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Mirrors > Home > MPE Home > Th. List > nffv | Structured version Visualization version GIF version |
Description: Bound-variable hypothesis builder for function value. (Contributed by NM, 14-Nov-1995.) (Revised by Mario Carneiro, 15-Oct-2016.) |
Ref | Expression |
---|---|
nffv.1 | ⊢ Ⅎ𝑥𝐹 |
nffv.2 | ⊢ Ⅎ𝑥𝐴 |
Ref | Expression |
---|---|
nffv | ⊢ Ⅎ𝑥(𝐹‘𝐴) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-fv 6445 | . 2 ⊢ (𝐹‘𝐴) = (℩𝑦𝐴𝐹𝑦) | |
2 | nffv.2 | . . . 4 ⊢ Ⅎ𝑥𝐴 | |
3 | nffv.1 | . . . 4 ⊢ Ⅎ𝑥𝐹 | |
4 | nfcv 2908 | . . . 4 ⊢ Ⅎ𝑥𝑦 | |
5 | 2, 3, 4 | nfbr 5122 | . . 3 ⊢ Ⅎ𝑥 𝐴𝐹𝑦 |
6 | 5 | nfiotaw 6399 | . 2 ⊢ Ⅎ𝑥(℩𝑦𝐴𝐹𝑦) |
7 | 1, 6 | nfcxfr 2906 | 1 ⊢ Ⅎ𝑥(𝐹‘𝐴) |
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