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Mirrors > Home > MPE Home > Th. List > fvmpt | Structured version Visualization version GIF version |
Description: Value of a function given in maps-to notation. (Contributed by NM, 17-Aug-2011.) |
Ref | Expression |
---|---|
fvmptg.1 | ⊢ (𝑥 = 𝐴 → 𝐵 = 𝐶) |
fvmptg.2 | ⊢ 𝐹 = (𝑥 ∈ 𝐷 ↦ 𝐵) |
fvmpt.3 | ⊢ 𝐶 ∈ V |
Ref | Expression |
---|---|
fvmpt | ⊢ (𝐴 ∈ 𝐷 → (𝐹‘𝐴) = 𝐶) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | fvmpt.3 | . 2 ⊢ 𝐶 ∈ V | |
2 | fvmptg.1 | . . 3 ⊢ (𝑥 = 𝐴 → 𝐵 = 𝐶) | |
3 | fvmptg.2 | . . 3 ⊢ 𝐹 = (𝑥 ∈ 𝐷 ↦ 𝐵) | |
4 | 2, 3 | fvmptg 6855 | . 2 ⊢ ((𝐴 ∈ 𝐷 ∧ 𝐶 ∈ V) → (𝐹‘𝐴) = 𝐶) |
5 | 1, 4 | mpan2 687 | 1 ⊢ (𝐴 ∈ 𝐷 → (𝐹‘𝐴) = 𝐶) |
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