�ber die reellen L�sungen der Gleichung $$\frac{{\partial ^2 u}}{{\partial x^2 }} + \frac{{\partial ^2 u}}{{\partial y^2 }} = 0.$$
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چکیده
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ژورنال
عنوان ژورنال: Mathematische Annalen
سال: 1908
ISSN: 0025-5831,1432-1807
DOI: 10.1007/bf01450692