User DanielWainfleet - Mathematics Stack Exchange

28 votes

Accepted

Preimage of a compact set

answered Oct 28, 2016 at 6:19

17 votes

Limit question - L'Hopital's rule doesn't seem to work

answered Jun 9, 2017 at 8:29

15 votes

Why does 'The King Property' of integration work?

answered Oct 8, 2020 at 16:15

13 votes

Proving $x^4+y^4=z^2$ has no integer solutions

answered Jan 8, 2017 at 9:50

13 votes

Find $n$, where its factorial is a product of factorials

answered Sep 18, 2015 at 4:35

13 votes

Accepted

Is it possible to interchange order of supremum and supremum?

answered Apr 9, 2016 at 8:08

12 votes

Different sizes of infinity

answered Jun 18, 2016 at 3:26

12 votes

Different Approaches for Introducing Elementary Functions

answered Jan 1, 2016 at 14:59

12 votes

Two metric space with same Cauchy sequences

answered Nov 3, 2016 at 5:43

11 votes

Why do I get one extra wrong solution when solving $2-x=-\sqrt{x}$?

answered Jan 20, 2016 at 17:15

11 votes

What are some things we can prove they must exist, but have no idea what they are?

answered Sep 27, 2015 at 2:05

10 votes

Sequential Continuity does not imply Continuity

answered Sep 30, 2015 at 1:05

10 votes

Examples of problems that are easier in the infinite case than in the finite case.

answered Aug 10, 2016 at 2:31

10 votes

How to show that the set of open balls with rational centres and rational radii form a countable base for $\mathbb{R}^n$?

answered Sep 13, 2016 at 6:32

9 votes

Accepted

How is it that there are 'gaps' in rational numbers and yet between any two rational numbers, there exists another rational number?

answered Jan 7, 2019 at 11:43

9 votes

Why is belonging not transitive?

answered Sep 14, 2019 at 2:53

9 votes

What are some examples of when Mathematics 'accidentally' discovered something about the world?

answered Mar 23, 2017 at 13:09

9 votes

Where does a Topology student go after Munkres?

answered Aug 3, 2017 at 19:20

9 votes

Space of Lipschitz Functions Complete?

answered Dec 21, 2015 at 5:27

8 votes

Accepted

Dependence of the equation $a+1=a$ for infinite cardinals $a$ on the axiom of choice

answered May 7 at 0:57

8 votes

What seemingly innocuous results in mathematics require advanced proofs?

answered Aug 17, 2017 at 8:40

8 votes

Proving that $x \mapsto \frac1x$ is convex (without differentiating)

answered Jan 22, 2016 at 10:52

8 votes

Is it true that $0.999999999\ldots=1$?

answered Jul 16, 2015 at 5:37

8 votes

Accepted

Evaluating $\int _{-100}^{100}\lfloor {x^3}\rfloor \,dx$

answered Jul 2, 2016 at 16:40

8 votes

Accepted

How do I calculate $\lim_{n\to \infty} \frac{\ln(n)}{\ln(n+1)}$?

answered Mar 12, 2016 at 5:54

8 votes

What are some counter-intuitive results in mathematics that involve only finite objects?

answered Dec 6, 2016 at 1:29

7 votes

Accepted

Behavior of $\sum a_n x^n$ given $\sum |a_n - a_{n-1}| < \infty$

answered Sep 15, 2017 at 5:00

7 votes

Accepted

Alternating Series Test Proof

answered Mar 30, 2018 at 16:08

7 votes

Applications of complex numbers to solve non-complex problems

answered Dec 29, 2016 at 18:29

7 votes

Set of limit points is closed in a general topological space

answered Jan 27, 2017 at 20:42

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4,166 Answers

Preimage of a compact set

Limit question - L'Hopital's rule doesn't seem to work

Why does 'The King Property' of integration work?

Proving $x^4+y^4=z^2$ has no integer solutions

Find $n$, where its factorial is a product of factorials

Is it possible to interchange order of supremum and supremum?

Different sizes of infinity

Different Approaches for Introducing Elementary Functions

Two metric space with same Cauchy sequences

Why do I get one extra wrong solution when solving $2-x=-\sqrt{x}$?

What are some things we can prove they must exist, but have no idea what they are?

Sequential Continuity does not imply Continuity

Examples of problems that are easier in the infinite case than in the finite case.

How to show that the set of open balls with rational centres and rational radii form a countable base for $\mathbb{R}^n$?

How is it that there are 'gaps' in rational numbers and yet between any two rational numbers, there exists another rational number?

Why is belonging not transitive?

What are some examples of when Mathematics 'accidentally' discovered something about the world?

Where does a Topology student go after Munkres?

Space of Lipschitz Functions Complete?

Dependence of the equation $a+1=a$ for infinite cardinals $a$ on the axiom of choice

What seemingly innocuous results in mathematics require advanced proofs?

Proving that $x \mapsto \frac1x$ is convex (without differentiating)

Is it true that $0.999999999\ldots=1$?

Evaluating $\int _{-100}^{100}\lfloor {x^3}\rfloor \,dx$

How do I calculate $\lim_{n\to \infty} \frac{\ln(n)}{\ln(n+1)}$?

What are some counter-intuitive results in mathematics that involve only finite objects?

Behavior of $\sum a_n x^n$ given $\sum |a_n - a_{n-1}| < \infty$

Alternating Series Test Proof

Applications of complex numbers to solve non-complex problems

Set of limit points is closed in a general topological space