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| Mirrors > Home > ILE Home > Th. List > eqbrtrd | Unicode version | ||
| Description: Substitution of equal classes into a binary relation. (Contributed by NM, 8-Oct-1999.) | 
| Ref | Expression | 
|---|---|
| eqbrtrd.1 | 
 | 
| eqbrtrd.2 | 
 | 
| Ref | Expression | 
|---|---|
| eqbrtrd | 
 | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | eqbrtrd.2 | 
. 2
 | |
| 2 | eqbrtrd.1 | 
. . 3
 | |
| 3 | 2 | breq1d 4043 | 
. 2
 | 
| 4 | 1, 3 | mpbird 167 | 
1
 | 
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