斜微商 meaning in English

oblique derivative

The oblique derivative problem for nonlinear ellipticequations of second order
二阶非线性椭圆型方程的斜微商问题
An oblique derivative problem for degenerate hyperbolic equation of second order
一类退化型的二阶双曲方程的斜微商边值问题
Oblique derivative problems for quasilinear degenerate elliptic equations of second order
二阶拟线性退化椭圆型方程的斜微商问题
The oblique derivative problem for hyperbolic equations of second order in general domains
二阶双曲型方程在一般区域上的斜微商问题
Center discontinuous oblique derivative problems for quasilinear mixed equations of second order
二阶拟线性混合型方程的间断斜微商问题

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