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Justin L.'s user avatar
Justin L.'s user avatar
Justin L.'s user avatar
Justin L.
  • Member for 13 years, 11 months
  • Last seen more than a month ago
282 votes
20 answers
58k views

Conjectures that have been disproved with extremely large counterexamples?

109 votes
13 answers
62k views

Why is "the set of all sets" a paradox, in layman's terms?

86 votes
11 answers
26k views

Logic problem: Identifying poisoned wines out of a sample, minimizing test subjects with constraints

61 votes
17 answers
18k views

Intuitive understanding of the derivatives of $\sin x$ and $\cos x$

40 votes
8 answers
13k views

Is there possibly a largest prime number?

39 votes
14 answers
58k views

Derivation of the formula for the vertex of a parabola

37 votes
5 answers
68k views

Compass-and-straightedge construction of the square root of a given line?

32 votes
1 answer
34k views

Probability of a point taken from a certain normal distribution will be greater than a point taken from another?

32 votes
2 answers
3k views

Why is the decimal representation of $\frac17$ "cyclical"?

30 votes
5 answers
106k views

When you randomly shuffle a deck of cards, what is the probability that it is a unique permutation never before configured?

29 votes
6 answers
32k views

Can non-linear transformations be represented as Transformation Matrices?

24 votes
3 answers
16k views

Geometric interpretation of the multiplication of complex numbers?

22 votes
2 answers
38k views

How many circles of a given radius can be packed into a given rectangular box?

20 votes
4 answers
2k views

Why is the matrix-defined Cross Product of two 3D vectors always orthogonal?

20 votes
1 answer
1k views

What property of certain regular polygons allows them to be faces of the Platonic Solids?

19 votes
7 answers
29k views

Why are the differences between consecutive squares equal to the sequence of odd numbers?

16 votes
4 answers
3k views

Intuitive reasoning behind the Chain Rule in multiple variables?

15 votes
9 answers
12k views

What is larger -- the set of all positive even numbers, or the set of all positive integers?

15 votes
5 answers
13k views

Are there any functions that are (always) continuous yet not differentiable? Or vice-versa?

14 votes
5 answers
1k views

Why does this process, when iterated, tend towards a certain number? (the golden ratio?)

14 votes
6 answers
19k views

What does it mean to be going 40 mph (or 64 kph, etc.) at a given moment?

13 votes
1 answer
2k views

Why does the log-log scale on my Slide Rule work?

12 votes
2 answers
4k views

Generalizations of the number theory concepts of "even" and "odd"?

12 votes
2 answers
17k views

Finding Moment of Inertia (Rotational Inertia?) $I$ Using Integration?

7 votes
2 answers
1k views

Question about the nature of coordinate systems

5 votes
1 answer
298 views

Is the set of all unique (convex) polygons countable? If so, by what bijection to the natural numbers?

4 votes
2 answers
931 views

Why are only singly and doubly ruled non-planar surfaces found? Why not triply ruled?

3 votes
4 answers
204 views

Given a metric function between a set of abstract points, what is the best way to plot them on a 2D space?

2 votes
2 answers
205 views

If I wanted something to decay with a half-life of $n$ days, what should I multiply it by every day?

2 votes
1 answer
1k views

Using differential equations to graph velocity over time of a falling object subject to wind resistance