A proof of the theorem: $\frac{{\partial ^2 u}} {{\partial x\partial y}} = \frac{{\partial ^2 u}} {{\partial y\partial x}}$
Whittemore, J. K.
Bull. Amer. Math. Soc., Tome 4 (1898) no. 8, p. 389-390 / Harvested from Project Euclid
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Publié le : 1898-05-14
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@article{1183415366,
     author = {Whittemore, J. K.},
     title = {A proof of the theorem: $\frac{{\partial ^2 u}}
{{\partial x\partial y}} = \frac{{\partial ^2 u}}
{{\partial y\partial x}}$},
     journal = {Bull. Amer. Math. Soc.},
     volume = {4},
     number = {8},
     year = {1898},
     pages = { 389-390},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1183415366}
}

Whittemore, J. K. A proof of the theorem: $\frac{{\partial ^2 u}}
{{\partial x\partial y}} = \frac{{\partial ^2 u}}
{{\partial y\partial x}}$. Bull. Amer. Math. Soc., Tome 4 (1898) no. 8, pp.  389-390. http://gdmltest.u-ga.fr/item/1183415366/