Question: 3. For v = (x, y) and w = (a, b) in Ra, define d(v, w) = x - a . Show that this does

3. For v = (x, y) and w = (a, b)

3. For v = (x, y) and w = (a, b) in Ra, define d(v, w) = x - a . Show that this does not give a metric on R2

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