alex.jordan

Portland, OR

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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, 2011 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, 2015 at 23:08

math.stackexchange.com

71 votes

Fractal behavior along the boundary of convergence?

complex-analysis power-series plane-curves fractals asked Nov 23, 2011 at 0:22

math.stackexchange.com

58 votes

Geometric interpretation for sum of fourth powers

summation proof-without-words asked Nov 21, 2012 at 4:10

math.stackexchange.com

45 votes

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

algebra textbooks asked Apr 7, 2017 at 16:17

matheducators.stackexchange.com

38 votes

How to respond to "solve this equation" in a basic algebra class

algebra-precalculus education asked Jul 16, 2013 at 3:01

math.stackexchange.com

36 votes

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

calculus complex-analysis convergence asked Nov 17, 2011 at 0:33

math.stackexchange.com

34 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, 2011 at 3:05

tex.stackexchange.com

26 votes

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

tolkien middle-earth asked Jul 14, 2015 at 2:43

scifi.stackexchange.com

25 votes

Shortcut to declare alignment of many columns in a table

tables horizontal-alignment asked Jul 21, 2014 at 19:13

tex.stackexchange.com

Top Answers

189

Alternative notation for exponents, logs and roots?

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Find five consecutive odd integers such that their sum is $55$.

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

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

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An infinitely powered expression

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Funny identities

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Proof the Fibonacci numbers are not a polynomial.

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Nice examples of groups which are not obviously groups

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Can a function have two derivatives?

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Simulate repeated rolls of a 7-sided die with a 6-sided die

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How to understand why $x^0 = 1$, where $x$ is any real number?

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Nice examples of groups which are not obviously groups

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Any neat way to calculate this Vandermonde-like determinant?

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Prove that 17 divides 1111111111111111 (16 1's) and doesn't divide 11111111

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How to show that $\det(AB) =\det(A) \det(B)$?

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Two paradoxes: $\pi = 2$ and $\sqrt 2 = 2$

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How can I unfactorilize number?

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What is a mathematical expression for the sequence $\{1,1,-1,-1,1,1,-1,-1,\dots\}$?

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Once and for all - "Rational numbers" - because of ratio, or because they make sense?

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Can a nonzero polynomial evaluate to the zero function in a suitable infinite ring of char 0?

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Continuous $f$ with $f(0)=1$ and $\int_0^1 f(x) dx = \int_0^1 xf(x) dx = \int_0^1 x^2f(x) dx = 0$?

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Why is a circle 1-dimensional?

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Why $\sum_{k=1}^{\infty} \frac{k}{2^k} = 2$?

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Why can't you add apples and oranges, but you can multiply and divide them?

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Is it faster to count to the infinite going one by one or two by two?

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

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

homebrew.stackexchange.com

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

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Does a non-trivial solution exist for $f'(x)=f(f(x))$?

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The general term of the sequence : 1, 1, -1, -1, 1, 1, ...?

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