Give an example of a subset (not subspace) of R3 that has an infinite number of elements, is closed under addition, contains the zero vector, but is not closed under scalar multiplication.

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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Give an example of a subset (not subspace) of R that has an infinite number of
elements, is closed under addition, contains the zero vector, but is not closed under scalar
multiplication.
Transcribed Image Text:Give an example of a subset (not subspace) of R that has an infinite number of elements, is closed under addition, contains the zero vector, but is not closed under scalar multiplication.
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Step 1

A subset W of vector space V over the scalar field K is a subspace of V if and only if following three criteria are met.

  1. W contains the zero vector of V.
  2. If u,vW , then u+vW. then W is closed under addition.
  3. If uW, aK then auW then W is closed under scalar multiplication.

Given vector space is R3, here the scalar field is R.

Let us define W={(x1,x2,x3)R3/x10,x2,x3R}. 

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