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https://jjthetutor.com/let-u-and-v-be-distinct-vectors-in-a-vector-space-v-show-that-uv-is-linearly-dependent-if-and-only-if-u-and-v-is-a-multiple-of-the-other/
Let u and v be distinct vectors in a vector space V. Show that {u,v} is linearly dependent if and only if u and v is a multiple of the other