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Mirrors > Home > MPE Home > Th. List > ssun2 | Structured version Visualization version Unicode version |
Description: Subclass relationship for union of classes. (Contributed by NM, 30-Aug-1993.) |
Ref | Expression |
---|---|
ssun2 |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ssun1 3597 |
. 2
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2 | uncom 3578 |
. 2
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3 | 1, 2 | sseqtri 3464 |
1
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