More on the Kronecker Delta and Fourier Series

Posted on April 17, 2011April 17, 2011 by Adrian McMenamin

Modified my spreadsheet to sum the integral. So here is $\int_{-\pi}^{\pi}sin(mx)sin(ny)$ and $sin(mx)sin(nx)$ with $m = n$ . (Integral is the dark orange line)

And for $n = 5m$

And for $n = 2.1m$ :

integ21 — sin(x)sin(y) with integral where y = 2.1x

So, it’s pretty clear $\delta_{mn}$ (the Kronecker delta) applies when both $m$ and $n$ are integers.

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