Description: Relationship between subtraction and addition. (Contributed by Scott Fenton, 5-Jul-2013) (Proof shortened by Mario Carneiro, 27-May-2016)
Ref | Expression | ||
---|---|---|---|
Assertion | subadd2 | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | subadd | |
|
2 | simp2 | |
|
3 | simp3 | |
|
4 | 2 3 | addcomd | |
5 | 4 | eqeq1d | |
6 | 1 5 | bitrd | |