>Ringworld is like a Dyson Sphere with the hemispheres removed such that only the the equatorial band remains. The "walls" at the edges are about fifty miles high. As the Ringworld rotates around it's white dwarf, the centrifical force prevents the trapped atmosphere from spilling over the edges. That seems to indicate a material with exceptional properties.
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>But it may be an over statement to call it "relativity" resistant!

Well, I think we can safely assume that any material created (in this our Universe) will be subject to some restrictions. According to our current understanding of physics, some of these restrictions seem to be related to the Theory of Relativity, i.e., any attempt to make a signal travel faster than light will probably be futile.

Of course, that doesn't hinder us to make materials that are much stronger than any that are currently known.

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>>For example, it is currently believed that the effect of a change in the distribution of masses would propagate at the speed of light.
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>This is where relativity kicked nuetonian physics in the fanny. Neuton said the dissappearance of the sun would be noticed by earth immediately. Relativity said the loss of the sun would take at least 8 minutes (the speed of light) to inform earth. I don't know if the sugesstion was the speed of light - or accepted something less - it just was not instaneous.

Yes, exactly. By the way, the spelling is "Newton" or "Newtonian".