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| Mirrors > Home > MPE Home > Th. List > 3brtr4d | Structured version Visualization version Unicode version | ||
| Description: Substitution of equality into both sides of a binary relation. (Contributed by NM, 21-Feb-2005.) |
| Ref | Expression |
|---|---|
| 3brtr4d.1 |
|
| 3brtr4d.2 |
|
| 3brtr4d.3 |
|
| Ref | Expression |
|---|---|
| 3brtr4d |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 3brtr4d.1 |
. 2
| |
| 2 | 3brtr4d.2 |
. . 3
| |
| 3 | 3brtr4d.3 |
. . 3
| |
| 4 | 2, 3 | breq12d 4666 |
. 2
|
| 5 | 1, 4 | mpbird 247 |
1
|
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