Edible seaweed soaps, and lotions. Common edible seaweeds include: Edible seaweed Edible seaweed, or sea vegetables, are algae that can be eaten and used in the preparation of food. They typically contain high amounts of fiber. They may belong to one of several groups of multicellular algae: the red algae, green algae, and brown algae. Seaweeds are also harvested or cultivated for the extraction of polysaccharides such as alginate, agar and carrageenan, gelatinous substances collectively known as hydrocolloids or phycocolloids. Hydrocolloids have attained commercial significance, especially in food production as food additives. The food industry exploits the gelling, water-retention, emulsifying and other
Singular point of an algebraic variety variety is a manifold near every regular point. But it is important to note that a real variety may be a manifold and have singular points. For example the equation formula_2 defines a real analytic manifold but has a singular point at the origin. This may be explained by saying that the curve has two complex conjugate branches that cut the real branch at the origin. As the notion of singular points is a purely local property, the above definition can be extended to cover the wider class of smooth mappings, (functions from "M" to R where all derivatives exist).