Strong reinforcement conjecture for simultaneous drawing urns

Let d2d\geq 2 and consider the simultaneous drawing urn process with reinforcement weights (wi)i0(w_i)_{i\geq 0}. Let AA be the event that there is a time after which all balls drawn from the urn have the same colour, and let

s:=i=01wi.s_{\infty}:=\sum_{i=0}^{\infty}\frac{1}{w_i}.

Strong reinforcement conjecture. If s<s_{\infty}<\infty, then

P[A]=1.\mathbb{P}[A]=1.

For the ordinary urn process (d=1d=1), Davis's result establishes the analogous zero-one law: almost-sure eventual fixation occurs exactly when the strong reinforcement hypothesis holds. The conjecture asks whether the almost-sure fixation conclusion remains valid for simultaneous drawing with every d2d\geq 2; the supplied source gives no resolution.

Sources & referencesView supporting material

Primary source

Mickaël Launay, “Urns with simultaneous drawing”, arXiv:1201.3495 (2012).

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