Description: Sum of exponents law for exponential function. (Contributed by NM, 10-Jan-2006) (Proof shortened by Mario Carneiro, 29-Apr-2014)
Ref | Expression | ||
---|---|---|---|
Assertion | efadd | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqid | |
|
2 | eqid | |
|
3 | eqid | |
|
4 | simpl | |
|
5 | simpr | |
|
6 | 1 2 3 4 5 | efaddlem | |