝐵 ∧ 𝐵 ⊆ 𝐶) → 𝐹:𝐴⟶𝐶)
4	1, 2, 3	syl2anc 406	1 ⊢ (𝜑 → 𝐹:𝐴⟶𝐶)

Syntax hints:   → wi 4   ⊆ wss 3021  ⟶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-5 1391  ax-7 1392  ax-gen 1393  ax-ie1 1437  ax-ie2 1438  ax-8 1450  ax-11 1452  ax-4 1455  ax-17 1474  ax-i9 1478  ax-ial 1482  ax-i5r 1483  ax-ext 2082

This theorem depends on definitions:  df-bi 116  df-nf 1405  df-sb 1704  df-clab 2087  df-cleq 2093  df-clel 2096  df-in 3027  df-ss 3034  df-f 5063

This theorem is referenced by:  mapss  6515  ac6sfi  6721  fseq1p1m1  9715  resqrexlemcvg  10631  resqrexlemsqa  10636  climcvg1nlem  10957  fsumcl2lem  11006  ennnfonelemh  11709  cnrest2  12186  cnptoprest2  12190  cncfss  12483  limccnpcntop  12520  isomninnlem  12809  trilpolemisumle  12815