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.

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
. Let v1,v2,v3,v4 be a basis of V. Show that v1+v2, v2+v3, v3+v4, v4 is a...
. Let v1,v2,v3,v4 be a basis of V. Show that v1+v2, v2+v3, v3+v4, v4 is a basis of V
Let S = {v1,v2,v3,v4,v5} where v1= (1,−1,2,4), v2 = (0,3,1,2), v3 = (3,0,7,14), v4 = (1,−1,2,0),...
Let S = {v1,v2,v3,v4,v5} where v1= (1,−1,2,4), v2 = (0,3,1,2), v3 = (3,0,7,14), v4 = (1,−1,2,0), v5 = (2,1,5,6). Find a subset of S that forms a basis for span(S).
Let H=Span{v1,v2} and K=Span{v3,v4}, where v1,v2,v3,v4 are given below. v1 = [3 2 5], v2 =[4...
Let H=Span{v1,v2} and K=Span{v3,v4}, where v1,v2,v3,v4 are given below. v1 = [3 2 5], v2 =[4 2 6], v3 =[5 -1 1], v4 =[0 -21 -9] Then H and K are subspaces of R3 . In fact, H and K are planes in R3 through the origin, and they intersect in a line through 0. Find a nonzero vector w that generates that line. w = { _______ }
If S=(v1,v2,v3,v4) is a linearly independent sequence of vectors in Rn then A) n = 4...
If S=(v1,v2,v3,v4) is a linearly independent sequence of vectors in Rn then A) n = 4 B) The matrix ( v1 v2 v3 v4) has a unique pivot column. C) S is a basis for Span(v1,v2,v3,v4)
Let S = {v1, v2, v3, v4} be a given basis of R ^4 . Suppose...
Let S = {v1, v2, v3, v4} be a given basis of R ^4 . Suppose that A is a (3 × 4) matrix with the following properties: Av1 = 0, A(v1 + 2v4) = 0, Av2 =[ 1 1 1 ] T , Av3 = [ 0 −1 −4 ]T . Find a basis for N (A), and a basis for R(A). Fully justify your answer.
Let v1=(0,1,2,3),v2=(1,0,-1,0),v3=(0,4,-1,2), and v4=(0,5,1,5). Let S=(v1,v2,v3,v4) (1)find a basis for span(S) (2)is the vector e1=(1,0,0,0) in...
Let v1=(0,1,2,3),v2=(1,0,-1,0),v3=(0,4,-1,2), and v4=(0,5,1,5). Let S=(v1,v2,v3,v4) (1)find a basis for span(S) (2)is the vector e1=(1,0,0,0) in the span of S? Why?
Determine whether the given vectors span R3 V1=(-1,5,2), V2=(3,1,1), V3=(2,0,-2), V4=(4,1,0)
Determine whether the given vectors span R3 V1=(-1,5,2), V2=(3,1,1), V3=(2,0,-2), V4=(4,1,0)
Let X be a real vector space. Suppose {⃗v1,⃗v2,⃗v3} ⊂ X is a linearly independent set,...
Let X be a real vector space. Suppose {⃗v1,⃗v2,⃗v3} ⊂ X is a linearly independent set, and suppose {w⃗1,w⃗2,w⃗3} ⊂ X is a linearly dependent set. Define V = span{⃗v1,⃗v2,⃗v3} and W = span{w⃗1,w⃗2,w⃗3}. (a) Is there a linear transformation P : V → W such that P(⃗vi) = w⃗i for i = 1, 2, 3? (b) Is there a linear transformation Q : W → V such that Q(w⃗i) = ⃗vi for i = 1, 2, 3? Hint: the...
Prove that Let S={v1,v2,v3} be a linearly indepedent set of vectors om a vector space V....
Prove that Let S={v1,v2,v3} be a linearly indepedent set of vectors om a vector space V. Then so are {v1},{v2},{v3},{v1,v2},{v1,v3},{v2,v3}
Let {V1, V2,...,Vn} be a linearly independent set of vectors choosen from vector space V. Define...
Let {V1, V2,...,Vn} be a linearly independent set of vectors choosen from vector space V. Define w1=V1, w2= v1+v2, w3=v1+ v2+v3,..., wn=v1+v2+v3+...+vn. (a) Show that {w1, w2, w3...,wn} is a linearly independent set. (b) Can you include that {w1,w2,...,wn} is a basis for V? Why or why not?