hálfgrúpa
Icelandic edit
Etymology edit
From hálf- (“half-”) + grúpa (“group”).
Noun edit
hálfgrúpa f (genitive singular hálfgrúpu, nominative plural hálfgrúpur)
- (mathematics) a semigroup; (any set for which there is a binary operation that is both closed and associative)
Declension edit
declension of hálfgrúpa
| f-w1 | singular | plural | ||
|---|---|---|---|---|
| indefinite | definite | indefinite | definite | |
| nominative | hálfgrúpa | hálfgrúpan | hálfgrúpur | hálfgrúpurnar |
| accusative | hálfgrúpu | hálfgrúpuna | hálfgrúpur | hálfgrúpurnar |
| dative | hálfgrúpu | hálfgrúpunni | hálfgrúpum | hálfgrúpunum |
| genitive | hálfgrúpu | hálfgrúpunnar | hálfgrúpa | hálfgrúpanna |
Derived terms edit
- styttin hálfgrúpa (“cancellation semigroup”)
- hálfgrúpumótun (“semigroup homomorphism”)
- hálfgrúpa með hlutleysu (“semigroup with identity element, monoid”)