Abstract
The free-space dyadic Green function in electromagnetics is orthogonal to its own curl on any spherical surface whose center is the source point.
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Acknowledgments
The author is grateful to the Charles Godfrey Binder Endowment at Penn State for ongoing support of his research.
Data availability statement
No new data were created or analyzed in this study.
Disclosure statement
No potential conflict of interest was reported by the author(s).