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Acknowledgments
The authors would particularly like to thank Professor T H R Skyrme for the solution
of the differential equation and other members of the Department of Mathematical
Physics for many useful and illuminating discussions, especially Dr R K Zia and Dr J G
Williams. They would also like to thank Professor P C Martin of Harvard University
for drawing their attention to the work of Berezinskii, and for a helpful discussion.
(引用終り)

Kosterlitz, J. M. Thouless, D. J.たち
the solution of the differential equation
教えて貰ったんだ（＾＾；

それが院試などと違うところ
試験外では、教えて貰って良い（自分で解けるのが良だが）
（おしえてもらえるのは試験通ってからだろうが）