Theorem f1ff1 5224

Description: If a function is one-to-one from A to B and is also a function from A to C, then it is a one-to-one function from A to C. (Contributed by BJ, 4-Jul-2022.)

Assertion

Ref	Expression
f1ff1	⊢ ((𝐹:𝐴–1-1→𝐵 ∧ 𝐹:𝐴⟶𝐶) → 𝐹:𝐴–1-1→𝐶)

Proof of Theorem f1ff1

Step	Hyp	Ref	Expression
1		frn 5169	. 2 ⊢ (𝐹:𝐴⟶𝐶 → ran 𝐹 ⊆ 𝐶)
2		f1ssr 5223	. 2 ⊢ ((𝐹:𝐴–1-1→𝐵 ∧ ran 𝐹 ⊆ 𝐶) → 𝐹:𝐴–1-1→𝐶)
3	1, 2	sylan2 280	1 ⊢ ((𝐹:𝐴–1-1→𝐵 ∧ 𝐹:𝐴⟶𝐶) → 𝐹:𝐴–1-1→𝐶)

Syntax hints:   → wi 4   ∧ wa 102   ⊆ wss 2999  ran crn 4439  ⟶wf 5011  –1-1→wf1 5012

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106

This theorem depends on definitions:  df-bi 115  df-f 5019  df-f1 5020

This theorem is referenced by:  f1resf1  5226  inresflem  6750