Linear Algebra Question.
Is it true that if a matrix T is the orthogonal projection onto a line T, the columns of the matrix T will be pairwise parallel?
What does pairwise parallel mean? (Is it any two columns will have a dot product to be the same?)
Will a reflection be pairwise orthogonal? Again what does this mean? (Is it any two columns will have a dot product to be 0?)

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I am thinking that it means that one is a scalar multiple of the other?

\(<2,3,4>\iff<8,12,16>\)?

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