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Mirrors > Home > MPE Home > Th. List > elssuni | Structured version Visualization version Unicode version |
Description: An element of a class is a subclass of its union. Theorem 8.6 of [Quine] p. 54. Also the basis for Proposition 7.20 of [TakeutiZaring] p. 40. (Contributed by NM, 6-Jun-1994.) |
Ref | Expression |
---|---|
elssuni |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ssid 3463 |
. 2
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2 | ssuni 4234 |
. 2
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3 | 1, 2 | mpan 681 |
1
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