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4. Novel Colloidal Interactions in Anisotropic Fluids
5. Hedgehogs are point defects in a nematic liquid crystal where all directions are swept out on the unit sphere. The simplest type of hedgehog is the radial hedgehog in which the director points radially to the defect center. For a discussion of defects in nematic liquid crystals see: J. Prost and P. G. de Gennes The Physics of Liquid Crystals (Clarendon Oxford 1993).