Content 目录
https://journals.plos.org/ploscompbiol/article?id=10.1371/journal.pcbi.1007448#sec001
https://feyncalc.github.io/Tools and Tables for Quantum Field Theory Calculations
https://library.wolfram.com/infocenter/ID/8848/
https://library.wolfram.com/infocenter/MathSource/8329/
https://library.wolfram.com/infocenter/BySubject/Science/Physics/Relativity?page=1
https://josmar493.dreamhosters.com/
https://tex.stackexchange.com/questions/99124/how-to-draw-penrose-diagrams-with-tikz
https://texample.net/spacetime/
https://zhuanlan.zhihu.com/p/346370129
https://pennylane.ai/qml/demonstrations
Find extremals of a list/table 寻找一个list或者table的极值点/极值
按照{x_1,x_2}的第二个元素从小到大排序
Input: Sort[{{a, 2}, {c, 1}, {d, 3}}, #1[[2]] < #2[[2]] &]
Output: {{c, 1}, {a, 2}, {d, 3}}
https://www.bilibili.com/video/BV1L24y1v71T/?spm_id_from=333.999.0.0&vd_source=9bc04c1dcc8c72244af44d6d513aa73f