EntityQ3492725· pop 8· linked from 45 articlesCausticSign in to saveenvelope of rays either reflected or refracted by a manifoldConnectionspedal curveEntitysymplectic manifoldEntitynephroidEntityrainbowEntityInternational Standard Book NumberEntitycircleEntitylineEntitywavelengthEntityrefractionEntityparabolaEntitysubsetEntitysunlightEntitybinary operationEntitydifferential geometryEntityVladimir ArnoldEntitymathematical operationEntitymanifoldEntitygeometrical opticsEntityCramer's ruleEntityMathWorldEntityCategoriesDifferential geometry