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Mirrors > Home > MPE Home > Th. List > notbid | Structured version Visualization version Unicode version |
Description: Deduction negating both sides of a logical equivalence. (Contributed by NM, 21-May-1994.) |
Ref | Expression |
---|---|
notbid.1 |
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Ref | Expression |
---|---|
notbid |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | notbid.1 |
. . 3
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2 | notnotb 304 |
. . 3
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3 | notnotb 304 |
. . 3
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4 | 1, 2, 3 | 3bitr3g 302 |
. 2
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5 | 4 | con4bid 307 |
1
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