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Isaac
  • Member for 12 years, 1 month
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72 votes
10 answers
40k views

Proving that $1$- and $2D$ simple symmetric random walks return to the origin with probability $1$

58 votes
12 answers
71k views

Sum of the alternating harmonic series $\sum_{k=1}^{\infty}\frac{(-1)^{k+1}}{k} = \frac{1}{1} - \frac{1}{2} + \cdots $

45 votes
7 answers
3k views

Bad Fraction Reduction That Actually Works

34 votes
11 answers
14k views

Mandelbrot-like sets for functions other than $f(z)=z^2+c$?

32 votes
2 answers
15k views

Probability that a stick randomly broken in two places can form a triangle

25 votes
15 answers
7k views

Useful examples of pathological functions

22 votes
2 answers
8k views

Circular permutations with indistinguishable objects

21 votes
3 answers
2k views

Birthday-coverage problem

20 votes
2 answers
4k views

What is the best way to solve an equation involving multiple absolute values?

19 votes
1 answer
169k views

Solving Triangles (finding missing sides/angles given 3 sides/angles)

15 votes
4 answers
11k views

Is "locally linear" an appropriate description of a differentiable function?

14 votes
1 answer
2k views

What is the standard interpretation of order of operations for the basic arithmetic operations?

11 votes
4 answers
873 views

Describe the locus in the complex plane of the zeros of a quartic polynomial as the constant term varies

6 votes
5 answers
2k views

Least wasteful use of stamps to achieve a given postage

6 votes
5 answers
3k views

Usefulness of Conic Sections

5 votes
3 answers
2k views

How to determine arc measures from angles between secant and tangents (without trigonometry)

5 votes
1 answer
3k views

Proving the Shoelace Method at the Precalculus Level

5 votes
4 answers
1k views

What transformations of the plane are geometrically constructable (compass & straight edge)?

5 votes
6 answers
3k views

Why, conceptually, do limaçons $r=a+b\cos\theta$ have dimples when $|\frac{a}{b}|<2$?

2 votes
1 answer
158 views

Solving inequalities comparing $f(x)$ to $0$ where $f$ is an elementary function