A generic membership functions has the form [x1, x2] --> [y1, y2], where x1,
x2, y1 and y2 are real numbers in most of the cases. I am interested in
those particular cases where the axis of the membership function are not
crisp but fuzzy (for example: if [x1, x2] or [y1, y2] are fuzzy intervals or
if their elements are fuzzy numbers).
I would appreciate if you point out any publication regarding the
mathematical treatement of this kind of membership functions defined in
terms of fuzzy elements.
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