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Mirrors > Home > MPE Home > Th. List > nsyl | Structured version Visualization version Unicode version |
Description: A negated syllogism inference. (Contributed by NM, 31-Dec-1993.) (Proof shortened by Wolf Lammen, 2-Mar-2013.) |
Ref | Expression |
---|---|
nsyl.1 | |
nsyl.2 |
Ref | Expression |
---|---|
nsyl |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nsyl.1 | . . 3 | |
2 | nsyl.2 | . . 3 | |
3 | 1, 2 | nsyl3 133 | . 2 |
4 | 3 | con2i 134 | 1 |
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