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Mirrors > Home > MPE Home > Th. List > nfmpt1 | Structured version Visualization version GIF version |
Description: Bound-variable hypothesis builder for the maps-to notation. (Contributed by FL, 17-Feb-2008.) |
Ref | Expression |
---|---|
nfmpt1 | ⊢ Ⅎ𝑥(𝑥 ∈ 𝐴 ↦ 𝐵) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-mpt 5159 | . 2 ⊢ (𝑥 ∈ 𝐴 ↦ 𝐵) = {〈𝑥, 𝑧〉 ∣ (𝑥 ∈ 𝐴 ∧ 𝑧 = 𝐵)} | |
2 | nfopab1 5145 | . 2 ⊢ Ⅎ𝑥{〈𝑥, 𝑧〉 ∣ (𝑥 ∈ 𝐴 ∧ 𝑧 = 𝐵)} | |
3 | 1, 2 | nfcxfr 2906 | 1 ⊢ Ⅎ𝑥(𝑥 ∈ 𝐴 ↦ 𝐵) |
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