space axioms or from a property of scalars or from a previously proved theorem. (a) The vector O is unique. [Assume that there are two, O1 and O2. Show that they're equal. First step: use axiom 4.] (b) The number 0 times any vector is the zero vector: 0v =0. (c) The vector v' is unique. \text { (d) }(-1) \vec{v}=\vec{v}^{\prime}

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