Yuval Filmus's user avatar
Yuval Filmus's user avatar
Yuval Filmus's user avatar
Yuval Filmus
  • Member for 13 years, 6 months
  • Last seen this week
285 votes
Accepted

How to study math to really understand it and have a healthy lifestyle with free time?

77 votes
Accepted

Sum of First $n$ Squares Equals $\frac{n(n+1)(2n+1)}{6}$

69 votes

Choose a random number between $0$ and $1$ and record its value. Keep doing it until the sum of the numbers exceeds $1$. How many tries do we need?

65 votes

Why, although these functions have the same derivative, do they not differ by a constant?

51 votes

Order of elements is lcm-closed in abelian groups

45 votes

Comparing $\pi^e$ and $e^\pi$ without calculating them

45 votes

$x^y = y^x$ for integers $x$ and $y$

43 votes

Prime number between $n$ and $n!+1$

38 votes
Accepted

What is the math behind the game Spot It?

36 votes
Accepted

Math Major: How to read textbooks in better style or method ? And how to select best books?

29 votes

Why is an empty function considered a function?

29 votes

How to prove that $\lim\limits_{x\to0}\frac{\sin x}x=1$?

28 votes

Why are algebraic structures preserved under intersection but not union?

27 votes

Which base of numerical system have $\frac 15 = 0.33333\ldots$?

27 votes
Accepted

Mathematical notation for the maximum of a set of function values

27 votes
Accepted

What is the 0-norm?

27 votes

If a 1 meter rope is cut at two uniformly randomly chosen points, what is the average length of the smallest piece?

26 votes

Starting digits of $2^n$.

25 votes

If $R$ and $S$ are rings then $R \times S$ is never a field (or domain)

24 votes
Accepted

Show that the question "Is there life beyond earth?" is decidable

23 votes
Accepted

Does DTIME(O(n)) = REGULAR?

23 votes
Accepted

What is the difference between a predicate and function?

23 votes

What is the difference between the Frobenius norm and the 2-norm of a matrix?

22 votes
Accepted

How do the Catalan numbers turn up here?

22 votes

Examples of patterns that eventually fail

21 votes
Accepted

The characteristic and minimal polynomial of a companion matrix

20 votes
Accepted

Given $a_{1}=1, \ a_{n+1}=a_{n}+\frac{1}{a_{n}}$, find $\lim \limits_{n\to\infty}\frac{a_{n}}{n}$

19 votes
Accepted

What makes a context free grammar ambiguous?

18 votes
Accepted

$\sum \limits_{n=1}^{\infty}n(\frac{2}{3})^n$ Evalute Sum

18 votes
Accepted

If an unary language exists in NPC then P=NP

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