Description: Value of a sequence shifted by -u A . (Contributed by NM, 18-Aug-2005) (Revised by Mario Carneiro, 5-Nov-2013)
Ref | Expression | ||
---|---|---|---|
Hypothesis | shftfval.1 | |
|
Assertion | shftval4 | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | shftfval.1 | |
|
2 | negcl | |
|
3 | 1 | shftval | |
4 | 2 3 | sylan | |
5 | subneg | |
|
6 | 5 | ancoms | |
7 | addcom | |
|
8 | 6 7 | eqtr4d | |
9 | 8 | fveq2d | |
10 | 4 9 | eqtrd | |