Help with definate sum closed form error

Question:Help with definate sum closed form error

Posted: Adam Ledger 360 Product: Maple

December 19 2019

Does anyone have any ideas i can try to get arround this error?

delta := proc (x, y) options operator, arrow; piecewise(x = y, 1, x <> y, 0) end proc

n-floor(n/eta)*eta+delta(n-floor(n/eta)*eta, 0)*eta = sum(m*(sum(cos(2*Pi*(n+eta-m)*(k-1)/eta)/eta, k = 1 .. eta)), m = 1 .. eta)

diff(diff(delta(x-floor(x/y)*y, 0), x), y) = diff(diff((sum(m*(sum(cos(2*Pi*(x+y-m)*(k-1)/y)/y, k = 1 .. y)), m = 1 .. y)-x+floor(x/y)*y)/y, x), y)

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