当琴玄震动时形成驻波,这个时候它的相速是0.但是它的群速不是0.晶体中的光的相速可以超出光速。但群速不会。
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This is hard to me since I am a mathematician/statistician
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11/07/2018 postreply
06:45:22
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String Theory is not mathematically rigorous in my understanding
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11/07/2018 postreply
08:27:17