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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.