Question

Suppose ⃗v1,⃗v2,⃗v3,⃗v4 ∈ R3. Let V = {⃗v1,⃗v2,⃗v3,⃗v4} and let X = [⃗v1|⃗v2|⃗v3|⃗v4] be the matrix...

Suppose ⃗v1,⃗v2,⃗v3,⃗v4 ∈ R3. Let V = {⃗v1,⃗v2,⃗v3,⃗v4} and let X = [⃗v1|⃗v2|⃗v3|⃗v4] be the matrix whose columns are ⃗v1,⃗v2,⃗v3,⃗v4. Suppose further that every subset Y ⊂ V of size two is linearly independent. Explain what form(s) rref(X), the reduced row echelon form of X, must take in this case. Hint: you won’t be able to pin down exact numbers for every entry of rref(X), but you might know things like whether the entry can be zero or not, etc.

Homework Answers

Answer #1

The columns v1,v2,v3,v4 of X , belong to R3. Further, the standard basis of R3 is {e1,e2,e3} = { (1,0,0)T, (0,1,0)T, (0,0,1)T}. We are also given that every subset Y ⊂ V of size two is linearly independent. Also, the maximum number of linearly independent vectors in R3 is 3 so that any 4 vectors in R3 are linearly dependent. Hence, 3 of the columns of the RREF of X will be e1,e2,e3 and the remaining 4th column of X will be a linear combination of e1,e2,e3 i.e., a vector of the form (x,y,z)T, where x,y,z are real numbers.

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