Vector space over the field of complex numbers

**tttcomrader** · January 19th 2008, 10:48 AM

Let $V = \{ ( a_{1} , a_{2} , . . . , a_{n} ) : a_{i} \in C for i = 1 , 2, . . . , n \}$ . Is V a vector space over the field of complex numbers with operations of coordinatewise addition and multiplication?

proof. Let x and y be in V, then x and y are consisted of coordinates of complex numbers. x+y exist and ix exist. So would that be a vector space?

**ThePerfectHacker** · January 19th 2008, 04:39 PM

Originally Posted by tttcomrader

Let $V = \{ ( a_{1} , a_{2} , . . . , a_{n} ) : a_{i} \in C for i = 1 , 2, . . . , n \}$ . Is V a vector space over the field of complex numbers with operations of coordinatewise addition and multiplication?

proof. Let x and y be in V, then x and y are consisted of coordinates of complex numbers. x+y exist and ix exist. So would that be a vector space?

You need to prove a lot of things. You need to show $V$ is an abelian group. Then you need to show: (i) $1\bold{v} = \bold{v}$ (ii) $a(b\bold{v}) = (ab)\bold{v}$ (iii) $a(\bold{v}+\bold{u}) = a\bold{v}+b\bold{u}$ (iv) $(a+b)\bold{v} = a\bold{v}+b\bold{v}$ .

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