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Mathematica > Core Language > Defining Variables and Functions > Assignments > Unset (=.) >

BUILT-IN MATHEMATICA SYMBOL

Unset

lhs=.
removes any rules defined for lhs.

Rules are removed only when their left-hand sides are identical to lhs, up to renaming of patterns.

Undefine a value:

Undefine a function:

Undefine a value:

Out[3]=

Undefine a function:

Clear values of variables:

Clear functions (downvalues):

Use

to clear definitions with a particular left-hand side:

Clear all definitions:

To clear an upvalue, the tag has to be given:

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