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alex.jordan

Portland, OR

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Top Questions
87 votes

What's the largest possible volume of a taco, and how do I make one that big?

differential-geometry multivariable-calculus optimization recreational-mathematics calculus-of-variations asked Dec 16 '11 at 5:18
math.stackexchange.com

68 votes

Fractal behavior along the boundary of convergence?

complex-analysis power-series plane-curves fractals asked Nov 23 '11 at 0:22
math.stackexchange.com

64 votes

Regular way to fill a $1\times1$ square with $\frac{1}{n}\times\frac{1}{n+1}$ rectangles?

sequences-and-series visualization egyptian-fractions asked Feb 24 '15 at 23:08
math.stackexchange.com

48 votes

Geometric interpretation for sum of fourth powers

summation proof-without-words asked Nov 21 '12 at 4:10
math.stackexchange.com

42 votes

How to respond to “solve this equation” in a basic algebra class

algebra textbooks asked Apr 7 '17 at 16:17
matheducators.stackexchange.com

35 votes

How to respond to “solve this equation” in a basic algebra class

algebra-precalculus education asked Jul 16 '13 at 3:01
math.stackexchange.com

30 votes

Is there an easy way to add hover text to all incidents of math mode where the hover text would contain the LaTeX code?

math-mode teaching accessibility asked Oct 22 '11 at 3:05
tex.stackexchange.com

26 votes

Examples of Taylor series with interesting convergence along the boundary of convergence?

calculus complex-analysis convergence asked Nov 17 '11 at 0:33
math.stackexchange.com

23 votes

Are there always singularities at the edge of a disk of convergence?

calculus sequences-and-series complex-analysis convergence taylor-expansion asked Jun 24 '11 at 6:06
math.stackexchange.com

23 votes

Do we know anything about what a clock face would look like in Middle Earth?

tolkien middle-earth asked Jul 14 '15 at 2:43
scifi.stackexchange.com

1 2 3

Top Answers
119
Alternative notation for exponents, logs and roots?
math.stackexchange.com

76
Find five consecutive odd integers such that their sum is $55$.
math.stackexchange.com

55
An infinitely powered expression
math.stackexchange.com

53
Find a real function $f:\mathbb{R}\to\mathbb{R}$ such that $f(f(x)) = -x$?
math.stackexchange.com

52
Can you give an example of a complex math problem that is easy to solve?
math.stackexchange.com

46
Proof the Fibonacci numbers are not a polynomial.
math.stackexchange.com

42
Can a function have two derivatives?
math.stackexchange.com

40
Simulate repeated rolls of a 7-sided die with a 6-sided die
math.stackexchange.com

40
Funny identities
math.stackexchange.com

37
How to understand why $x^0 = 1$, where $x$ is any real number?
math.stackexchange.com

30
Nice examples of groups which are not obviously groups
math.stackexchange.com

30
Nice examples of groups which are not obviously groups
math.stackexchange.com

27
Prove that 17 divides 1111111111111111 (16 1's) and doesn't divide 11111111
math.stackexchange.com

25
Any neat way to calculate this Vandermonde-like determinant?
math.stackexchange.com

20
How can I unfactorilize number?
math.stackexchange.com

19
Two paradoxes: $\pi = 2$ and $\sqrt 2 = 2$
math.stackexchange.com

19
What is a mathematical expression for the sequence $\{1,1,-1,-1,1,1,-1,-1,\dots\}$?
math.stackexchange.com

19
Continuous $f$ with $f(0)=1$ and $\int_0^1 f(x) dx = \int_0^1 xf(x) dx = \int_0^1 x^2f(x) dx = 0$?
math.stackexchange.com

18
How to show that $\det(AB) =\det(A) \det(B)$?
math.stackexchange.com

18
Can a nonzero polynomial evaluate to the zero function in a suitable infinite ring of char 0?
math.stackexchange.com

18
Once and for all - “Rational numbers” - because of ratio, or because they make sense?
math.stackexchange.com

17
Is it faster to count to the infinite going one by one or two by two?
math.stackexchange.com

17
Why can't you add apples and oranges, but you can multiply and divide them?
math.stackexchange.com

16
Why is a circle 1-dimensional?
math.stackexchange.com

16
Does a non-trivial solution exist for $f'(x)=f(f(x))$?
math.stackexchange.com

16
Prove the inequality $\,\frac{1}{\sqrt{1}+ \sqrt{3}} +\frac{1}{\sqrt{5}+ \sqrt{7} }+\ldots+\frac{1}{\sqrt{9997}+\sqrt{9999}}\gt 24$
math.stackexchange.com

16
The general term of the sequence : 1, 1, -1, -1, 1, 1, …?
math.stackexchange.com

15
How do I know if my beer is safe to drink?
homebrew.stackexchange.com

15
integrate square of $\arctan x$. Tricky
math.stackexchange.com

15
Why $\sum_{k=1}^{\infty} \frac{k}{2^k} = 2$?
math.stackexchange.com

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