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<span>作者简介：郑玩相，1985年毕业于首尔大学，1992年在韩国科学技术院获得物理学博士学位。专攻重力理论和量子对称性应用数学，著有十几种广受欢迎的科普读物。 </span>
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<span>翻译：王懿</span>
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