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Radial functions of point and line source undefined at DC #9

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trettberg opened this issue Dec 1, 2017 · 0 comments
Open

Radial functions of point and line source undefined at DC #9

trettberg opened this issue Dec 1, 2017 · 0 comments

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@trettberg
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The monopoles use an expression like hn(k*rs) * bn(k*r), which exist as a limit k->0 but is undefined for k==0. Consequently spherical_ps and circular_ls yield NaN for k==0.

The DC case must be handled separately.
Hopefully, a closed-form expression for the limit can be found.
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