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we consider a triangle formulación alternativa, de la omi shortlist 1974, finlandia 2: se considera un triángulo . demostrar que: es una condición necesaria y suficiente para la existencia de un punto en el segmento a fin de que es la media geométrica de y .
alternative formulation, from imo shortlist 1974, finland 2: we consider a triangle . prove that: is a necessary and sufficient condition for the existence of a point on the segment so that is the geometrical mean of and .

in other words, "s"("x") is minimal sufficient if and only if#"s"("x") is sufficient, and#if "t"("x") is sufficient, then there exists a function "f" such that "s"("x") = "f"("t"("x")).
in other words, "s"("x") is minimal sufficient if and only if#"s"("x") is sufficient, and#if "t"("x") is sufficient, then there exists a function "f" such that "s"("x") = "f"("t"("x")).