Linear Algebra and Its Applications · Problem 3.2.26

Orthogonality — Gilbert Strang

Mathematics · cosines-projections-onto-lines

Problem

Project a1=(1,0)a_1 = (1,0) onto a2=(1,2)a_2 = (1,2). Then project the result back onto a1a_1. Draw these projections and multiply the projection matrices P1P2P_1P_2: Is this a projection?

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