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192 V. H. de la Peña, R. Ibragimov and S. Sharakhmetov<br />

Theorem 5.5. The identically distributed r.v.’s X1, . . . , Xn are exchangeable if and<br />

only if the functions gi1,...,ic in representations (2.1) and (2.2) satisfy the conditions<br />

gi1,...,ic(ξi1, . . . , ξic) = gi π(1),...,i π(c) (ξi π(1) , . . . , ξi π(ic) ) (a.s.) for all 1≤i1

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