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Mirrors > Home > MPE Home > Th. List > fvresi | Structured version Visualization version GIF version |
Description: The value of a restricted identity function. (Contributed by NM, 19-May-2004.) |
Ref | Expression |
---|---|
fvresi | ⊢ (𝐵 ∈ 𝐴 → (( I ↾ 𝐴)‘𝐵) = 𝐵) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | fvres 6775 | . 2 ⊢ (𝐵 ∈ 𝐴 → (( I ↾ 𝐴)‘𝐵) = ( I ‘𝐵)) | |
2 | fvi 6826 | . 2 ⊢ (𝐵 ∈ 𝐴 → ( I ‘𝐵) = 𝐵) | |
3 | 1, 2 | eqtrd 2778 | 1 ⊢ (𝐵 ∈ 𝐴 → (( I ↾ 𝐴)‘𝐵) = 𝐵) |
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