%0 Journal Article %T Four-Dimensional Space’s Hypersurface Mapping Singularity %A Lyashkov, A.A. %A Panchuk, K.L. %A Varepo, L.G. %K mapping singularity, hypersurface, discriminant, envelope, geometric modeling. %J Geometry & Graphics %D 2017 %N 5 %P 7 %I INFRA-M Academic Publishing LLC.