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44 Challenging problems. Many are quite difficult, and tests if your physics understand is solid enough!
This is a tutorial on arXiv about how negative refractive index emerges.
Vinay Deolalikar, HP Labs researcher, claimed to have proved NP not equal to P. The website is his homepage in HP. You can find his 103 paper in pdf here. And he said he will post the final version when ready. Here is his email claiming to have solved the problem:
