4. Let Mag, denote the set of all n x n magic squares, and let Mag, denote the set of all n xn magic squares of weight 0. (a) If A and B are matrices in Mag,, is A+ B also in Mag,? Furthermore, suppose e is a real number; is cA in Mag,? (In other words: Is Mag, a subspace of the vector space of all n x n matrices?) 2

Linear Algebra: A Modern Introduction
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Chapter6: Vector Spaces
Section6.2: Linear Independence, Basis, And Dimension
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4. Let Mag, denote the set of all n xn magic squares, and let Mag, denote the set of all n x n
magic squares of weight 0.
(a) If A and B are matrices in Mag,, is A+ B also in Mag,? Furthermore, suppose e is a
real number; is cA in Mag,? (In other words: Is Mag, a subspace of the vector space
of all n x n matrices?)
2
(b) If A and B are matrices in Mag, is A+ B also in Mag,? Furthermore, suppose e is a
real number; is cA in Mag? (In other words: Is Mag a subspace of Magn?)
Transcribed Image Text:4. Let Mag, denote the set of all n xn magic squares, and let Mag, denote the set of all n x n magic squares of weight 0. (a) If A and B are matrices in Mag,, is A+ B also in Mag,? Furthermore, suppose e is a real number; is cA in Mag,? (In other words: Is Mag, a subspace of the vector space of all n x n matrices?) 2 (b) If A and B are matrices in Mag, is A+ B also in Mag,? Furthermore, suppose e is a real number; is cA in Mag? (In other words: Is Mag a subspace of Magn?)
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