Top network posts

• 81 Why are differential equations for fields in physics of order two?
• 79 Differentiating Propagator, Green's function, Correlation function, etc
• 72 lim sup and lim inf of sequence of sets.
• 50 Is there a function with the property $f(n)=f^{(n)}(0)$?
• 47 What is the algebraic structure of functions with fixed points?
• 43 When does the set enter set theory?
• 41 How to compute $\prod_{n=1}^\infty\left(1+\frac{1}{n!}\right)$?
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