阁楼

Fourier transform, Fourier inversion

参考 瞿燕辉老师《常微分方程》讲义

线性系统的共轭，相流

常系数线性方程，非齐次方程，非自治线性方程的解形式

矩阵空间与矩阵函数、一般线性系统、相流

分裂域，正规扩张，完美域，可分扩张，单扩张，迹与范数映射

The isoperimetric inequality, Weyl's equidistribution theorem, a continuous but nowhere differentiable function, the heat equation on the circle

Mean-square convergence of Fourier series, Pointwise convergence

Orthogonality, Hilbert space