史记 司马迁原文注释 中国通史中华上下五千年历史故事国学书局 二十四史资治通鉴 史记故事 史记青少版 史记 白话 相关出版：史记中华书局 史记 中华书局 全本全注 pdf 下载 极速 mobi txt pdb lrf 网盘

This text presents an account of ***ytic electronic structure, to be distinguished from computational electronic structure. Both are based upon a one-electron approximation, local-density theory, and the determination of the quantum-mechanical electronic states. They both seek to predict the properties of the resulting solids, or molecules on the basis of these states. In the computational mode, the minimum number of approximati*** are used, and numerical soluti*** are sought. Here we seek instead to focus on the most important ***ects of the solution, *** what approximati*** are necessary in order to proceed ***ytically and obtain formulae for the properties. This reducing of the problem to basics is almost always less accurate that the computational solution, but has the advantage that it displays the dependence of any property on the parameters Of the system. It gives us an understanding of the property in a sense that a numerical solution, or a direct measurement, cannot.

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This text presents an account of ***ytic electronic structure, to be distinguished from computational electronic structure. Both are based upon a one-electron approximation, local-density theory, and the determination of the quantum-mechanical electronic states. They both seek to predict the properties of the resulting solids, or molecules on the basis of these states. In the computational mode, the minimum number of approximati*** are used, and numerical soluti*** are sought. Here we seek instead to focus on the most important ***ects of the solution, *** what approximati*** are necessary in order to proceed ***ytically and obtain formulae for the properties. This reducing of the problem to basics is almost always less accurate that the computational solution, but has the advantage that it displays the dependence of any property on the parameters Of the system. It gives us an understanding of the property in a sense that a numerical solution, or a direct measurement, cannot.