User Arjang - Mathematics Stack Exchange

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	2,438 reputation	bio	website		visits	member for	2 years, 5 months
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6

votes

1

answer

87

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Why substitution method does not work for $\int (x-\frac{1}{2x} )^2\, \mathrm dx$?

integration problem-solving

8h ago Sharkos 4,160

3

6

votes

5

answers

112

views

Strong characterization of $\mathbb C$ with respect to $\mathbb R$

abstract-algebra

2d ago snarski 308

1

2

votes

3

answers

136

views

$2^n-3^m=1 , m,n \in \mathbb N =?$

elementary-number-theory recreational-mathematics

may 12 at 17:56 Gottfried Helms 7,150

1

2

votes

1

answer

116

views

$\log_{2}{3} > \log_{3}{5}$?

inequality

may 9 at 10:12 A. Bellmunt 287

0

votes

4

answers

2

kviews

How to calculate Maximum or Minimum of two numbers without using if?

soft-question functions

apr 20 at 19:15 John Dawkins 71

0

votes

0

answers

27

views

Likely related elements

statistics algorithms soft-question

mar 23 at 4:31 Arjang 2,438

4

votes

2

answers

68

views

$\lim_{x\to\infty}\sqrt [n] {p_n(x)}-\sqrt [m] {p_m(x})$ where $p_k(x)$ is polynomial of order k.

real-analysis limit polynomials

mar 10 at 12:25 Davide Giraudo 56k

1

2

votes

0

answers

189

views

Algorithm for generating homeomorphically irreducible trees of size n

algorithms trees

mar 5 at 11:56 Arjang 2,438

0

votes

5

answers

80

views

Super or subscript notation on the left hand side of a symbol?

soft-question notation

feb 26 at 13:32 mt_ 3,978

2

votes

6

answers

126

views

If $P(x)$ is a polynomial then $\lim_{x \to \infty }P(x) = 0 \iff P(x)=0$, [duplicate]

limit

feb 23 at 23:16 i.a.m 1,475

2

votes

1

answer

41

views

What is the notation for set of prime factors of a number?

elementary-number-theory notation

feb 20 at 9:02 Hurkyl 21.5k

0

votes

0

answers

18

views

Notation used for H in Hyperbolid geomtry metric

notation math-history

feb 5 at 22:15 Arjang 2,438

2

5

votes

4

answers

128

views

Example of a question that would seem not to have enough information for an answer

logic recreational-mathematics

jan 17 at 2:10 Chris 1

0

votes

1

answer

79

views

Is $\lim_{n \to \infty} x^n $ continuous on [0,1]?

limit continuity

jan 6 at 8:07 user17762 75.9k

2

votes

2

answers

49

views

$\frac{\mathrm{d} g(x)}{\mathrm{d}x}=h(x)$ and $\frac{\mathrm{d} h(x)}{\mathrm{d}x}=g(x)$ where $h(x)\neq g(x)$

differential-equations special-functions

jan 1 at 10:54 lab bhattacharjee 28.1k

4

votes

3

answers

728

views

Can a circle's circumference be divided into arbitrary number of equal parts using straight edge and compass only?

geometry geometric-construction

dec 14 at 9:30 rich chris 1

1

vote

2

answers

49

views

What are some alternative ways of describing a Tetrahedron rather than using 4 points?

geometry soft-question big-list

oct 14 at 9:03 bubba 4,469

3

votes

2

answers

863

views

Modern Mathematics having serious problems with Real Numbers?

real-analysis logic

oct 8 at 5:09 NewAlexandria 117

4

votes

4

answers

661

views

How to cut a cube into an icosahedron?

polyhedra solid-geometry

aug 30 at 22:13 Timothy Sharpe 11

6

votes

2

answers

191

views

For what values for m does $\sum \limits_{k=1}^{\infty}\frac{1}{(\ln{k})^m}$ converges?

sequences-and-series

aug 1 at 10:23 vanna 1,020

1

3

votes

3

answers

336

views

Show that $ a，b, \sqrt{a}+ \sqrt{b} \in\mathbb Q \implies \sqrt{a},\sqrt{b} \in\mathbb Q $

abstract-algebra

jul 17 at 14:38 Community♦ 1

2

3

votes

1

answer

107

views

Does $1+\frac{1}{1^k+2^k}+\frac{1}{1^k+2^k+3^k}+\frac{1}{1^k+2^k+3^k+4^k}+\frac{1}{1^k+2^k+3^k+4^k+5^k}\cdots$ telescope?

sequences-and-series

feb 21 '12 at 9:01 Gottfried Helms 7,150

3

votes

3

answers

213

views

$\wedge,\cap$ and $\vee,\cup$ between Logic and Set Theory always interchangeable?

soft-question logic elementary-set-theory intuition

feb 19 '12 at 5:49 Arturo Magidin 158k

3

votes

2

answers

157

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$\wedge,\cap,\times$ and $\vee,\cup,+$ are always interchangeable?

soft-question logic elementary-set-theory arithmetic intuition

feb 19 '12 at 5:12 Arturo Magidin 158k

2

7

votes

2

answers

590

views

value of $1+\frac{1}{1+2}+\frac{1}{1+2+3}+\frac{1}{1+2+3+4}+\frac{1}{1+2+3+4+5}+\cdots$?

sequences-and-series

feb 10 '12 at 22:16 Arjang 2,438

1

vote

0

answers

69

views

Relationship between Number of circles required to surround a circles and the distance function?

analysis analytic-geometry

feb 6 '12 at 10:40 Arjang 2,438

8

votes

2

answers

269

views

How do we prove that $\lfloor0.999\cdots\rfloor = \lfloor 1 \rfloor$?

real-analysis examples-counterexamples

feb 1 '12 at 8:12 user22705 1,056

0

votes

1

answer

118

views

How to show some systems of equations do not have a closed form solution?

abstract-algebra computational-algebra

dec 30 '11 at 14:52 Thomas Andrews 29.4k

1

3

votes

3

answers

190

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Why $2\sqrt{x} + \sqrt{3}$ can’t be simplified any further?

soft-question

dec 17 '11 at 14:24 lhf 35.2k

5

votes

4

answers

258

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Are there infinitely many composites of the form $n =2 p_{k_1}p_{k_2} \cdots p_{k_n} + 1$?

elementary-number-theory

nov 23 '11 at 23:24 André Nicolas 160k

Arjang

55 Questions