Hans Engler
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 1d reviewed Leave Open $\prod\left(1-p_n\right)>0$ 1d reviewed Close It is true that $rank(xy^T)=1$? 1d reviewed Close differential equation with non differentiable non homogeneous part 1d reviewed Close Gaussian Elimination vs matrix inversion 1d reviewed Close Hypothetical proof of Goldbach's conjecture? 1d reviewed Leave Open Categorically deducding measurability of sections 1d reviewed Leave Open Existence of a sequence related to the convergence of a series 1d comment Existence of a sequence related to the convergence of a series Hello and welcome! Please include your work so far. Where are you stuck? Can you think of a simple example where the answer is yes? 1d reviewed Close In how many ways can $8$ appointments be scheduled for a physician visiting a nursing home with $20$ patients? 1d comment Prove that $a+\frac{1}{b}>2$ or $b+\frac{1}{a}>2$ for two strict positive numbers What about $a = b = 1$? Feb 9 comment Converse of Fermat's Little Theorem. Try $n = 561$ or $n = 512461$. These are examples of Carmichael numbers (see the previous comment). The phenomenon is interesting enough to have attracted the attention of many well-known mathematicians. Feb 8 reviewed Leave Open The role of visualization and intuition in graduate and postgraduate math and developing it Feb 8 reviewed Close What is the probability of observing three or fewer 6s when rolling a fair die twenty times? Feb 8 reviewed Close Probability mass function for the number of defective light bulbs among selected Feb 8 reviewed Leave Open Contraction of a maximal ideal in a polynomial ring Feb 8 reviewed Leave Open Joint Distribution Transformation Feb 8 reviewed Close On summation of series Feb 8 comment Formula for $\sum \limits_{n=0}^{\infty} \frac{1}{(n+a)!}$ This is the value of the Mittag Leffler function $E_{1,a+1}$ at $z = 1$. Other than that, it is just what you wrote it is - $e$ minus a finite sum. Feb 8 reviewed Leave Open Formula for $\sum \limits_{n=0}^{\infty} \frac{1}{(n+a)!}$ Feb 8 reviewed Close Regression concepts clarified.