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Mirrors > Home > MPE Home > Th. List > un0 | Structured version Visualization version Unicode version |
Description: The union of a class with the empty set is itself. Theorem 24 of [Suppes] p. 27. (Contributed by NM, 15-Jul-1993.) |
Ref | Expression |
---|---|
un0 |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | noel 3735 |
. . . 4
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2 | 1 | biorfi 409 |
. . 3
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3 | 2 | bicomi 206 |
. 2
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4 | 3 | uneqri 3576 |
1
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