A beautiful answer to the question "What is a gapped versus gapless system [in physics]?" by Xiao-Gang Wen: https://physics.stackexchange.com/posts/29166/revisions …
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My physics tweeting is leading to a steady reduction in twitter followers. If I continue long enough, I may end up back where I started (0)
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Replying to @michael_nielsen
So, the Twitter universe does have a contracxtion phase following the expansion phase? This is very big news!
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