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enough to be given a name.
* For any fuzzy set the concentration is defined
::Taking , we have and

* Given fuzzy sets , the fuzzy set difference , also denoted , may be defined straightforwardly via the membership function:
::
:which means , e. g.:
::

:Another proposal for a set difference could be:
::

* Proposals for symmetric fuzzy set differences have been made by Dubois and Prade (1980), either by taking the absolute value,

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