Constant
 Usage
• Constant 是一个属性，指明一个符号相对于所有参数导数为零。
Notes
• Constant 由Dt使用。 • 如果 f 有属性 Constant，函数 f[ ... ]取为全导数为零。 •诸如Pi的数学常数有属性Constant。
 Further Examples
The variable c is not a constant.
In[1]:=
|
Out[1]=
|
The makes c a constant under differentiation.
In[2]:=
|
The makes c a constant under differentiation.
In[3]:=
|
Out[3]=
|
Now c is no longer a constant under differentiation.
In[4]:=
|
In[5]:=
|
Out[5]=
|
| 
