量子电动力学(QED)有多精确? - 知乎
量子电动力学(QED,Quantum Electrodynamics) 是描述电磁相互作用的理论,可以说是目前为止最为精确的理论了。 在量子力学提出之后(主要标志为1926年薛定谔提出薛定谔方程),狄 …
What are the advantages of ending a proof with “QED”?
May 31, 2019 · QED is short for the Latin phrase quod erat demonstrandum and means, loosely, "that which was to be shown". As noted in the comments, it's a summary way of saying that the …
What is the meaning of the expression Q.E.D.? Is it similar to ...
Feb 19, 2015 · It's an abbreviation of quod erat demonstrandum, which is the Latin translation of a Greek phrase meaning "which had to be proven". To the ancient Greeks, a proof wasn't …
以「Q.E.D」收尾证明语段,是什么梗? - 知乎
(also written QED and QED) is an initialism of the Latin phrase quod erat demonstrandum, meaning "what was to be demonstrated", or, less formally, "thus it has been demonstrated".
量子电动力学(QED)存在缺陷吗? - 知乎
量子电动力学(QED)存在缺陷吗? QED被认为是物理学中最成功的理论,其理论预测与实验数据高度符合。 既然如此,为什么一些电磁现象至今也没有好的理论解释? 比如石墨烯的超导问题 …
Why does drawing $\square$ mean the end of a proof?
Apr 21, 2017 · 0 I had always used QED (quod erat demonstrandum) at the end of a proof until I was introduced to using Halmos' symbol. Since it was a 4-sided symbol, my mind has always …
在数学高考证明题中写下Q.E.D.可能被判标记卷吗? - 知乎
众所周知 Q.E.D. 是quite easily done的缩写 挥挥洒洒地终结证明,不经意间注记quite easily done,大佬的高考,往往就是这么朴实无华,且枯燥 而阅卷老师只会在佩服之余,点下满分按 …
有没有什么数学证明用的术语的英文或拉丁文? - 知乎
其实吧,写英语并不一定比中文快多少。不过呢掌握一些基本的术语至少有有利于读书,我记得好像一前见过一本专门介绍这种术语的书,但是忘记名字了。列一些我知道的比较常见的拉丁 …
如何完全用量子电动力学描述一个匀强电场中做加速运动的电子?
这导致电子在吸收光子被加速的同时也会出现发射光子被减速的过程,那么这个时候,我们将预期电子既不会加速e 也不会被减速,能量转移量为零,即 \Delta E_ {QED}=0 。 天啊,这怎么回事 …
全局对称性(global symmetry)和规范对称性(gauge …
全局对称性(Global Symmetry)与规范对称性(Gauge Symmetry)的区别 全局对称性和规范对称性是物理学中描述对称性的两种基本类型,它们在数学结构、物理意义和实验表现上存在根本 …