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Mirrors > Home > MPE Home > Th. List > elex | Structured version Visualization version Unicode version |
Description: If a class is a member of another class, it is a set. Theorem 6.12 of [Quine] p. 44. (Contributed by NM, 26-May-1993.) (Proof shortened by Andrew Salmon, 8-Jun-2011.) |
Ref | Expression |
---|---|
elex |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | exsimpl 1795 |
. 2
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2 | df-clel 2618 |
. 2
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3 | isset 3207 |
. 2
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4 | 1, 2, 3 | 3imtr4i 281 |
1
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