There is no single “best” mattress firmness level. Body weight, sleeping position, and health concerns are all important factors that influence whether someone will sleep better on a firmer or softer mattress.
A filled torus (a doughnut) is a 3-manifold homeomorphic to \(S^1 \times D^2\), where \(D^2\) is the 2-dimensional disk. There exists a deformation retract from the doughnut to a circle, so the fundamental group of the doughnut is \(\pi_1(S^1 \times D^2) \cong \mathbb{Z}\).
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While there is a lot to tell on OpenBSD on SGI hardware alone, I think it is
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