Description: Commute RHS addition, in deduction form. (Contributed by David A. Wheeler, 11-Oct-2018)
Ref | Expression | ||
---|---|---|---|
Hypotheses | comraddd.1 | |
|
comraddd.2 | |
||
comraddd.3 | |
||
Assertion | comraddd | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | comraddd.1 | |
|
2 | comraddd.2 | |
|
3 | comraddd.3 | |
|
4 | 1 2 | addcomd | |
5 | 3 4 | eqtrd | |