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Mirrors > Home > MPE Home > Th. List > ssun1 | Structured version Visualization version Unicode version |
Description: Subclass relationship for union of classes. Theorem 25 of [Suppes] p. 27. (Contributed by NM, 5-Aug-1993.) |
Ref | Expression |
---|---|
ssun1 |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | orc 400 |
. . 3
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2 | elun 3753 |
. . 3
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3 | 1, 2 | sylibr 224 |
. 2
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4 | 3 | ssriv 3607 |
1
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