
Linear Algebra Linear Algebra Math Forum 
 LinkBack  Thread Tools  Display Modes 
August 24th, 2015, 08:28 AM  #1 
Member Joined: Mar 2015 From: Brasil Posts: 90 Thanks: 4  Linear Independence and Linear Dependence.
Prove that the three vectors are $\mathbb{R}^{2}$ LD (Linear Dependence). Generalize this result to $\mathbb{R}^{n}$.
Last edited by skipjack; August 24th, 2015 at 11:25 AM. 
August 24th, 2015, 10:45 AM  #2 
Math Team Joined: Dec 2013 From: Colombia Posts: 7,305 Thanks: 2443 Math Focus: Mainly analysis and algebra 
Suppose we are given vectors $\vec u$, $\vec v$ and $\vec w$ all in $\mathbb R^2$. If $\vec u$ and $\vec v$ are LD then there exist nonzero real numbers $a$ and $b$ such that $a\vec u + b\vec v = 0$. And we can easily expand this linear combination to include $\vec w$ too. If $\vec u$ and $\vec v$ are LI, they must span $\mathbb R^2$ (do you need to prove this?) and so $\vec w = a\vec u + b\vec v$ for some real numbers $a$ and $b$. 

Tags 
dependence, independence, linear 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
linear subspace  dependence  Luiz  Linear Algebra  1  August 19th, 2015 09:09 AM 
Linear independence & linear dependence  autumn94  Linear Algebra  1  March 29th, 2015 02:14 PM 
Determine linear dependence over Z2  phongchaychua  Linear Algebra  2  April 27th, 2014 05:08 AM 
Linear Dependence Equation  Spennet  Linear Algebra  2  August 18th, 2011 08:00 AM 
Linear Dependence Proof  Singularity  Linear Algebra  1  February 4th, 2010 05:32 PM 