包括：

列主元Gauss消去法解线性方程组；

矩阵的LDLT和Cholesky分解；

追赶法解三对角方程组；

Jacobi和Gauss-Seidel方法解方程组；

Newton插值多项式和三次样条插值多项式；

复化Simpson公式求解定积分；

Romberg方法求解定积分；

二分法和割线法求非线性方程的解。-Include:

Main-element Gauss elimination method for solving linear equations

Matrix LDLT and Cholesky decomposition

The catch-up method for solving tridiagonal equations

Jacobi and Gauss-Seidel method for solving equations

Newton interpolation polynomial and cubic spline interpolation polynomial

Complexification Simpson formula for solving the definite integral

Romberg method for solving the definite integral

The dichotomy and secant seeking nonlinear equation.