亚调和函数：平均通量定理，逆定理及相关性质
Metaharmonic functions: mean flux theorem, its converse and related properties
摘要：
证明了Helmholtz方程及其修正形式解的平均通量定理。此外，他们的逆被认为是与其他一些属性概括那些保证调和。
英文摘要：
The mean flux theorems are proved for solutions of the Helmholtz equation and its modified version. Also, their converses are considered along with some other properties which generalise those that guarantee harmonicity.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
