Further Examples: Block

Here is an expression involving s.

In[1]:=

This evaluates the previous expression, using a local value for s.

In[2]:=

Out[2]=

There is no global value for s.

In[3]:=

Out[3]=

Attempting to evaluate this sum directly does not work.

In[4]:=

Out[4]=

This works.

In[5]:=

In[6]:=

Out[6]=

In[7]:=