When solving a hard$-$margin SVM$,$ you have used the dual form and obtained

result vector. Now prove that it is possible that a data point is on the boundary, namely

yn$($wT xn $+$ b$)=1$ when n $=0.[$Hint: Consider a toy data set with two positive examples

at $(0,0)$ and $(1,0),$ and one negative example at $(0,1).$