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Mirrors > Home > MPE Home > Th. List > difssd | Structured version Visualization version Unicode version |
Description: A difference of two classes is contained in the minuend. Deduction form of difss 3737. (Contributed by David Moews, 1-May-2017.) |
Ref | Expression |
---|---|
difssd |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | difss 3737 |
. 2
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2 | 1 | a1i 11 |
1
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