let gram matrix of vectors v1....vk in V is

<v1,v1> <v1,v2>...<v1,vk>

G(v1,...,vk)= ( .............................. )

<vk,v1> <vk,v2>...<vk,vk>

then prove if v1....vk are linearly dependent then det (G(v1...vk))=0 ,and if v1,...vk are linearly independent then det(G(v1,...,vk))>0

hints:gram matrix is the matrix of <,> restricted to the span of vi-s

can someone help me ???many thanks