Description: The square of a norm. (Contributed by NM, 12-May-2005) (New usage is discouraged.)
Ref | Expression | ||
---|---|---|---|
Assertion | normsq | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | fveq2 | |
|
2 | 1 | oveq1d | |
3 | id | |
|
4 | 3 3 | oveq12d | |
5 | 2 4 | eqeq12d | |
6 | ifhvhv0 | |
|
7 | 6 | normsqi | |
8 | 5 7 | dedth | |