# Thread: Linearly independence in R3

1. ## Linearly independence in R3

Problem:
Find three vectors in R3 which are linearly dependent, and are such that any two of them are linearly independent.

What I have so far:
{v1, v2, v3} is a linearly dependent set.
{v1, v2} is a linearly independent set.
{v2, v3} is a linearly independent set.
{v1, v3} is a linearly independent set.

a*v1 + b*v2 + c*v3 = 0, where not all a, b, and c = 0 due to linearly dependence.

If a is not 0 then, v1 = - [ ( b*v2 + c*v3 ) / a ]

If b is not 0 then, v2 = - [ ( a*v1 + c*v3 ) / b ]

If c is not 0 then, v3 = - [ ( a*v1 + b*v2 ) / c ]

And, I am stuck. I don't know what to do after this, much less use this to find three vectors in R3 that satisfy this.

-Z

2. What you wrot eis correct, but you're trying too hard. The problem does not require an extensive construction. For example:

$\{(1,0,0),(0,1,0),(1,1,0)\}$

satisfies the required conditions.

3. Originally Posted by Nyrox
What you wrot eis correct, but you're trying too hard. The problem does not require an extensive construction. For example:

$\{(1,0,0),(0,1,0),(1,1,0)\}$

satisfies the required conditions.
Thanks! Lol, I guess I was trying too hard. I just went through the steps to prove that it satisfies those conditions. Thank you!