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March 25th, 2015, 03:18 PM   #1
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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!
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March 26th, 2015, 01:31 PM   #2
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Notation? W={...}. Explain.
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