Necromancer - Badge - Mathematics Stack Exchange

Necromancer

Answer a question more than 60 days later with score of 5 or more. This badge can be awarded multiple times.

Awarded 14520 times.

Solve $\sqrt{a+bx}+\sqrt{b+cx}+\sqrt{c+ax}=\sqrt{b-ax}+\sqrt{c-bx}+\sqrt{a-cx}$

Awarded yesterday

Hanno

6,9411 gold badge24 silver badges53 bronze badges

Original works of great mathematician Évariste Galois

Awarded yesterday

Philip Dabous

511 silver badge1 bronze badge

How many groups of order $2^2\cdot 3^2\cdot 5^2\cdot 7^2\cdot 11^2\cdot 13^2$ exist?

Awarded 2 days ago

Max Horn

2,67621 silver badges36 bronze badges

Should the sign be reversed if I square both sides of an inequality?

Awarded Nov 27 at 14:13

bitpancakes

631 silver badge7 bronze badges

Elliptic Constructibility of the Heptagon

Awarded Nov 27 at 11:50

Oscar Lanzi

51.2k2 gold badges56 silver badges137 bronze badges

Looking For a Neat Proof of the Fact that the Grassmannian Manifold is Hausdorff

Awarded Nov 26 at 19:10

Rinaldo Cantabile

1,81518 silver badges42 bronze badges

What is the difference between residue and remainder?

Awarded Nov 26 at 16:45

Clyde Kertzer

3,3745 gold badges17 silver badges51 bronze badges

Continuity of Laplace transform

Awarded Nov 26 at 9:19

Mittens

46.8k6 gold badges63 silver badges116 bronze badges

Is there a theorem of intersecting chords in an ellipse?

Awarded Nov 26 at 8:04

Chrystomath

11.1k1 gold badge22 silver badges36 bronze badges

How many ways are there to prove Cayley-Hamilton Theorem?

Awarded Nov 26 at 7:03

Qiaochu Yuan

477k55 gold badges1.1k silver badges1.5k bronze badges

How to construct a genus 2 surface from 8-gon?

Awarded Nov 26 at 5:49

Guiheneuf

611 silver badge1 bronze badge

How do i prove that the reduced row echelon form is unique?

Awarded Nov 25 at 19:37

Julien Puydt

1511 silver badge3 bronze badges

Seeking challenging integrals for high school students

Awarded Nov 25 at 18:53

Integreek

9,0313 gold badges23 silver badges60 bronze badges

Consequences of a proof of Schanuel's conjecture?

Awarded Nov 25 at 1:45

Arvid Samuelsson

1,1746 silver badges19 bronze badges

Finding a closed form for the series $\sum_{n=0}^{\infty}\frac{\binom{2n}{n}^3}{64^n(n+1)^k}$ for $k=1,2,3,4$

Awarded Nov 24 at 9:45

Jack D'Aurizio

373k42 gold badges421 silver badges887 bronze badges

Are there infinitely many $\alpha \times \beta$ Chomp boards where player 2 wins?

Awarded Nov 24 at 4:11

Thomas Blok

5094 silver badges12 bronze badges

Number of distinct $f(x_1,x_2,x_3,\ldots,x_n)$ under permutation of the input

Awarded Nov 23 at 13:18

Generic Human

7,19919 silver badges21 bronze badges

Integrating $\int_a^b\left[ \left(1 - \frac{a}{x} \right)\left(\frac{b}{x}-1 \right) \right]^\frac{1}{2}dx$

Awarded Nov 23 at 5:42

qifeng618

2,3067 silver badges23 bronze badges

Looking for an example of a GCD domain which is not a UFD

Awarded Nov 22 at 11:23

Pedro♦

126k19 gold badges242 silver badges407 bronze badges

A sine integral $\int_0^{\infty} \left(\frac{\sin x }{x }\right)^n\,\mathrm{d}x$

Awarded Nov 22 at 2:50

Ahmed Hejazi

6535 silver badges11 bronze badges

Tiling of a $9\times 7$ rectangle

Awarded Nov 22 at 2:28

Will.Octagon.Gibson

1,6978 silver badges25 bronze badges

On a log-gamma definite integral

Awarded Nov 22 at 2:28

Paul Enta

15.4k2 gold badges41 silver badges70 bronze badges

Truly intuitive geometric interpretation for the transpose of a square matrix

Awarded Nov 22 at 0:53

Bart Vanderbeke

3994 silver badges9 bronze badges

Cardinality of ultraproduct

Awarded Nov 21 at 20:23

Darío G

5,09014 silver badges20 bronze badges

Is $\mathbb{Z}[{ \sqrt 8 } ] $ a Euclidean domain?

Awarded Nov 21 at 14:54

KCd

57.1k6 gold badges102 silver badges166 bronze badges

Prove by induction that $\bigg \vert\prod_{k=1}^{n} a_k - \prod_{k=1}^{n} b_k \bigg \vert \leq \sum_{k=1}^{n} | a_k - b_k|$.

Awarded Nov 21 at 11:11

David C. Ullrich

93.4k6 gold badges84 silver badges155 bronze badges

Limit of $f(x)$ and $f(1/x)$?

Awarded Nov 21 at 8:37

5xum

127k6 gold badges137 silver badges213 bronze badges

Evaluating the integral $\int_0^\infty \frac{\sin x} x \,\mathrm dx = \frac \pi 2$?

Awarded Nov 21 at 1:34

omegadot

12.4k2 gold badges30 silver badges65 bronze badges

Combinatorics - distribution of objects into boxes

Awarded Nov 20 at 15:47

true blue anil

49.7k4 gold badges32 silver badges67 bronze badges

What is the connection between Weil's character bound and Riemann Hypothesis over finite fields

Awarded Nov 20 at 14:34

David E Speyer

65k7 gold badges197 silver badges300 bronze badges

Maximum value of $\sin A+\sin B+\sin C$?

Awarded Nov 20 at 8:53

Christian Blatter

233k14 gold badges206 silver badges491 bronze badges

Expected length of arc in a randomly divided circle

Awarded Nov 19 at 22:12

wei1210516514

511 silver badge1 bronze badge

Why do we restrict the definition of Lebesgue Integrability?

Awarded Nov 19 at 20:02

Anil Pedgaonkar

3132 silver badges7 bronze badges

Is there a geometric explanation for why principal curvature directions are orthogonal?

Awarded Nov 19 at 10:06

Yuanzhao

3592 silver badges13 bronze badges

Is it possible? Each vertex is cut vertex?

Awarded Nov 19 at 1:37

Bruno Andrades

5,4521 gold badge17 silver badges35 bronze badges

$S_4$ does not have a normal subgroup of order $8$

Awarded Nov 18 at 20:23

dylan7

1,3361 gold badge9 silver badges19 bronze badges

what is the difference between functor and function?

Awarded Nov 18 at 1:20

Fibo Kowalsky

2212 silver badges9 bronze badges

Integrals that have yet to be solved - are there any?

Awarded Nov 17 at 22:35

Antonio

1261 silver badge5 bronze badges

Otton Marcin Nikodym/Nikodým?

Awarded Nov 17 at 15:37

pisoir

1,7611 gold badge21 silver badges32 bronze badges

Local $\partial \bar{\partial}$-lemma..

Awarded Nov 17 at 6:27

Gabriel Beiner

1061 silver badge2 bronze badges

Proofs of AM-GM inequality

Awarded Nov 17 at 0:46

bof

83k7 gold badges108 silver badges184 bronze badges

Computing the best constant in classical Hardy's inequality

Awarded Nov 16 at 19:35

Mittens

46.8k6 gold badges63 silver badges116 bronze badges

What transcendental numbers are produced by $\sin{\alpha}$ when $\alpha$ is algebraic/constructible/rational (in radians)?

Awarded Nov 15 at 23:52

Simply Beautiful Art

77k13 gold badges135 silver badges307 bronze badges

Geometric proof/evidence for the 3x3 matrix determinant's formula?

Awarded Nov 14 at 20:53

mndtr

931 silver badge6 bronze badges

Prove that the $n$th roots of unity form a group under multiplication

Awarded Nov 14 at 3:37

mhmurad

5698 silver badges6 bronze badges

Motivating the compact-open topology

Awarded Nov 14 at 2:49

Shameek Paul

1281 silver badge6 bronze badges

Closure of interior of closed convex set

Awarded Nov 13 at 23:33

user04651

1861 silver badge5 bronze badges

$x^4 - y^4 = 2z^2$ has no solution

Awarded Nov 13 at 20:53

Barry Powell

531 silver badge3 bronze badges

Is this graph based on rationals familiar?

Awarded Nov 13 at 15:21

Michael Hardy

Existence of a Linear Recurrence Modulo $p$ with Period $p^2 - 1$

Awarded Nov 12 at 17:23

David E Speyer

65k7 gold badges197 silver badges300 bronze badges

Fibonacci / Lucas Numbers Relationship: $F_{2n} = F_n L_n$

Awarded Nov 12 at 9:01

Ke-Fong Lin

511 silver badge2 bronze badges

What is a simple example of a limit in the real world?

Awarded Nov 12 at 9:01

Surb

57.5k11 gold badges70 silver badges121 bronze badges

Bochner-style theorem for SO(3)

Awarded Nov 11 at 19:33

Fernando

3242 silver badges8 bronze badges

Proof only by transformation that : $ \int_0^\infty \cos(x^2) dx = \int_0^\infty \sin(x^2) dx $

Awarded Nov 11 at 5:01

Quanto

124k9 gold badges199 silver badges301 bronze badges

Any named directions for a 4th spacial dimension?

Awarded Nov 10 at 13:08

Meeper

611 silver badge2 bronze badges

Is there a closed-form expression for the sum of the first k terms in a binomial series?

Awarded Nov 9 at 19:53

LSA

4223 silver badges12 bronze badges

If $f$ analytic and $\neq0$ in a simply connected domain, show a single valued analytic branch of $\log f$ is defined on that domain

Awarded Nov 9 at 16:00

zhw.

108k8 gold badges62 silver badges120 bronze badges

$U(n)$ is a subgroup of $SO(2n)$

Awarded Nov 9 at 4:26

BVquantization

3133 silver badges14 bronze badges

Does division by 0 really have anything to do with $\lim_{x \to 0} \frac{1}{x}$?

Awarded Nov 9 at 3:43

jjagmath

24.7k3 gold badges29 silver badges59 bronze badges

Average length of the longest segment

Awarded Nov 8 at 18:57

geoturer

611 silver badge3 bronze badges

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