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Mirrors > Home > MPE Home > Th. List > difss | Structured version Visualization version Unicode version |
Description: Subclass relationship for class difference. Exercise 14 of [TakeutiZaring] p. 22. (Contributed by NM, 29-Apr-1994.) |
Ref | Expression |
---|---|
difss |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eldifi 3732 | . 2 | |
2 | 1 | ssriv 3607 | 1 |
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