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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 |
|
| Ref | Expression |
|---|---|
| notbid |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | notbid.1 |
. . 3
| |
| 2 | notnotb 304 |
. . 3
| |
| 3 | notnotb 304 |
. . 3
| |
| 4 | 1, 2, 3 | 3bitr3g 302 |
. 2
|
| 5 | 4 | con4bid 307 |
1
|
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