User Jared

138 votes

My son's Sum of Some is beautiful! But what is the proof or explanation?

answered May 29, 2013 at 21:14

91 votes

What is the equation for a 3D line?

answered May 28, 2013 at 3:39

43 votes

Accepted

Can a 2D person walking on a Möbius strip prove that it's on a Möbius strip?

answered Aug 12, 2013 at 7:29

32 votes

Accepted

Find the value of $x^3-x^{-3}$ given that $x^2+x^{-2} = 83$

answered May 16, 2013 at 21:38

26 votes

Accepted

What is "general position" of hyperplanes?

answered Aug 6, 2013 at 20:00

24 votes

How much is $\lceil\frac{1}{\infty}\rceil$?

answered Jul 31, 2013 at 21:29

22 votes

Accepted

Curious Integral Proof

answered Sep 3, 2013 at 3:45

21 votes

about addition and multiplications of real number

answered Aug 11, 2013 at 6:40

21 votes

Accepted

What exactly is a probability measure in simple words?

answered May 7, 2013 at 22:05

20 votes

Accepted

Are irrational numbers completely random?

answered Jul 17, 2013 at 6:09

19 votes

Accepted

Closure of interior of closed set

answered Aug 26, 2013 at 2:40

19 votes

Unique complement of a subspace

answered Sep 2, 2013 at 7:11

17 votes

Accepted

Why must a function have to have even and odd parts

answered Aug 5, 2013 at 6:36

16 votes

map of arbitrary degree from compact oriented manifold into sphere

answered Jul 26, 2013 at 17:28

15 votes

How many special right triangles are there?

answered Jul 24, 2013 at 19:42

15 votes

Accepted

absolutely convergent series and conditionally convergent series rearrangement

answered Jun 7, 2013 at 20:05

15 votes

Accepted

Upper and Lower Triangular Matrices

answered May 24, 2013 at 1:37

14 votes

Accepted

Evaluating the limit of a sequence given by recurrence relation $a_1=\sqrt2$, $a_{n+1}=\sqrt{2+a_n}$. Is my solution correct?

answered Jul 22, 2013 at 17:06

14 votes

Why does $ \frac{2x}{2+x}$ provide a particularly tight lower bound for $\ln(1+x)$ for small positive values of $x$?

answered Jul 20, 2013 at 16:08

14 votes

Accepted

Formula for pentagonal numbers

answered Jul 27, 2013 at 17:23

12 votes

"Question: Show that $n^5 - n$ is divisible by 30; for all natural n"

answered Jul 24, 2013 at 17:38

12 votes

Checking whether a polynomial of high degree is bijective or not.

answered May 10, 2013 at 22:59

12 votes

In what sense is the derivative the "best" linear approximation?

answered May 1, 2013 at 18:35

12 votes

Accepted

9 pirates have to divide 1000 coins...

answered May 6, 2013 at 3:44

12 votes

How to prove that the set of rational numbers are countable?

answered Mar 17, 2013 at 22:43

11 votes

Show that $89|(2^{44})-1$

answered Mar 25, 2014 at 23:53

11 votes

When is a tensor product of two commutative rings noetherian?

answered Mar 23, 2013 at 0:54

11 votes

Accepted

torus by identifying two equivalent points (mod $\mathbb{Z^2}$)

answered Apr 13, 2013 at 17:09

11 votes

How many field homomorphisms?

answered May 28, 2013 at 4:23

11 votes

Proving that ${n}\choose{k}$ $=$ ${n}\choose{n-k}$

answered May 28, 2013 at 3:15

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508 Answers

My son's Sum of Some is beautiful! But what is the proof or explanation?

What is the equation for a 3D line?

Can a 2D person walking on a Möbius strip prove that it's on a Möbius strip?

Find the value of $x^3-x^{-3}$ given that $x^2+x^{-2} = 83$

What is "general position" of hyperplanes?

How much is $\lceil\frac{1}{\infty}\rceil$?

Curious Integral Proof

about addition and multiplications of real number

What exactly is a probability measure in simple words?

Are irrational numbers completely random?

Closure of interior of closed set

Unique complement of a subspace

Why must a function have to have even and odd parts

map of arbitrary degree from compact oriented manifold into sphere

How many special right triangles are there?

absolutely convergent series and conditionally convergent series rearrangement

Upper and Lower Triangular Matrices

Evaluating the limit of a sequence given by recurrence relation $a_1=\sqrt2$, $a_{n+1}=\sqrt{2+a_n}$. Is my solution correct?

Why does $ \frac{2x}{2+x}$ provide a particularly tight lower bound for $\ln(1+x)$ for small positive values of $x$?

Formula for pentagonal numbers

"Question: Show that $n^5 - n$ is divisible by 30; for all natural n"

Checking whether a polynomial of high degree is bijective or not.

In what sense is the derivative the "best" linear approximation?

9 pirates have to divide 1000 coins...

How to prove that the set of rational numbers are countable?

Show that $89|(2^{44})-1$

When is a tensor product of two commutative rings noetherian?

torus by identifying two equivalent points (mod $\mathbb{Z^2}$)

How many field homomorphisms?

Proving that ${n}\choose{k}$ $=$ ${n}\choose{n-k}$