Description: An inference from three chained equalities. (Contributed by NM, 3-Aug-2006)
Ref | Expression | ||
---|---|---|---|
Hypotheses | 3eqtr2i.1 | |
|
3eqtr2i.2 | |
||
3eqtr2i.3 | |
||
Assertion | 3eqtr2i | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 3eqtr2i.1 | |
|
2 | 3eqtr2i.2 | |
|
3 | 3eqtr2i.3 | |
|
4 | 1 2 | eqtr4i | |
5 | 4 3 | eqtri | |