Description: Two ways to express the negative of a vector. (Contributed by NM, 31-Oct-1999) (New usage is discouraged.)
Ref | Expression | ||
---|---|---|---|
Hypothesis | hvaddid2.1 | |
|
Assertion | hv2negi | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | hvaddid2.1 | |
|
2 | hv2neg | |
|
3 | 1 2 | ax-mp | |