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alex.jordan

Portland, OR

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Top Questions
97 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

87 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

69 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

58 votes

Geometric interpretation for sum of fourth powers

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

44 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

36 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

34 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

33 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

25 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

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

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Top Answers
179
Alternative notation for exponents, logs and roots?
math.stackexchange.com

77
Find five consecutive odd integers such that their sum is $55$.
math.stackexchange.com

65
Find a real function $f:\mathbb{R}\to\mathbb{R}$ such that $f(f(x)) = -x$?
math.stackexchange.com

55
An infinitely powered expression
math.stackexchange.com

55
Can you give an example of a complex math problem that is easy to solve?
math.stackexchange.com

51
Funny identities
math.stackexchange.com

48
Proof the Fibonacci numbers are not a polynomial.
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42
Can a function have two derivatives?
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41
Nice examples of groups which are not obviously groups
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40
Simulate repeated rolls of a 7-sided die with a 6-sided die
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38
How to understand why $x^0 = 1$, where $x$ is any real number?
math.stackexchange.com

38
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
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26
Any neat way to calculate this Vandermonde-like determinant?
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22
How to show that $\det(AB) =\det(A) \det(B)$?
math.stackexchange.com

20
Two paradoxes: $\pi = 2$ and $\sqrt 2 = 2$
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20
How can I unfactorilize number?
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
Once and for all - "Rational numbers" - because of ratio, or because they make sense?
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
Why is a circle 1-dimensional?
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
Why can't you add apples and oranges, but you can multiply and divide them?
math.stackexchange.com

17
Why $\sum_{k=1}^{\infty} \frac{k}{2^k} = 2$?
math.stackexchange.com

17
A hammer and a nail cost $1.10, and the hammer costs one dollar more than the nail. How much does the nail cost?
math.stackexchange.com

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

16
How do I know if my beer is safe to drink?
homebrew.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

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