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Mathematics
Martin R's user avatar
Martin R's user avatar
Martin R's user avatar
Martin R
  • Member for 11 years, 9 months
  • Last seen this week
  • Germany
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159
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
75
Taylor series for $\sqrt{x}$?
Jan 16, 2015
38
Is this proof for divergence of harmonic series rigorous? Can it be made so?
Jan 21
30
What are the coefficients in the expansion of $(x+y)(x+2y) \cdots (x+ny)$?
Nov 7, 2018
28
How to prove that adding $n$ to the numerator and denominator will move the resultant fraction close to $1$?
Feb 6, 2019
28
Is the AM-GM inequality the only obstruction for getting a specific sum and product?
May 3, 2020
25
How large must $f(f(z))-z^2$ be in the unit disk?
Aug 5, 2021
22
Are balls around a point always symmetric about the axes?
Jul 27, 2020
22
Help to understand the generalization of the Argument Principle
May 29, 2016
Top Meta posts
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35
Do we want accepted answers unpinned on Math.SE?
30
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?
22
How to see questions time line?
Top network posts
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1002
How to check if an element is in an array
852
How do I concatenate or merge arrays in Swift?
679
What is the 'open' keyword in Swift?
587
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