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Mirrors > Home > MPE Home > Th. List > elexi | Structured version Visualization version Unicode version |
Description: If a class is a member of another class, it is a set. (Contributed by NM, 11-Jun-1994.) |
Ref | Expression |
---|---|
elexi.1 |
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Ref | Expression |
---|---|
elexi |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elexi.1 |
. 2
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2 | elex 3212 |
. 2
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3 | 1, 2 | ax-mp 5 |
1
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