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Mirrors > Home > MPE Home > Th. List > ianor | Unicode version |
Description: Negated conjunction in terms of disjunction (De Morgan's law). Theorem *4.51 of [WhiteheadRussell] p. 120. (Contributed by NM, 14-May-1993.) (Proof shortened by Andrew Salmon, 13-May-2011.) |
Ref | Expression |
---|---|
ianor |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | imnan 422 | . 2 | |
2 | pm4.62 419 | . 2 | |
3 | 1, 2 | bitr3i 251 | 1 |
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