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Mathematics
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Martin R's user avatar
Martin R's user avatar
Martin R
  • Member for 12 years, 7 months
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  • Germany
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163
Why does this matrix give the derivative of a function?
Nov 22, 2015
88
If a two variable smooth function has two global minima, will it necessarily have a third critical point?
Feb 13, 2021
79
Taylor series for $\sqrt{x}$?
Jan 16, 2015
39
Is this proof for divergence of harmonic series rigorous? Can it be made so?
Jan 21, 2024
30
What are the coefficients in the expansion of $(x+y)(x+2y) \cdots (x+ny)$?
Nov 7, 2018
29
How large must $f(f(z))-z^2$ be in the unit disk?
Aug 5, 2021
28
Is there a $f: \mathbb{N} \to \mathbb{N}$ such that $\sum_{n=1}^{\infty} \frac{1}{n^2f(n)} \in \mathbb{Q}$?
Jan 3
28
Is the AM-GM inequality the only obstruction for getting a specific sum and product?
May 3, 2020
28
How to prove that adding $n$ to the numerator and denominator will move the resultant fraction close to $1$?
Feb 6, 2019
27
About the inequality $\sum \frac{x_j}{1-x_j} \sum \frac{y_j}{1-y_j} \ge \sum \frac{x_j}{1-y_j} \sum \frac{y_j}{1-x_j}$
Apr 20
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Do we want accepted answers unpinned on Math.SE?
34
What Should I Do if I Found a Simpler Approach to a Question Elsewhere(Other than MSE)?
31
Are questions caused by typographical errors in a textbook on-topic?
23
Adding MathJax to the title of posts being edited - bad habit?
23
How many people voted in the 2021 Moderator Election?
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1006
How to check if an element is in an array
857
How do I concatenate or merge arrays in Swift?
681
What is the 'open' keyword in Swift?
600
How to provide a localized description with an Error type in Swift?
484
Objective-C implicit conversion loses integer precision 'NSUInteger' (aka 'unsigned long') to 'int' warning