Definition
Recall that one of the ten parts of the definition of a vector space says that
if is a vector space, then there exists a vector in
such that for all in .
Statement
Let be any vector space.
Prove that if is a zero vector of , then for all in .
Proof
Suppose for full generality that is any vector space and is any vector in .
Suppose is any zero vector of .
Show that .
By the definition of a vector space, since is a zero vector, .
Since , we can interchange the order of addition and obtain .
Since was chosen arbitrarily, we conclude that for all in .
Allowed answers
V is a vector space, 0+v=v, v+0=v, V is closed under addition, V is closed under scalar multiplication, addition is commutative in V, addition is associative in V, the zero vector in V is an additive identity, additive inverses exist in V, 1 is a multiplicative identity, scalar multiplication is associative, scalar multiplication distributes over vector addition, scalar multiplication distributes over scalar addition
You can earn partial credit on this problem.