Book
Linear Algebra
Author
Gilbert Strang
Edition
b=matrix([[1,0,0,0],[0,1,0,0],[0,0,1,0],[0,0,0,1]]) d=4*b d c=matrix([[1,1,1,1],[1,1,1,1],[1,1,1,1],[1,1,1,1]]) c A=d-c;A A*matrix([[1],[1],[1],[1]])
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