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| Mirrors > Home > MPE Home > Th. List > biantrurd | Structured version Visualization version Unicode version | ||
| Description: A wff is equivalent to its conjunction with truth. (Contributed by NM, 1-May-1995.) (Proof shortened by Andrew Salmon, 7-May-2011.) |
| Ref | Expression |
|---|---|
| biantrud.1 |
|
| Ref | Expression |
|---|---|
| biantrurd |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | biantrud.1 |
. 2
| |
| 2 | ibar 525 |
. 2
| |
| 3 | 1, 2 | syl 17 |
1
|
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