Question: =+5. Let X, Y E 'P(V) be such that X C Y. If every element of Y can be expressed uniquely in the form VT_

=+5. Let X, Y E 'P(V) be such that X C Y. If every element of Y can be expressed uniquely in the form VT_ l ai Tx2 , a2 E [0,1], x2 E X, prove that X is a set of vertices of Y.

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