User a little don - Mathematics Stack Exchange

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	2,514 reputation	bio	website	futurebird.com	visits	member for	2 years, 7 months
827 badges		location	New York, NY		seen	20 hours ago

11

33

votes

4

answers

1

kviews

A circle rolls along a parabola

apr 3 at 9:02 J. M. 38.9k

7

20

votes

6

answers

720

views

Why do new rules cause students to forget and misapply older rules?

education

nov 22 at 21:52 Hurkyl 21.5k

2

20

votes

1

answer

430

views

Feeding real or even complex numbers to the integer partition function $p(n)$?

number-theory special-functions partitions

dec 2 '11 at 3:34 J. M. 38.9k

6

19

votes

4

answers

850

views

You are standing at the origin of an “infinite forest” holding an “infinite bb-gun”

number-theory intuition infinity

oct 24 '10 at 17:55 T.. 8,083

13

17

votes

17

answers

2

kviews

Interesting calculus problems of medium difficulty?

calculus algebra-precalculus big-list

15h ago Knights who say Ni 189

1

17

votes

1

answer

385

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Yarn-like functions

differential-geometry riemannian-geometry

may 13 '11 at 1:52 Jan Van lent 81

6

14

votes

2

answers

467

views

doubly periodic functions as tessellations (other than parallelograms)

analysis special-functions tessellations elliptic-functions

apr 2 at 17:19 J. M. 38.9k

3

12

votes

1

answer

230

views

Understanding sub-atomic particles, for mathematicians

reference-request big-list physics

dec 8 '11 at 20:34 Robert Israel 86.4k

6

12

votes

4

answers

553

views

Developing the unit circle in geometries with different metrics: beyond taxi cabs

geometry trigonometry big-list metric-spaces

nov 13 '10 at 18:00 Joseph Malkevitch 3,532

3

10

votes

1

answer

204

views

Mini Mandelbrots, are they exact copies?

complex-analysis fractals

jul 16 '11 at 14:53 Ross Millikan 83.6k

1

9

votes

4

answers

854

views

What is an intermediate definition for a tangent to a curve?

calculus teaching

may 31 '11 at 16:41 Qiaochu Yuan 118k

7

votes

1

answer

247

views

Is there a gamma-like function for the q-factorial?

calculus special-functions gamma-function q-analogs quantum-calculus

oct 4 '11 at 15:12 Sasha 41.4k

7

votes

2

answers

621

views

The determinant is the integral of algebra. The integral is the determinant of analysis

linear-algebra analysis intuition

oct 28 '10 at 17:24 T.. 8,083

1

6

votes

1

answer

138

views

Sunk cost auction modeling.

game-theory mathematical-modeling

may 3 at 15:58 Henry D 40

2

6

votes

2

answers

1

kviews

How many distinct n-letter “words” can be formed from a set of k letters where some of the letters are repeated?

probability combinatorics

feb 10 at 7:12 Community♦ 1

3

6

votes

1

answer

449

views

A simple bijection between $\mathbb{R}$ and $\mathbb{R}^4$ or $\mathbb{R}^n$?

cardinals

mar 22 '12 at 18:32 dtldarek 8,269

6

votes

1

answer

154

views

Why is there a derivative in this formula?

number-theory notation partitions

apr 23 '11 at 0:55 Alon Amit 6,161

6

votes

1

answer

269

views

Generalization of the series for $\frac{\pi^2}{6}$? Is there a more elementary proof?

analysis generating-functions products

apr 16 '11 at 0:43 Carl Brannen 1,386

1

6

votes

2

answers

680

views

I want to graph an equilateral triangle on graph paper

number-theory approximation

oct 23 '10 at 23:52 J. M. 38.9k

5

votes

4

answers

173

views

Calculus one problem about substitution and area

calculus big-list

may 30 '11 at 13:01 Shai Covo 17k

5

votes

3

answers

563

views

The 2nd part of the “Fundamental Theorem of Calculus.”

calculus

apr 7 '11 at 15:25 Pete L. Clark 44.7k

5

votes

1

answer

151

views

Can I draw a net for a Steinmetz solid with a compass?

geometry

dec 20 '10 at 12:31 J. M. 38.9k

3

4

votes

2

answers

507

views

Differential Equations Flow-chart/genealogical diagram?

differential-equations pde

sep 1 at 5:54 doraemonpaul 3,057

2

4

votes

1

answer

72

views

Generating Functions: how do I get my answers in terms of differential operators?

number-theory functions generating-functions

dec 4 '11 at 1:09 Brian M. Scott 155k

4

votes

2

answers

270

views

Is the number of circles in the Apollonian gasket countable?

geometry real-analysis infinity fractals

sep 3 '11 at 14:15 GEdgar 19k

1

4

votes

4

answers

296

views

$f(x) = \frac1{\cos x}$ then $f^{(n)}(x)$ is …?

calculus

aug 7 '11 at 19:03 J. M. 38.9k

2

4

votes

2

answers

314

views

Pictorial representations of the isomorphism theorems

linear-algebra abstract-algebra

jul 25 '11 at 6:53 anon 40.1k

4

votes

3

answers

142

views

Packing powder series, suspect it is easy, yet

calculus sequences-and-series

nov 7 '10 at 5:49 Yuval Filmus 25.9k

2

4

votes

3

answers

730

views

Example of functions where linear dependence isn't obvious

linear-algebra

oct 20 '10 at 18:53 Agustí Roig 8,060

3

votes

2

answers

85

views

Range of a linear transformation on $C[0,1]$

linear-algebra differential-equations

mar 12 '12 at 7:49 Aryabhata 47.6k

a little don

47 Questions