Trace

Trace[expr] traces the evaluation of expr.

Attributes[Trace] := {HoldAll, Protected}

Simple examples

In[1]:= Trace[1 + 2]
Out[1]= {1 + 2, 3}

In[2]:= Trace[(1 + 3) + 2]
Out[2]= {{1 + 3, 4}, 4 + 2, 6}

In[3]:= Trace[2 + (1 + 3)]
Out[3]= {{1 + 3, 4}, 2 + 4, 6}