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| Mirrors > Home > ILE Home > Th. List > csbeq1a | Unicode version | ||
| Description: Equality theorem for proper substitution into a class. (Contributed by NM, 10-Nov-2005.) | 
| Ref | Expression | 
|---|---|
| csbeq1a | 
 | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | csbid 3092 | 
. 2
 | |
| 2 | csbeq1 3087 | 
. 2
 | |
| 3 | 1, 2 | eqtr3id 2243 | 
1
 | 
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