I am reading "Mathematics and Algorithms" as part of the Wolfram Tutorial series.
In "Values for symbols" section of the "Algebraic Calculations" chapter it is described that
=. can be used to clear the contents of a variable.
I am struggling to be able to understand in which cases this is applicable.
For example, I have a notebook which I have been using for several tests and specifically I can not clear the value of x.
In x Out Removed[t] In x=. Out In x Out Removed[t]
x is not being cleared?