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 Dec 2 comment How do I explain the Königsberg Bridge problem to a child? What 'solution'? Has the Konigsberg Bridges problem been shown to have a Eulerian Cycle? By whom, and when? AFAIK, the problem has no solution (according to Euler). @superbest - the problem you showed has a solution (although not one where the end and start nodes are the same), but is orders of magnitude less problematic than the KB problem. Nov 8 awarded Student Oct 13 comment Covariance of *sum* of k autocorrelated variables Thanks for that, Alecos - what I was hoping to be able to do was express var(R) in terms of the autocovariance functions of the $r_t$, since for an MA(q), $$cov(r_t, r_{t-j})=\sigma^2 \left [ \sum_{i=0}^{q-j} \theta_i \theta_{j+i} \right ]^2$$ (for j = 1,...,q - 0 otherwise) - I have no doubt that it can be done, but it would involve decomposing the summation in your expression into combinations of the auto covariances. I think I'll have to do it by hand for a couple of q's and k's and see if I can see a pattern. Cheers GT Oct 13 awarded Editor Oct 13 revised Covariance of *sum* of k autocorrelated variables Fixed typo in 'guess' at var(r) Oct 9 asked Covariance of *sum* of k autocorrelated variables Jan 21 awarded Autobiographer Jan 21 awarded Supporter