User Hiperion - Mathematics Stack Exchange

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visits	member for	1 year, 11 months
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	590 reputation	bio	website		visits	member for	1 year, 11 months
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Probability of getting two black balls

probability

sep 19 at 16:58 Cameron Buie 27.5k

1

vote

2

answers

497

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Continuous function and open set

general-topology

sep 9 '11 at 6:12 Hiperion 590

1

2

votes

3

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366

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No invertible matrix

linear-algebra

apr 30 '12 at 16:57 rschwieb 20.8k

9

votes

2

answers

362

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Eigenvector of magic square

linear-algebra magic-square

jul 26 at 19:55 MJD 20.8k

1

vote

1

answer

312

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Find a unitary matrix $P$ such that $P^*AP$ is diagonal

linear-algebra

oct 22 at 15:25 copper.hat 28.5k

4

votes

5

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238

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An operator $T:\mathbb{R}^4\to \mathbb{R}^4$ such that $T$ has no (real) eigenvalues.

linear-algebra

aug 27 at 9:51 BenjaLim 16.8k

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5

votes

1

answer

230

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Eigenvalue of a polynomial evaluated in a operator

linear-algebra

aug 28 at 13:55 Community♦ 1

3

votes

1

answer

220

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Continuous function on metric space

general-topology metric-spaces

jun 4 '12 at 16:30 copper.hat 28.5k

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3

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1

answer

203

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idempotent matrix and Jordan form

linear-algebra

mar 23 '12 at 15:11 Arturo Magidin 158k

1

vote

2

answers

198

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Archimedes and center of gravity of an triangle

geometry

sep 13 '11 at 6:41 anon 39.8k

2

votes

2

answers

188

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Topology: Connected set

general-topology

aug 17 '11 at 16:05 Hiperion 590

1

vote

1

answer

165

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Closed set in a Hausdorff topological space [duplicate]

general-topology

jul 19 at 14:39 Nate Eldredge 22.4k

3

votes

1

answer

152

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Why the spectral theorem is named “spectral theorem”?

linear-algebra

oct 22 at 7:24 DarenW 233

3

votes

1

answer

147

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Union of topologies

general-topology

apr 16 '12 at 8:24 Martin Sleziak 20.3k

1

vote

2

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146

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Usual topology and Heine Borel theorem

general-topology

jul 14 at 21:56 Francis Adams 811

1

3

votes

1

answer

137

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Basic topology: Open set

general-topology

dec 7 '11 at 15:43 Andrew 535

1

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0

answers

133

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Hairy ball theorem: references to applications

reference-request differential-topology topological-vector-spaces geometric-topology

jun 12 '12 at 19:44 Hiperion 590

1

vote

2

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132

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Limit in two variables

calculus limit

aug 27 '11 at 23:20 Did 102k

0

votes

1

answer

128

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Partial derivatives and differentiable function

calculus

sep 20 '11 at 20:26 Arturo Magidin 158k

2

votes

2

answers

127

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Jordan Form of a matrix

linear-algebra matrices

oct 20 at 8:43 Gerry Myerson 85.8k

1

vote

1

answer

114

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Partial derivatives, directional derivatives and differentiability of a function

calculus

sep 12 '11 at 16:34 Srivatsan 15.6k

2

3

votes

1

answer

107

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row operations, swapping rows

linear-algebra

apr 9 '12 at 17:52 David Mitra 41k

3

votes

1

answer

106

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Division of a matrix polynomial

linear-algebra

apr 8 '12 at 9:43 Marc van Leeuwen 23.8k

3

votes

2

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104

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Not bijective isometry

linear-algebra

nov 5 at 12:24 Brett Frankel 5,346

4

votes

1

answer

98

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Area in polar coordinates

calculus integration definite-integral

jun 5 '12 at 15:30 Joe 3,060

1

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2

answers

97

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Orthogonal basis for a matrix

linear-algebra

dec 12 at 16:09 user108903 895

2

votes

1

answer

92

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Differentiable function?

calculus

sep 12 '11 at 0:18 t.b. 43.1k

2

votes

1

answer

82

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Hypothesis test: Type I error

probability statistics

nov 21 at 1:35 André Nicolas 161k

0

votes

1

answer

64

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Basic Probability: activities

probability teaching

oct 25 at 15:51 Robert Israel 86.3k

2

votes

1

answer

59

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Hilbert basis of vector space

linear-algebra analysis functional-analysis

nov 29 at 18:14 Norbert 20k

Hiperion

38 Questions