This is documentation for Mathematica 8, which was
based on an earlier version of the Wolfram Language.
 BUILT-IN MATHEMATICA SYMBOL

# TraceBackward

 TraceBackwardis an option for Trace and related functions which specifies whether to include preceding expressions on the evaluation chain that contains the pattern form sought.
• TraceBackward->True includes the first expression on the evaluation chain that contains form.
• TraceBackward->All includes all expressions before form on the evaluation chain that contains form.
• TraceBackward allows you to see the previous forms that an expression had during an evaluation.
A recursive definition for finding Fibonacci numbers:
Show only what additions of positive integers are required:
Show the beginning of the evaluation chain that leads to each addition:
Show all intermediate evaluations that led to each addition:
A recursive definition for finding Fibonacci numbers:
Show only what additions of positive integers are required:
 Out[2]=
Show the beginning of the evaluation chain that leads to each addition:
 Out[3]=
Show all intermediate evaluations that led to each addition:
 Out[4]=
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