KnowraOrthogonal projectionLinked fromLinked fromThe 19 pages that link to Orthogonal projection, each with the reason it gives.All 19Broader topic 1Related 16Compared with 2Orthogonal matrixCompared with: Unlike an orthogonal matrix, a projection usually shortens vectors and is not invertible.Riesz's lemmaCompared with: Riesz's lemma applies without an inner product or a nearest point in the subspace.