extendibility; partial exchangeability
We improve a result of Bassan and Scarsini (1998) concerning necessary conditions for finite and infinite extendibility of a finite row-column exchangeable array, and provide a simpler proof for the result.
 Bassan B., Scarsini M.: Finite row-column exchangeable arrays
. Comment. Math. Univ. Carolinae 39 (1998), 137-145. MR 1622998
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