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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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