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gtfitzpatrick
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Homework Statement
let V be the vector space consisting of all infinite real sequences. Show that the subset W consisting of all such sequences with only finitely many non-0 entities is a subspace of V
The Attempt at a Solution
Ok so i have to show 1.Closure under Addition,2. Closure under Scalar Multiplcation
let x=(x[tex]_{n}[/tex]),y=(y[tex]_{n}[/tex]) [tex]\in[/tex] W
x + y [tex]\in[/tex] W closed under addition and since W is a set of finite sequences [tex]\in[/tex] V as it consists of infinite sequences
[tex]\lambda[/tex] is a scalar and [tex]\lambda[/tex]x [tex]\in[/tex] W closed under scalar multiplication and since W is a set of finite sequences [tex]\in[/tex] V as it consists of infinite sequences
I think this proves it
...But if [tex]\lambda[/tex] is negative this proof doesn't work,is there something i am missing or have i provided the required proof?
Thanks
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