### 3.7.82. Disequality

Denotes the fact that a disequality between two domain variables, one domain variable and a fixed value, or two set variables is used within the definition of a constraint. Denotes also the fact that the notion of disequality can be used within the informal definition of a constraint. This is for instance the case for the relaxation of the $\mathrm{𝚊𝚕𝚕𝚍𝚒𝚏𝚏𝚎𝚛𝚎𝚗𝚝}$ constraint (i.e.,  $\mathrm{𝚜𝚘𝚏𝚝}_\mathrm{𝚊𝚕𝚕𝚍𝚒𝚏𝚏𝚎𝚛𝚎𝚗𝚝}_\mathrm{𝚌𝚝𝚛}$, $\mathrm{𝚜𝚘𝚏𝚝}_\mathrm{𝚊𝚕𝚕𝚍𝚒𝚏𝚏𝚎𝚛𝚎𝚗𝚝}_\mathrm{𝚟𝚊𝚛}$), which do not strictly enforce a disequality.