范围(40) 推广和延伸(1) 选项(1) 应用(11) 属性和关系(9) 可能存在的问题(5) 巧妙范例(1)
解一个差分方程: In[1]:=1 https://wolfram.com/xid/0cg493ube-lb5zc Direct link to example Out[1]=1 获得在一个点的解的值: Copy to clipboard.In[1]:=1✖https://wolfram.com/xid/0cg493ube-d62sh2Direct link to example Out[1]=1 值的列表: Copy to clipboard.In[2]:=2✖https:...
If you’ve ever had a math assignment requiring you to plot graphs for complex equations, then you know how difficult it is. Thankfully, you can use a graphing calculator to speed things up. This device is more powerful than a basic calculator, allowing you to process multiple equations, p...
初级代数课程讲述了如何通过使用基本算术分立变量来求解线性方程。新函数AddSides、SubtractSides、MultiplySides和DivideSides使得这些基本操作变得很容易。以下通过求解方程组 , 来说明这一点。 Copy to clipboard. In[1]:= 将第二个方程的两边乘以 2。
(in the sense that its partial derivatives all exist), but the converse is not true in general: the complex derivative only exists if the real derivative is complex linear and this imposes relations between the partial derivatives called the Cauchy–Riemann equations – see holomorphic functions. ...
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Overview Finite Element Method Options for Stationary Partial Differential Equations Overview If you have never used the finite element method implemented in the Wolfram Language, this tutorial is probably not a good starting place. To get an overview of the finite element method, a first reading sh...
"Recent Progress in Extrapolation Methods for Ordinary Differential Equations." SIAM Rev. 27 (1985): 505–535. [DN87] Deuflhard, P. and U. Nowak. "Extrapolation Integrators for Quasilinear Implicit ODEs." In Large-Scale Scientific Computing. Birkhäuser, 1987. [DS93] Duff, I. S. and ...
Wolfram Alpha was wrong, and my proof was correct. We indeed have ∏n=2∞(1−n(−1)n)=0 as k=2∑nln(1−k(−1)k)=−21ln(n)+O(1) ... Sum of a rearranged alternating harmonic series, with three positive terms followed by one negative term https://math.stackexchange.com...
"Recent Progress in Extrapolation Methods for Ordinary Differential Equations." SIAM Rev. 27 (1985): 505–535. [DN87] Deuflhard, P. and U. Nowak. "Extrapolation Integrators for Quasilinear Implicit ODEs." In Large-Scale Scientific Computing. Birkhäuser, 1987....