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Acta Mathematiea Academiae Seientiarum Hungaricae Tomus 26 (1--2), (1975), 81--85. AN INVARIANCE PRINCIPLE FOR STRONGLY MULTIPLICATIVE SEQUENCES By D. L. MCLEISH (Downsview) Introduction. Closely associated with most (though not all) central limit theorems is an invariance principle, also called Donsker's Theorem or a "functional central limit theorem". BROWN [2], and Lov~es [4], prove an invariance principle for mar- tingales and reverse martingales respectively, and invariance principles for dependent as well as independent variables appear in BILLINGSLEY [l] and PARTHASARATHY [5]. Here, we show an invariance principle complementary to several of the "strongly multiplicative" central limit theorems investigated recently, primarily by the Hungar- ian school. Let {X~; i-1, 2, 3, ...} be a sequence of random variables from an arbitrary probability triple (f2, ~, P) and suppose E(Xi)=0, E(X~)=G~ for all i= 1, 2, 3 ..... For convenience of notation, we will put S,,,~,= --~ X~ and Vs _ ~ ~r~,2 i=m+l i=m+l S,=So,, and V~= V02,,. By "Z', we shall mean "converges weakly to", usually in 9 the space of real numbers (in which case it is equivalent to convergence in distribu- tion) or in the space of right continuous functions on [0, 1] with no discontinuities of the
Acta Mathematica Academiae Scientiarum Hungarica – Springer Journals
Published: May 21, 2016
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