Description: 0 is a right identity for extended real addition. (Contributed by Glauco Siliprandi, 17-Aug-2020)
Ref | Expression | ||
---|---|---|---|
Hypothesis | xaddid1d.1 | |
|
Assertion | xaddid1d | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | xaddid1d.1 | |
|
2 | xaddid1 | |
|
3 | 1 2 | syl | |