
Linear Algebra Linear Algebra Math Forum 
 LinkBack  Thread Tools  Display Modes 
March 25th, 2015, 03:18 PM  #1 
Member Joined: Jan 2015 From: Colorado Posts: 32 Thanks: 0  how to tell if something is closed under addition and scalar multipliction f
I am having serious trouble trying to figure out this whole, "being closed under addition and scalar multiplication" Our example is Let W={[a,b,c]:a+b=4c;b=2c} I need to figure out if it is closed under addition and scalar multiplication, I am not sure how to do this though.. do I just add a+b=4c and b=2c together? If you could help explain this to me, I'll greatly appreciate it! Thank you! 
March 26th, 2015, 01:31 PM  #2 
Global Moderator Joined: May 2007 Posts: 6,756 Thanks: 696 
Notation? W={...}. Explain.


Tags 
addition, closed, multipliction, scalar 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Closed set and closed ball  Vasily  Real Analysis  3  February 4th, 2013 12:49 PM 
Is the union of infinite disjoint closed sets closed?  03sqq  Real Analysis  4  November 13th, 2012 03:40 AM 
Scalar vectors : need help in proving  rnck  Applied Math  4  September 14th, 2012 07:25 AM 
Scalar field of given gradient  SameOldHat  Linear Algebra  0  April 9th, 2011 05:35 AM 
Scalar IVP existenceuniqueness for x(t)?  lu5t  Abstract Algebra  0  March 4th, 2011 08:16 AM 