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In literatures on QCD confinement, I usually see the words ``center of group''.

It is defined to be the subgroup of some parent group and consists of elements which

commutes with all elements from the parent group. But what is the center of SU(3)

group? I need concrete answer as follows instead formal definition,

For SU(2) group, fundamental representation, the center consists the following

two matrices

c1=diag{1,1}, c2=diag{-1,-1}

What is the case for SU(3) group, fundamental representation?

Thank you very much!