How to enter an equation with a summation?

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Md.
Md. am 4 Jun. 2014
Bearbeitet: Roger Wohlwend am 4 Jun. 2014
I want to enter an equation
Vij = (1/(2*π*ϵ)) ∑ ln(Djk/Dik) where the summation is from k=1 to n
K is the counter, i and j are variables that I will choose later on.
I want the equation to write itself in full form after I define n and the variable names. The result will not be an integer. As I have not defined the values for the D variables yet.

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Roger Wohlwend
Roger Wohlwend am 4 Jun. 2014
Bearbeitet: Roger Wohlwend am 4 Jun. 2014
V(i,j) = sum(log(D(i,:)./D(j,:))) / (2*pi*e)

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