## The Annals of Probability

### The Almost Sure Stability of Quadratic Forms

#### Abstract

Let $w_{jk}$ be a doubly indexed sequence of weights, let $\{X_k\}$ be a sequence of independent random variables and let $Q_n = \Sigma^n_{j,k=1} w_{jk}X_jX_k$. Sufficient conditions for the almost sure stability of $Q_n$ are given and the "tightness" of these conditions is investigated. These quadratic forms are weighted sums of dependent variables; however, their stability properties are very much like those established in the literature for weighted sums of independent variables.

#### Article information

Source
Ann. Probab., Volume 7, Number 4 (1979), 738-743.

Dates
First available in Project Euclid: 19 April 2007

Permanent link to this document
https://projecteuclid.org/euclid.aop/1176994995

Digital Object Identifier
doi:10.1214/aop/1176994995

Mathematical Reviews number (MathSciNet)
MR537219

Zentralblatt MATH identifier
0411.60033

JSTOR