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A*Uxx+2*B*Uxy+C*Uyy+D*Ux+E*Uy+F*U=0 其特征方程为 A*(dy)^2-2*B*dx*dy+C*(dx)^2=0 若在某域内B^2-A*C0则在此域内称为双曲形方程 如此,一阶偏微的A=B=C=0,则B^2-A*C=0,一阶偏微必为抛物型? 扫码下载作业帮搜索答疑一搜即得 答案解析 查看更多优质解析 解答一 举报 抛物...
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区分偏微分符号dx ,Ux 和partial(U) / partial(x)这三个符号的区别partial就是把e翻转180°的那个符号,学数学物理方程总把这三个弄混了,主要是因为二阶偏微分方程的一般形式为A*Uxx+2*B*Uxy+C*Uyy+D*Ux+E*U
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partial就是把e翻转180°的那个符号,学数学物理方程总把这三个弄混了,主要是因为二阶偏微分方程的一般形式为A*Uxx+2*B*Uxy+C*Uyy+D*Ux+E*Uy+F*U=0其特征方程为A*(dy)^2-2*B*dx*dy+C*(dx)^2=0, 扫码下载作业帮搜索答疑一搜即得 答案解析 查看更多优质解析 解答一 举报 dx表示x的微分,也就是...