- IsRealisableOverSubfield
- IsRealReflectionGroup
- IsReduced
- IsReducedIsomorphicHyperellipticCurves
- IsReductive
- IsReeGroup
- IsReflection
- IsReflectionGroup
- IsReflectionSubgroup
- IsReflexive
- IsRegular
- IsRegularLDPC
- IsRegularPlace
- IsRegularSingularOperator
- IsRegularSingularPlace
- IsRepresented
- IsResiduallyConnected
- IsResiduallyPrimitive
- IsResiduallyWeaklyPrimitive
- IsResiduallyWealyPrimitive
- IsResolution
- IsRestrictable
- IsRestricted
- IsRestrictedSubalgebra
- IsReverseLatticeWord
- IsRightIdeal
- IsRightIsomorphic
- IsRightIsomorphic(I, J) : AlgAssVOrdIdl[RngOrd], AlgAssVOrdIdl[RngOrd] -> BoolElt, AlgQuatElt
- IsLeftIsomorphic(I, J) : AlgAssVOrdIdl[RngOrd], AlgAssVOrdIdl[RngOrd] -> BoolElt, AlgQuatElt
- IsLeftIsomorphic(I, J) : AlgQuatOrdIdl, AlgQuatOrdIdl -> BoolElt, Map, AlgQuatElt
- IsRightModule
- IsRing
- IsRingHomomorphism
- IsRingOfAllModularForms
- IsRoot
- IsRootedTree
- IsRootSpace
- IsRPRI
- IsRWP
- IsRWPRI
- IsSameGenus
- IsSameType
- IsSatisfied
- IsSaturated
- IsScalar
- IsSelfDual
V2.28, 13 July 2023