👉 In the context of mathematics, "retroreflection" refers to a specific technique used in calculus and linear algebra where one defines a function or vector space as being orthogonal to another. This means that if two vectors are orthogonal (meaning they have a dot product of zero), then their inner products must also be zero. For example, consider the set of all vectors in 3-dimensional space that are orthogonal to the plane spanned by the vectors i and j. These vectors are: - i =
