Science:Math Exam Resources/Courses/MATH307/December 2005/Question 05 (a)
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Question 05 (a) 

Let X be the subspace in three dimensional space containing all vectors perpendicular to Let be the linear transformation defined by the first projective vector onto the plane and then projecting the resulting vector onto X. (a) Show that the vectors and form a basis for . 
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Hint 

Science:Math Exam Resources/Courses/MATH307/December 2005/Question 05 (a)/Hint 1 
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Solution 

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Please rate my easiness! It's quick and helps everyone guide their studies. To prove that a set of vectors form a basis, the set of vectors have to: (1) be linearly independent, and (2) span contains all vectors perpendicular to (1)
from the first row, we get from the third row, we get , which means Since is the only solution, and are linearly independent. (2) For arbitrary matrix that exists in X: , < Since the dot product = 0, we have proven that all vectors in the span of X is perpendicular to the matrix 