Description: Hilbert vector space addition/subtraction law. (Contributed by NM, 2-Apr-2000) (New usage is discouraged.)
Ref | Expression | ||
---|---|---|---|
Assertion | hvsubsub4 | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | oveq1 | |
|
2 | 1 | oveq1d | |
3 | oveq1 | |
|
4 | 3 | oveq1d | |
5 | 2 4 | eqeq12d | |
6 | oveq2 | |
|
7 | 6 | oveq1d | |
8 | oveq1 | |
|
9 | 8 | oveq2d | |
10 | 7 9 | eqeq12d | |
11 | oveq1 | |
|
12 | 11 | oveq2d | |
13 | oveq2 | |
|
14 | 13 | oveq1d | |
15 | 12 14 | eqeq12d | |
16 | oveq2 | |
|
17 | 16 | oveq2d | |
18 | oveq2 | |
|
19 | 18 | oveq2d | |
20 | 17 19 | eqeq12d | |
21 | ifhvhv0 | |
|
22 | ifhvhv0 | |
|
23 | ifhvhv0 | |
|
24 | ifhvhv0 | |
|
25 | 21 22 23 24 | hvsubsub4i | |
26 | 5 10 15 20 25 | dedth4h | |