interval of inedterminacyinterval of integrationinterval of ratio measurementinterval of variationinterval or scaleinterval scaleinterval subsetintervalicinterviewerinterviewer biasintointo mappingintraintra blockintra block effectsintra class correlationintraclassintraclusterintracluster correlationintransitiveintransitive groupintransitive permutationintransitive relationintrinsicintrinsic equationintrinsic equationsintrinsic equations of a space curveintrinsic geometryintrinsic propertiesintrinsic properties of a curveintroduceintroductionintroductoryintuitionintuitionalismintuitionastic mathematicsintuitionismintuitionisticintuitionistic logicintuitionistic mathematicsintuitiveintuitive principle of abstractionintuitivelyinvalidinvalidityinvariableinvarianceinvariance of cross ratioinvariance principleinvariance theorem