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| Mirrors > Home > ILE Home > Th. List > eqeltrd | Unicode version | ||
| Description: Substitution of equal classes into membership relation, deduction form. (Contributed by Raph Levien, 10-Dec-2002.) | 
| Ref | Expression | 
|---|---|
| eqeltrd.1 | 
 | 
| eqeltrd.2 | 
 | 
| Ref | Expression | 
|---|---|
| eqeltrd | 
 | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | eqeltrd.2 | 
. 2
 | |
| 2 | eqeltrd.1 | 
. . 3
 | |
| 3 | 2 | eleq1d 2265 | 
. 2
 | 
| 4 | 1, 3 | mpbird 167 | 
1
 | 
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