1. The rule is dictatorial, i.e. there exists a distinguished voter who can choose the winner; or
2. The rule limits the possible outcomes to two alternatives only; or
3. The rule is susceptible to tactical voting: in certain conditions some voter's sincere ballot may not defend their opinion best.

Casus belli

Йодид

Ламинария сахаристая

Интервальная арифметика

Идея порога различия

Функция полезности

Наука принятия решений

Метод Шульце

Парадокс Кондорсе