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1)  linear degradation
退化直线
2)  Linear degeneracy
线性退化
3)  degenerated curve
退化曲线
4)  degenerate segment
退化线段
5)  weakly linearly degenerate
弱线性退化
1.
It is proved that under the condition that normalized coordinates exist the system must be weakly linearly degenerate if the Cauchy problem for general quasilinear hyperbolic systems with characteristics with constant multiplicity with arbitrary small C 1 initial data always admits a unique global C 1 solution u=u(t,x) on t≥0.
对具常重特征的拟线性双曲组 ,在正规化坐标存在的假设下 ,证明了若其Chauchy问题对任意小C1初值总有整体C1解 ,则方程组必为弱线性退化 。
6)  parabolic degeneracy
抛物退化线
1.
Complex equations of mixed (elliptic-hyperbolic) type with parabolic degeneracy;
带抛物退化线的混合(椭圆-双曲)型方程(英文)
2.
The Tricomi problem of second order equations of mixed type in a special domain was posed and discussed by previous authors,The present paper deals with the discontinuous Riemann-Hilbert problem for first order complex equations of mixed(elliptic-hyperbolic) type with parabolic degeneracy.
本文讨论带抛物退化线的一阶混合型(椭圆 双曲)型复方程的间断Riemann Hilbert边值问题。
3.
The paper deals with the discontinuous oblique derivative problems for second order linear equations of mixed (elliptic-hyperbolic) type with parabolic degeneracy,which include the discontinuous Tricomi problem for Chaplygin equation as a special case.
讨论了带抛物退化线的二阶混合型(椭圆-双曲型)方程的间断斜微商边值问题。
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