Description: An inference from three chained equalities. (Contributed by NM, 26-May-1993) (Proof shortened by Andrew Salmon, 25-May-2011)
Ref | Expression | ||
---|---|---|---|
Hypotheses | 3eqtr4i.1 | |
|
3eqtr4i.2 | |
||
3eqtr4i.3 | |
||
Assertion | 3eqtr4i | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 3eqtr4i.1 | |
|
2 | 3eqtr4i.2 | |
|
3 | 3eqtr4i.3 | |
|
4 | 3 1 | eqtr4i | |
5 | 2 4 | eqtr4i | |