Haskell Curry's user avatar
Haskell Curry's user avatar
Haskell Curry's user avatar
Haskell Curry
  • Member for 11 years, 7 months
  • Last seen more than 11 years ago
111 votes

Discontinuous derivative.

98 votes
Accepted

Given a group $ G $, how many topological/Lie group structures does $ G $ have?

65 votes
Accepted

Multiples of an irrational number forming a dense subset

48 votes

How to prove that $ \text{int}(\text{cl}(A)) = \text{cl}(\text{int}(A)) $?

43 votes
Accepted

Gelfand-Naimark Theorem

39 votes
Accepted

Is the Nash Embedding Theorem a special case of the Whitney Embedding Theorem?

37 votes
Accepted

Is every function with the intermediate value property a derivative?

36 votes

Examples of non-measurable sets in $\mathbb{R}$

36 votes
Accepted

Computing the Expectation of the Square of a Random Variable: $ \text{E}[X^{2}] $.

35 votes

Semi-Norms and the Definition of the Weak Topology

29 votes
Accepted

Is the set of real numbers the largest possible totally ordered set?

28 votes
Accepted

Axiomatic characterization of the rational numbers

24 votes

Polynomial with infinitely many zeros.

23 votes
Accepted

Is $ \frac{\mathrm{d}{x}}{\mathrm{d}{y}} = \frac{1}{\left( \frac{\mathrm{d}{y}}{\mathrm{d}{x}} \right)} $?

22 votes
Accepted

Problem from Herstein on group theory

21 votes
Accepted

Book on Measure Theoretic Statistics

20 votes

Is composition of measurable functions measurable?

19 votes

Involutions and Abelian Groups

18 votes
Accepted

Importance of Toeplitz operators?

17 votes

$\tan(x) = x$. Find the values of $x$

17 votes

Find a real function $f:\mathbb{R}\to\mathbb{R}$ such that $f(f(x)) = -x$?

16 votes

On Ph.D. Qualifying Exams

16 votes
Accepted

An idempotent operator is compact if and only if it is of finite rank

16 votes
Accepted

Inequality on the side lengths of a triangle: $\left| \frac{a}{b} + \frac{b}{c} + \frac{c}{a} - \frac{a}{c} - \frac{b}{a} - \frac{c}{b} \right| < 1$.

15 votes

Trigonometric Inequality. $\sin{1}+\sin{2}+\ldots+\sin{n} <2$ .

15 votes

An example of a bounded countably infinite subset of the real numbers.

14 votes
Accepted

Applications of model theory to analysis

14 votes
Accepted

Making a standard theoretical physics argument rigorous

13 votes
Accepted

Weak convergence in reflexive Banach space

13 votes
Accepted

Boundedness of a continuous linear functional on a topological vector space

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