Σ Calculations
Function that, for a specified range of f(x), determines sum
(f(x)) = f(a) + f(a + 1) + f(a + 2) + ⋯ + f(b).
Natural Display input syntax is (f(x)), while Linear Display input syntax is ∑(f(x); a; b).
a and b are integers that can be specified within the range of -1 × 1010 < a ≦ b < 1 × 1010.
Example: 
(x + 1) = 20
(MthIO-MathO)
(
)
(X)
1
15
- 20
(LineIO)
- ()(X)1(;) 1(;) 5
- 20
Note
The following cannot be used in f(x): Pol, Rec, ÷R. The following cannot be used in f(x), a, or b: ∫, d/dx, Σ.
