4. (a) Let A E Mmxn (R). Let W₁ CR" be the row space of A (i.e. the span of the row vectors of A), and let W₂ C Rn be the solution space of the homogeneous system of linear equations Ax 0. Show that W₁ and W2 are orthogonal complementary pair in R". = (b) Show that any subspace of R" is the solution space of some homogeneous system of linear equations. More precisely, show that if W CR" is a subspace of dimension m, then there exists a homogeneous system of (n - m) linear equations in n unknowns whose solution space is W. (Hint: use (a).)

4. (a) Let A E Mmxn (R). Let W₁ CR" be the row space of A (i.e. the span of the row vectors of A), and let W₂ C Rn be the solution space of the homogeneous system of linear equations Ax 0. Show that W₁ and W2 are orthogonal complementary pair in R". = (b) Show that any subspace of R" is the solution space of some homogeneous system of linear equations. More precisely, show that if W CR" is a subspace of dimension m, then there exists a homogeneous system of (n - m) linear equations in n unknowns whose solution space is W. (Hint: use (a).)

Elementary Linear Algebra (MindTap Course List)

8th Edition

ISBN:9781305658004

Author:Ron Larson

Publisher:Ron Larson

Chapter4: Vector Spaces

Section4.4: Spanning Sets And Linear Independence

Problem 74E: Let u, v, and w be any three vectors from a vector space V. Determine whether the set of vectors...

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