Jade Jade Jade refers to an ornamental mineral, mostly known for its green varieties. It can refer to either of two different minerals: nephrite, a silicate of calcium and magnesium, or jadeite, a silicate of sodium and aluminium. Jade is featured prominently in ancient Asian art, as well as having an important place in many other cultures. The English word "jade" is derived (via French "l'ejade" and Latin "ilia" "flanks, kidney area") from the Spanish term "piedra de ijada" (first recorded in 1565) or "loin stone", from its reputed efficacy in curing ailments of the loins and kidneys. "Nephrite" is derived
Tensor product of quadratic forms from this that if we have diagonalizations of our quadratic forms (which is always possible if formula_9 is invertible) such that then the tensor product has diagonalization Tensor product of quadratic forms The tensor product of quadratic forms is most easily understood when one views the quadratic forms as "quadratic spaces". If "R" is a commutative ring where "2" is invertible, and if formula_1 and formula_2 are two quadratic spaces over "R", then their tensor product formula_3 is the quadratic space whose underlying "R"-module is the tensor product formula_4 of "R"-modules and whose quadratic form is the quadratic form associated