Abstract
We give an example of hypersurfaces with non-isolated singularities in $\mathrm{P}^4(\mathbf{C})$, whose normalizations have isolated rational quadruple points only as singularities. From Schlessinger's criterion, it follows that these isolated rational singular points are rigid under small deformations.
Citation
Shoji Tsuboi. "On certain hypersurfaces with non-isolated singularities in $\mathrm {P}^4(\mathbf {C})$." Proc. Japan Acad. Ser. A Math. Sci. 79 (1) 1 - 4, Jan. 2003. https://doi.org/10.3792/pjaa.79.1
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