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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 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ssun1 3776 | . 2 | |
2 | uncom 3757 | . 2 | |
3 | 1, 2 | sseqtri 3637 | 1 |
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