Ka taea hoki te whakaatu i ngā rōpū o te tikanga p2 ki te kia abelian, he tauākī e kore e generalize ki te tikanga p3, rite te rōpū kore-abelian D4 o te tikanga 8 = 23 whakaatu i runga ake. Ka taea te whakamahi i ngā pūnaha taurangi rorohiko ki te rārangi rōpū iti, engari kahore he whakarōpūtanga o ngā rōpū mutunga katoa. He taahiraa takawaenga ko te whakarōpūtanga o ngā rōpū mutunga. Ka kiia he rōpū nriviontal ohie ki te anake ona subgroups ko te rōpū trivial me te rōpū moonstrand.
whakarōpūtanga katoa