Quadruple jump controversy it is better to attempt a triple Axel, which is safer and more likely to be landed cleanly. Additionally, the difference in base value between a triple Axel and a triple lutz is 2.2 points, whereas between a quadruple toe and a triple Axel it is only 1.6 points. The degree of difficulty, however, between a triple Axel and a quad is greater than the degree of difficulty between a triple Lutz and a triple Axel. Following the figure skating competition in Vancouver, the ISU was urged to reexamine the scoring system at its general assembly scheduled for June, 2010,
Quadruple product Quadruple product In mathematics, the quadruple product is a product of four vectors in three-dimensional Euclidean space. The name "quadruple product" is used for two different products, the scalar-valued scalar quadruple product and the vector-valued vector quadruple product or vector product of four vectors . The scalar quadruple product is defined as the dot product of two cross products: where a, b, c, d are vectors in three-dimensional Euclidean space. It can be evaluated using the identity: or using the determinant: The vector quadruple product is defined as the cross product of two cross products: where a, b, c, d