User Airdish

1

11

votes

1

answer

115

views

Reference Request for inequalities without variables

inequality reference-request

Aug 25 '16 at 14:48 Michael Rozenberg 177k

2

10

votes

4

answers

1k

views

Is collapsing considered a legitimate proof?

sequences-and-series proof-writing

Jan 4 '16 at 4:14 Airdish 2,273

1

6

votes

1

answer

135

views

Tricky inequality no avail to AM-GM

algebra-precalculus inequality factoring fractions a.m.-g.m.-inequality

Jan 5 '18 at 7:57 Michael Rozenberg 177k

1

6

votes

1

answer

1k

views

How to solve $f(f(x)) = x$?

algebra-precalculus functional-equations

Sep 22 '16 at 13:29 Ivan Neretin 11.1k

6

votes

0

answers

228

views

Find the largest positive integer $n$ such that $n^3 + 100$ is divisible by $n+10$ [duplicate]

elementary-number-theory proof-verification congruences

Sep 5 '16 at 6:19 Airdish 2,273

3

5

votes

1

answer

795

views

Prove $x^4 + 131 = 3y^4$ has no integer solutions

elementary-number-theory diophantine-equations

Sep 5 '16 at 15:27 Parcly Taxel 81.3k

1

5

votes

0

answers

102

views

Reference request that explains the logic and ideas behind auxiliary constructions in synthetic geometry

geometry reference-request euclidean-geometry intuition

Aug 7 '16 at 13:59 Airdish 2,273

1

5

votes

0

answers

87

views

The irrationality of Pi [duplicate]

irrational-numbers pi

Nov 10 '15 at 17:56 Martin Sleziak 52.3k

4

votes

3

answers

230

views

If $ab \neq ba$, prove that $aba \neq e$

abstract-algebra group-theory

Apr 15 '17 at 4:41 alex.jordan 49.1k

1

4

votes

1

answer

90

views

Repeating decimals

elementary-number-theory contest-math

Feb 5 '17 at 13:03 N.S.JOHN 1,539

4

votes

2

answers

80

views

Generating pythagorean triples in this question

elementary-number-theory diophantine-equations pythagorean-triples

Sep 4 '16 at 17:49 Luca Bressan 6,427

3

votes

4

answers

3k

views

Why can't $\sin(1/x)$ be differentiated?

calculus derivatives trigonometry

Jan 16 '20 at 20:09 Descartes Before the Horse 5,860

1

3

votes

1

answer

78

views

There are no Lebesgue measurable sets $A,B \subset \mathbb{R}$ such that $A \times B \subset S$.

measure-theory lebesgue-measure

May 29 '19 at 4:37 copper.hat 153k

1

3

votes

1

answer

437

views

Examples of transforming into Weierstrass form

reference-request elliptic-curves

Apr 28 '17 at 15:15 Álvaro Lozano-Robledo 14.2k

3

votes

1

answer

46

views

A faster way than tedious multiplying [duplicate]

algebra-precalculus factoring proof-explanation

Sep 6 '16 at 12:07 Community♦ 1

3

votes

3

answers

1k

views

Find all integer solutions to $15x + 12y + 30z = 24$

elementary-number-theory diophantine-equations gcd-and-lcm euclidean-algorithm linear-diophantine-equations

Aug 4 '16 at 14:32 Kelenner 18.3k

2

3

votes

4

answers

183

views

Proving that these terms have no common factors [duplicate]

elementary-number-theory divisibility gcd-and-lcm

Jul 17 '16 at 17:21 Airdish 2,273

1

3

votes

0

answers

79

views

Where does the premise of this idea come from?

inequality proof-explanation

Jun 27 '16 at 7:30 Airdish 2,273

3

votes

2

answers

104

views

How to prove that this is a parellelogram?

geometry euclidean-geometry plane-geometry

Mar 17 '16 at 14:38 Intelligenti pauca 37k

1

2

votes

2

answers

161

views

Can the composition of a rational function ever be a polynomial?

polynomials function-and-relation-composition rational-functions

Apr 23 '20 at 22:27 Eric Wofsey 267k

1

2

votes

1

answer

137

views

Motivation for definition of bilinear form in linear representation of Coxeter groups?

group-theory finite-groups representation-theory reflection coxeter-groups

Jul 27 '19 at 21:06 Jyrki Lahtonen 120k

2

votes

1

answer

84

views

Function is Baire-1 if and only if these sets are $F_\sigma$

real-analysis analysis measure-theory continuity

Apr 25 '19 at 5:43 postmortes 5,436

2

votes

1

answer

186

views

Why is the volume element unique in the way Spivak develops it?

linear-algebra multivariable-calculus tensors volume exterior-algebra

Feb 12 '19 at 0:09 Community♦ 1

2

votes

1

answer

30

views

A hump in understanding the proof for the set of algebraic numbers forming a field

modules algebraic-number-theory

Sep 23 '17 at 16:56 Angina Seng 150k

2

votes

6

answers

195

views

If $a$ and $b$ are consecutive integers, prove that $a^2 + b^2 + a^2b^2$ is a perfect square.

algebra-precalculus elementary-number-theory factoring

May 23 '17 at 18:08 Gunnar Sveinsson 344

1

2

votes

5

answers

82

views

Minimum value of a trigonometric function

trigonometry optimization

Apr 26 '17 at 5:04 Hari Shankar 2,835

2

votes

2

answers

101

views

Smallest subgroup and $\langle a \rangle$.

abstract-algebra group-theory intuition

Apr 10 '17 at 18:10 q.Then 2,824

1

2

votes

1

answer

80

views

Showing that the result of an equation may be a perfect square

elementary-number-theory polynomials perfect-powers

Sep 17 '16 at 14:26 Kieren MacMillan 6,371

2

votes

1

answer

75

views

Solving recurrence relation with each term defined in terms of the 2 preceding terms

sequences-and-series recurrence-relations contest-math

Sep 10 '16 at 18:54 Stefan4024 34.2k

1

2

votes

2

answers

126

views

Find $a^{2013} + b^{2013} + c^{2013}$

algebra-precalculus functions polynomials

Aug 9 '16 at 15:48 Hagen von Eitzen 343k

Stack Exchange Network

current community

your communities

more stack exchange communities

Next privilege

Next badge

97 Questions

Reference Request for inequalities without variables

Is collapsing considered a legitimate proof?

Tricky inequality no avail to AM-GM

How to solve $f(f(x)) = x$?

Find the largest positive integer $n$ such that $n^3 + 100$ is divisible by $n+10$ [duplicate]

Prove $x^4 + 131 = 3y^4$ has no integer solutions

Reference request that explains the logic and ideas behind auxiliary constructions in synthetic geometry

The irrationality of Pi [duplicate]

If $ab \neq ba$, prove that $aba \neq e$

Repeating decimals

Generating pythagorean triples in this question

Why can't $\sin(1/x)$ be differentiated?

There are no Lebesgue measurable sets $A,B \subset \mathbb{R}$ such that $A \times B \subset S$.

Examples of transforming into Weierstrass form

A faster way than tedious multiplying [duplicate]

Find all integer solutions to $15x + 12y + 30z = 24$

Proving that these terms have no common factors [duplicate]

Where does the premise of this idea come from?

How to prove that this is a parellelogram?

Can the composition of a rational function ever be a polynomial?

Motivation for definition of bilinear form in linear representation of Coxeter groups?

Function is Baire-1 if and only if these sets are $F_\sigma$

Why is the volume element unique in the way Spivak develops it?

A hump in understanding the proof for the set of algebraic numbers forming a field

If $a$ and $b$ are consecutive integers, prove that $a^2 + b^2 + a^2b^2$ is a perfect square.

Minimum value of a trigonometric function

Smallest subgroup and $\langle a \rangle$.

Showing that the result of an equation may be a perfect square

Solving recurrence relation with each term defined in terms of the 2 preceding terms

Find $a^{2013} + b^{2013} + c^{2013}$