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I can not clear this variable. How to clear?

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To clear Mathematica variables that are not symbols you set them equal to .

Subscript[\[Sigma], \[Epsilon]] =.

This will clear it.

Don't use subscripts. Mathematica does not not handle them very well and in general they cause nothing but problems.

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  • $\begingroup$ Thank you very much! $\endgroup$
    – Takemi
    Commented Jul 19, 2021 at 0:06

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