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Mirrors > Home > MPE Home > Th. List > nfel | Structured version Visualization version Unicode version |
Description: Hypothesis builder for elementhood. (Contributed by NM, 1-Aug-1993.) (Revised by Mario Carneiro, 11-Aug-2016.) (Proof shortened by Wolf Lammen, 16-Nov-2019.) |
Ref | Expression |
---|---|
nfnfc.1 |
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nfeq.2 |
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Ref | Expression |
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nfel |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nfnfc.1 |
. . . 4
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2 | 1 | a1i 11 |
. . 3
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3 | nfeq.2 |
. . . 4
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4 | 3 | a1i 11 |
. . 3
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5 | 2, 4 | nfeld 2773 |
. 2
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6 | 5 | trud 1493 |
1
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