Further Examples: Operate

Here is an expression.

In[1]:=

Here the head of A is replaced by B.

In[2]:=

Out[2]=

In[3]:=

Out[3]=

Here B is applied to the head of A.

In[4]:=

Out[4]=

This is the same as applying B at level 1 in the head of A.

In[5]:=

Out[5]=

Here B is applied to the head of the head.

In[6]:=

Out[6]=

In[7]:=