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Linear Algebra: Orthogonal Complements and Null Spaces

The fundamental theorem regarding orthogonal complements establishes that for any matrix A with independent columns, its null space constitutes the complete set of vectors perpendicular to every vector in the row space within Rⁿ, such that their dimensions sum exactly to n and they intersect only at the zero vector. This principle relies on the dot product condition (xᵀy = 0) defining orthogonality for both individual vectors and entire subspaces, formalizing how linear systems decompose multidimensional spaces into mutually perpendicular components without residual error in Rⁿ.