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jds
  • Member for 9 years, 5 months
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94 votes
24 answers
14k views

What is a real-world metaphor for irrational numbers?

23 votes
4 answers
6k views

Counting numbers in a sequence - explain "Add $1$ before you're done" rule

18 votes
10 answers
5k views

Can a proof be just words?

11 votes
3 answers
18k views

Are there 3 or 4 quartiles? 99 or 100 percentiles?

8 votes
6 answers
15k views

What does it mean that multiplication and division have the same precedence?

8 votes
0 answers
49 views

Voice-based software for doing mathematics

5 votes
2 answers
6k views

How is there a bijection between an infinite set and a proper subset?

4 votes
1 answer
703 views

GRE General - How to get faster at basic math?

4 votes
1 answer
271 views

Question about SVD proof from Trefethen and Bau

4 votes
1 answer
282 views

Conditional expectation from joint distribution

4 votes
4 answers
6k views

Uniformly at random, break a unit stick in two places. What is the probability that the smallest piece is $\leq 1/5$?

4 votes
1 answer
258 views

My simulation of the Central Limit Theorem does not converge to correct value

3 votes
1 answer
4k views

Notation in the derivative of the hinge loss function

3 votes
1 answer
4k views

Derivation of derivative of multivariate Gaussian w.r.t. covariance matrix

3 votes
4 answers
1k views

Why can't a Venn diagram constitute a proof?

2 votes
4 answers
705 views

What if not connectedness defines a graph?

2 votes
1 answer
1k views

Division and multiplication – reordering operands and operations

2 votes
1 answer
126 views

In a math course, what question should I ask when I am completely confused? [closed]

2 votes
0 answers
50 views

Solving for a stationary point of a multivariate Gaussian parameter (CCA)

2 votes
1 answer
1k views

If a line that intersects a hyperbola exactly once, is it tangent?

2 votes
0 answers
158 views

Why does this numerical overflow error result in vectors with smaller sums?

2 votes
2 answers
722 views

Expectation of sum of geometric random variables vs. expectation of Pascal r.v.

2 votes
1 answer
104 views

Matrix/vector sizes in proof of Denton, Parke, Tao, Zhan eigenvector/eigenvalue result

1 vote
0 answers
29 views

What does this parentheses notation mean, $i = 1(1)k$?

1 vote
1 answer
201 views

Negative and positive skewness: why are these names backwards?

1 vote
0 answers
76 views

Solving for $X$ using the SVD of $QX$ when $Q$ is orthogonal

1 vote
1 answer
79 views

What is the difference between $dx/x$ and $d(\log x)$?

1 vote
0 answers
22 views

Limit equality when deriving the normal distribution from Brownian motion

1 vote
0 answers
24 views

Efficient scalar update to matrix inverse

1 vote
1 answer
33 views

Estimate bias of perturbed Bernoulli process