数学家的眼光 香港商务印书馆 张景中 数理逻辑 数学基础 pdf 免费 地址 txt lrf 下载 kindle umd

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What is nothing? Macbeth answered this question with admirable concinnity: “Nothing is, but what is not.” My dictionary puts it somewhat more paradoxically—“nothing (n.): a thing that does not exist.” Although Parmenides, the ancient Eleatic sage, declared that it was impossible to speak of what is not—thereby violating his own precept—the plain man knows better. Nothing is popularly held to be better than a dry martini, but worse than sand in the bedsheets. A poor man has it, a rich man needs it, and if you eat it for a long time, it’ll kill you. On occasion, nothing could be further from the truth, but it is not clear how much further. It can be both black and white all over at the same time. Nothing is impossible for God, yet it is a cinch for the rankest incompetent. No matte***hat pai...

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