Description: An equality transitivity deduction. (Contributed by NM, 21-Jun-1993)
Ref | Expression | ||
---|---|---|---|
Hypotheses | eqtrid.1 | |
|
eqtrid.2 | |
||
Assertion | eqtrid | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqtrid.1 | |
|
2 | eqtrid.2 | |
|
3 | 1 | a1i | |
4 | 3 2 | eqtrd | |