User Joe Johnson 126 - Mathematics Stack Exchange

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	5,482 reputation	bio	website		visits	member for	2 years, 6 months
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6

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Sum of the squares of the reciprocals of the fixed points of the tangent function

apr 10 '12 at 2:45 Michael Hardy 47.6k

3

18

votes

3

answers

374

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When L'Hôpital's Rule Fails

calculus limit

apr 16 at 6:47 Dennis Gulko 10.1k

3

votes

5

answers

355

views

How to interpret material conditional and explain it to freshmen?

logic soft-question philosophy

apr 29 at 1:00 Keith Allpress 1

1

8

votes

1

answer

343

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Undergrad Student Trying to Figure Out What to Study

soft-question education self-learning

apr 23 '12 at 22:11 EMS 1,139

7

13

votes

2

answers

306

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Atiyah's definitions of Topological Quantum Field Theory

category-theory field-theory physics quantum-field-theory

apr 9 '12 at 13:35 oen 7,338

3

9

votes

6

answers

303

views

Is a function that has a vertical tangent line a function?

calculus

apr 1 at 2:41 anorton 3,847

1

12

votes

2

answers

295

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Why isn't $ SA_{\text{cube}} = 3x^2 $?

geometry

jun 16 '11 at 23:29 amWhy 53.6k

6

9

votes

3

answers

289

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What is category theory useful for?

soft-question category-theory

feb 24 at 6:46 Rahul Narain 16.9k

2

4

votes

4

answers

286

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The relation between logic and algebra.

abstract-algebra logic

sep 22 at 19:27 RParadox 253

4

10

votes

2

answers

284

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Homotopy pushouts and induced maps

algebraic-topology category-theory homotopy-theory

oct 5 '11 at 15:26 Agustí Roig 8,060

2

5

votes

3

answers

276

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What Is The Limit Of The Sequence: $\frac{n^3}{{((3n)!)^\frac{1}{n}}}$

homework calculus real-analysis sequences-and-series

apr 13 '12 at 15:21 Aryabhata 47.4k

10

16

votes

2

answers

242

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Qual question archives?

reference-request soft-question

nov 11 '11 at 18:47 Willie Wong♦ 30.6k

9

21

votes

2

answers

230

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If $S \times \Bbb{R}^k$ is homeomorphic to $T \times \Bbb{R}^k$ and $S$ is compact, can we conclude that $T$ is compact?

general-topology

4h ago George Lowther 11.4k

1

3

votes

0

answers

225

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Looking for discrete math research topics for undergraduates

soft-question discrete-mathematics undergraduate-research

jan 9 at 15:04 Matt Pressland 5,359

3

5

votes

2

answers

210

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Complex differentiabilty

complex-analysis

feb 8 '11 at 13:19 wildildildlife 2,840

2

7

votes

1

answer

209

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A modern textbook on affine and projective spaces

geometry reference-request projective-geometry

oct 25 '11 at 12:53 Georges Elencwajg 44.7k

2

5

votes

2

answers

158

views

Do students understand infinite series before they're informally introduced?

calculus sequences-and-series teaching

dec 12 at 14:39 Thomas 10.8k

2

5

votes

1

answer

147

views

Why does Frank Adams demand a finite CW-complex?

algebraic-topology category-theory homotopy-theory

oct 14 '11 at 0:29 Tyler Lawson 866

2

1

vote

2

answers

140

views

Does the concept of infinity have any practical applications?

infinity applications

jan 26 at 22:29 Asaf Karagila 89.9k

2

votes

1

answer

119

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Non-vanishing of homology of loop spaces

algebraic-topology loop-spaces

oct 25 '11 at 21:04 Community♦ 1

1

0

votes

1

answer

106

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Why cellular maps induce maps of chain complexes?

algebraic-topology

oct 4 '11 at 2:00 Mariano Suárez-Alvarez♦ 53k

2

3

votes

2

answers

94

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cohomology of an exact sequence

homological-algebra cohomology

nov 8 at 22:10 Julian Kuelshammer 3,625

1

4

votes

0

answers

92

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Using other fields of math to simplify a proof.

proof-strategy math-history

jan 23 at 15:22 DoctorBatmanGod 2,440

1

2

votes

1

answer

92

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Cohomology of Grassmannian

algebraic-topology cohomology

jan 22 at 0:01 Henry T. Horton 7,419

2

6

votes

1

answer

90

views

Ways to think about vector bundle

differential-geometry manifolds vector-bundles

mar 27 at 1:05 Henry T. Horton 7,419

2

4

votes

1

answer

79

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Fibonnaci Sequence and series limits

sequences-and-series fibonacci-numbers

jan 18 at 0:23 Mike Spivey 25.8k

1

4

votes

1

answer

75

views

Interpretation of eigenvectors of cross product

eigenvectors rotations cross-product

may 10 at 13:20 Mårten W 889

1

2

votes

1

answer

69

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Theory of Equations and Undergraduate Mathematics

soft-question education

jan 21 at 0:00 Joe Johnson 126 5,482

2

6

votes

1

answer

64

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What theorems/examples will make me really understand representation theory?

reference-request representation-theory

feb 12 at 14:02 Tobias Kildetoft 4,513

1

2

votes

0

answers

39

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Divergence and curl united?

differential-geometry multivariable-calculus

apr 10 at 0:18 AbstractDissonance 332

Joe Johnson 126

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