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本文证明了能够产生半平面对称度规的电磁场可以是平面对称的,也可以是半平面对称的。其中的平面对称电磁场一定是非类光电磁场,而半平面对称电磁场则可能是类光的,也可能是非类光的。求出由半平面对称类光(null)无源电磁场所产生的半平面对称时空通解。It is shown in this paper that the electromagnetic field yielding a semi-plane-symnmetric metric can be either plane-symmetric or semi-plane-symmetric. If it is plane-symmetric, then it must be a non-null electromagnetic field, while if it is semi-plane-symmetric, then it can be either null or non-null. The general solution of semi-plane-symmetric spacetimes yielded by semi-plane-symmetric sourceless null electromagnetic field is also given in this paper.
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