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Mirrors > Home > MPE Home > Th. List > nfra1 | Structured version Visualization version Unicode version |
Description: The setvar is not free in . (Contributed by NM, 18-Oct-1996.) (Revised by Mario Carneiro, 7-Oct-2016.) |
Ref | Expression |
---|---|
nfra1 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-ral 2917 | . 2 | |
2 | nfa1 2028 | . 2 | |
3 | 1, 2 | nfxfr 1779 | 1 |
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