 The Dombi t-norm formula_30 for 0 < "p" < +∞ arises from the Hamacher product t-norm by raising its additive generator to the power of "p".An additive generator of formula_30 for 0 < "p" < +∞ is

The family of "Sugeno–Weber t-norms" was introduced in the early 1980s by Siegfried Weber; the dual t-conorms were defined already in the early 1970s by Michio Sugeno.It is given for −1 ≤ "p" ≤ +∞ by

The Sugeno–Weber t-norm formula_35 is nilpotent if and only if −1 < "p" < +∞ (for "p" = 0 it is the Łukasiewicz t-norm).