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| Mirrors > Home > ILE Home > Th. List > ffvelcdmd | GIF version | ||
| Description: A function's value belongs to its codomain. (Contributed by Mario Carneiro, 29-Dec-2016.) | 
| Ref | Expression | 
|---|---|
| ffvelcdmd.1 | ⊢ (𝜑 → 𝐹:𝐴⟶𝐵) | 
| ffvelcdmd.2 | ⊢ (𝜑 → 𝐶 ∈ 𝐴) | 
| Ref | Expression | 
|---|---|
| ffvelcdmd | ⊢ (𝜑 → (𝐹‘𝐶) ∈ 𝐵) | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | ffvelcdmd.2 | . 2 ⊢ (𝜑 → 𝐶 ∈ 𝐴) | |
| 2 | ffvelcdmd.1 | . . 3 ⊢ (𝜑 → 𝐹:𝐴⟶𝐵) | |
| 3 | 2 | ffvelcdmda 5697 | . 2 ⊢ ((𝜑 ∧ 𝐶 ∈ 𝐴) → (𝐹‘𝐶) ∈ 𝐵) | 
| 4 | 1, 3 | mpdan 421 | 1 ⊢ (𝜑 → (𝐹‘𝐶) ∈ 𝐵) | 
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