User Henry - Mathematics Stack Exchange

22 votes

Curiosity: Wouldn't the definition of the derivative always be 1 if it exists?

answered Dec 13, 2016 at 8:54

21 votes

Accepted

How many circles to cover 2 times bigger circle?

answered Mar 8, 2011 at 14:23

21 votes

Finding the limit of $\frac {n}{\sqrt[n]{n!}}$

answered Mar 22, 2011 at 14:03

21 votes

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Sum of GCD(k,n)

answered Apr 22, 2012 at 16:20

20 votes

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Expected number of rolls to get all sixes

answered Nov 7, 2017 at 20:21

20 votes

Why is a simulation of a probability experiment off by a factor of 10?

answered Oct 29, 2018 at 8:57

19 votes

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Finding the last two digits of a number

answered May 29, 2017 at 7:37

19 votes

How do you create an alternating series with the sign being the same twice in a row?

answered Apr 16, 2016 at 20:52

19 votes

Getting the name of combinatorial problems

answered Sep 4, 2011 at 18:10

19 votes

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How do I find the projection of a point onto a plane

answered Jan 20, 2012 at 14:53

18 votes

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probability distribution of coverage of a set after $X$ independently, randomly selected members of the set

answered Apr 13, 2011 at 17:51

18 votes

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One sided Chebyshev's inequality

answered Oct 1, 2016 at 15:13

17 votes

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Why does the Elo rating system work?

answered Apr 8, 2016 at 8:23

17 votes

An interesting problem with "decomposing" natural numbers.

answered Oct 29, 2020 at 11:26

17 votes

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Good books on Math History

answered Apr 5, 2011 at 8:24

17 votes

how to simplify $\frac{\log_2 625}{\log_2 125}$

answered May 2, 2011 at 9:29

17 votes

Simple paper cuts problem

answered Dec 8, 2014 at 19:35

16 votes

Accepted

What is the complement of conditional probabilities?

answered Sep 27, 2014 at 23:17

16 votes

Does every irrational number contain arbitrarily long sequences of some digit?

answered Sep 4, 2015 at 23:59

16 votes

What is this curve formed by latticing lines from the $x$ and $y$ axes?

answered Nov 24, 2013 at 0:58

16 votes

$ \biggl\lfloor{\frac{x}{1!}\biggr\rfloor} + \biggl\lfloor{\frac{x}{2!}\biggr\rfloor} + \cdots \biggl\lfloor{\frac{x}{10!}\biggr\rfloor}=1001$

answered Feb 4, 2011 at 1:50

16 votes

Odd-Odd-Even-Even Sequence

answered Feb 7, 2012 at 14:51

16 votes

How much math education was typical in the 18th & 19th century?

answered Feb 13, 2012 at 1:25

16 votes

Is there any sequence of closed shapes whose limit tends to the unit circle while the limit of the perimeter goes to infinity?

answered Dec 22, 2023 at 1:03

15 votes

Explain why $E(X) = \int_0^\infty (1-F_X (t)) \, dt$ for every nonnegative random variable $X$

answered Jul 19, 2012 at 17:53

15 votes

Accepted

Notation for the set created from the combination or permutation of a set

answered Mar 21, 2011 at 18:52

15 votes

Accepted

Maximum sum of angles in triangle in sphere

answered Oct 24, 2011 at 23:52

15 votes

Methods for Finding Raw Moments of the Normal Distribution

answered Feb 18, 2021 at 13:21

14 votes

What do you call numbers such as $100, 200, 500, 1000, 10000, 50000$ as opposed to $370, 14, 4500, 59000$

answered Dec 23, 2011 at 10:38

14 votes

Which one result in mathematics has surprised you the most?

answered Mar 14, 2011 at 14:47

Stack Exchange Network

5,856 Answers

Curiosity: Wouldn't the definition of the derivative always be 1 if it exists?

How many circles to cover 2 times bigger circle?

Finding the limit of $\frac {n}{\sqrt[n]{n!}}$

Sum of GCD(k,n)

Expected number of rolls to get all sixes

Why is a simulation of a probability experiment off by a factor of 10?

Finding the last two digits of a number

How do you create an alternating series with the sign being the same twice in a row?

Getting the name of combinatorial problems

How do I find the projection of a point onto a plane

probability distribution of coverage of a set after $X$ independently, randomly selected members of the set

One sided Chebyshev's inequality

Why does the Elo rating system work?

An interesting problem with "decomposing" natural numbers.

Good books on Math History

how to simplify $\frac{\log_2 625}{\log_2 125}$

Simple paper cuts problem

What is the complement of conditional probabilities?

Does every irrational number contain arbitrarily long sequences of some digit?

What is this curve formed by latticing lines from the $x$ and $y$ axes?

$ \biggl\lfloor{\frac{x}{1!}\biggr\rfloor} + \biggl\lfloor{\frac{x}{2!}\biggr\rfloor} + \cdots \biggl\lfloor{\frac{x}{10!}\biggr\rfloor}=1001$

Odd-Odd-Even-Even Sequence

How much math education was typical in the 18th & 19th century?

Is there any sequence of closed shapes whose limit tends to the unit circle while the limit of the perimeter goes to infinity?

Explain why $E(X) = \int_0^\infty (1-F_X (t)) \, dt$ for every nonnegative random variable $X$

Notation for the set created from the combination or permutation of a set

Maximum sum of angles in triangle in sphere

Methods for Finding Raw Moments of the Normal Distribution

What do you call numbers such as $100, 200, 500, 1000, 10000, 50000$ as opposed to $370, 14, 4500, 59000$

Which one result in mathematics has surprised you the most?