Can someone give me an example of a simple ring that is not semi-simple ?
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Sotiris Z.
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https://en.wikipedia.org/wiki/Weyl_algebra – Angina Seng Feb 13 '19 at 18:08
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Also this DaRT search – rschwieb Feb 13 '19 at 18:25
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Also please read this advice and this advice on how to ask questions. If you continue making posts that are just problem statements, and clearly aren't searching for your answer first, you're likely to face a lot of blowback, and perhaps eventually throttling of your ability to ask questions. – rschwieb Feb 13 '19 at 18:28