1742年德国人哥德巴赫给当时住在俄国彼得堡的大数学家欧拉写了一封信,在信中提出两个问题:第一,是否每个大于4的偶数都能表示为两个奇质数之和?如6=3+3,14=3+11等。第二,是否...
You can be extrovertedor introverted or somewhere in the middle, but no matter where you fall on the personality spectrum, there’ll be times when conversation doesn’t come easy. Overthinking it will generally get you nowhere, but not ha...