1. The residue, remainder or rest of something
  2. The solid material remaining after the liquid in which it was dissolved has been evaporated; a residue.
  3. A binary function from 1 × 2 to 3 which is defined in terms of the t-norm as follows: <math> x \rightarrow y = \sup \{ z | z * x \leqslant y\}</math>, where <math>*</math> denotes the t-norm function and <math>\sup</math> denotes the supremum.
    The residuum of the minimum t-norm is a function <math>\rightarrow</math> such that <math> x \rightarrow y = \begin{cases} y, & \text{if } x > y \\ 1, & \text{if } x \leqslant y .\end{cases}</math>
  4. The residue of an estate

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