Excavator - Badge - Mathematics Stack Exchange

Excavator

Edit first post that was inactive for 6 months.

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What exactly is the difference between a derivative and a total derivative?

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Christoph Rackwitz

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Proving that all entire and injective functions take the form $f = ax + b$?

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JacKethane

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Why do we care about the Hilbert Cube?

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Robin Saunders

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Noetherian Hausdorff Topological Spaces

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Gary Ng

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Get the equation of a circle when given 3 points

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Random Citizen

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Evaluating the limits for $y=(1+\frac{y}{x})^x$ [closed]

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Nishant Kalonia

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Can we say there is exactly one root of $x^4-7x^3+9=0$ in $(1, \:\: 2)$?

Awarded May 5 at 5:07

Kshitiz Katiyar

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Using tan(x), show that open interval is diffeomorphic with the real line

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Random Math Enthusiast

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Show finite complement topology is, in fact, a topology

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Ethan

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Odd and even numbers in binary system

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Lhachimi

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Is there a function with one local extremum but no global extremum?

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ncant

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How to find the area of a segment of an ellipse

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Davy Walker Collins

33 bronze badges

NFA of $k$ states recognizing all words of length $\le k$

Awarded Apr 30 at 6:47

MangoPizza

1,8267 silver badges27 bronze badges

Inverse matrix’s eigenvalue?

Awarded Apr 29 at 5:21

altwoa

1,3683 silver badges15 bronze badges

Geometric series of complex numbers

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nabla_enjoyer

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Probability Models and distribution techniques

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Hjalmar Rosengren

3522 silver badges7 bronze badges

Prove the Countable additivity of Lebesgue Integral.

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yuanming luo

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The Fubini-Study form on the complex projective space can be obtained from the Symplectic reduction

Awarded Apr 26 at 5:37

Dialektik

1287 bronze badges

Extension of regular function

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Dan Lyness

52 bronze badges

What is a differential form?

Awarded Apr 25 at 4:26

Learner

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How to compute $\int_0^1\frac{\text{Li}_2(x^2)\arcsin^2(x)}{x}dx$ or $\sum_{n=1}^\infty\frac{4^nH_n}{n^4{2n\choose n}}$

Awarded Apr 25 at 4:26

Jorge Layja

3,91424 silver badges34 bronze badges

Canonical Isomorphism Between $\mathbf{V}$ and $(\mathbf{V}^*)^*$

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Manuel Bonanno

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Picard's Little Theorem Proofs

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erpxyr2001

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Writing a Permutation as a product of Disjoint Cycles

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Federico

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$(M,d)$ is a compact metric space and $f:M \to M$ is injective such that $d(f(x),f(y)) \le d(x,y) , \forall x,y \in M$ , then is $f$ an isometry?

Awarded Apr 23 at 4:03

Jonathan Hole

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$\limsup_n (a_n+b_n+c_n)+\limsup_n b_n \le \limsup_n (a_n+b_n)+\limsup_n (b_n+c_n)$?

Awarded Apr 23 at 4:03

chirico

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how to strictly prove $\sin x<x$ for $0<x<\frac{\pi}{2}$

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FIfi

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Phase Portrait of One Dimensional ODE

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axolotl

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"Minimal" definition of Wiener process

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Pantelis Tassopoulos

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IS $f(x)= x^4+3x^2+2$ is irreducible over $\mathbb{Q}[X]$

Awarded Apr 19 at 4:22

MUSICMATENGLISH

436 bronze badges

How are the coefficients of the shifting nth root algorithm determined?

Awarded Apr 18 at 5:08

Yarl

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GCDs in integral domains are unique up to unit factors (associates)

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The Surgeon of Death

5081 silver badge13 bronze badges

All different 2d representations of S3

Awarded Apr 18 at 5:08

PlayerUnknown1098

5304 silver badges12 bronze badges

Show that the hyperboloid of one sheet is a doubly ruled surface.

Awarded Apr 17 at 4:11

user1361047

133 bronze badges

Between two Real Numbers exists Rational Number

Awarded Apr 15 at 4:34

mikecarti

32 bronze badges

Prove that $\cos(\pi/7)$ is root of equation $8x^3-4x^2-4x+1=0$

Awarded Apr 15 at 4:34

shenez Chen

32 bronze badges

Proving discontinuity using epsilon-delta-definition: Have I understood this correctly?

Awarded Apr 15 at 4:34

Adil Raza

3462 silver badges12 bronze badges

How to construct change of basis matrix

Awarded Apr 14 at 11:14

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fractal_sounds

256 bronze badges

Number of ways to pack K items into N bins each with capacity R

Awarded Apr 14 at 6:51

FutureNerd

1032 bronze badges

Dot product of a vector and del operator

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User198

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Injectivity of the Differential of Smooth Map

Awarded Apr 11 at 4:13

SubGui

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For a normal distribution, what is the ratio between the standard deviation and the interquartile range? [closed]

Awarded Apr 11 at 4:13

Jacob Hungerford

376 bronze badges

Show independence of two random variables based on factorization of joint probability function

Awarded Apr 11 at 4:13

Haire

196 bronze badges

Why the limit of $\frac{\sin(x)}{x}$ as $x$ approaches 0 is 1?

Awarded Apr 11 at 4:13

mcmk

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Counterexample for the solvability of $-\Delta u = f$ for $f\in C^{0}$

Awarded Apr 10 at 4:54

Thomas

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How exactly can't $\delta$ depend on $x$ in the definition of uniform continuity?

Awarded Apr 10 at 4:54

Maxman013

827 bronze badges

Resolving polygon self intersection faster than O($n^2$)

Awarded Apr 9 at 4:36

Elliott

15010 bronze badges

Convex function as supremum of countably many affine functions

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A.J. LaMotta

631 silver badge8 bronze badges

Continuous image of $\mathbb{R}$ is Borel.

Awarded Apr 8 at 4:26

Aranka

484 bronze badges

Evaluating $\lim\limits_{n\to\infty} \left(\frac{1^p+2^p+3^p + \cdots + n^p}{n^p} - \frac{n}{p+1}\right)$

Awarded Apr 5 at 5:59

User1305275

1,2962 silver badges20 bronze badges

Markov Process and interpretation of the transition matrices

Awarded Apr 5 at 5:59

Shaheer ziya

4092 silver badges13 bronze badges

Can somebody explain to me Cantor's diagonalization argument?

Awarded Apr 5 at 0:34

Dhara

34 bronze badges

The number of ways to pair 2n players in a tennis tournament

Awarded Apr 4 at 4:07

powerline

9934 silver badges24 bronze badges

What different ways are there to construct the Lebesgue measure?

Awarded Apr 3 at 4:53

Jose Garmilla

32 bronze badges

How to find area of triangle from its medians

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curiousguy

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Analytically compute signed distance of ellipsoid

Awarded Apr 3 at 4:53

Jwosty

1034 bronze badges

If $\frak{g}$ is a real Lie algebra, why is the Killing form of its complexification the same?

Awarded Apr 1 at 4:17

user1589421

135 bronze badges

Proof on Fibonacci sequence: $F(1) + F(3) + \cdots + F(2n-1) = F(2n)$ using induction and recursion

Awarded Apr 1 at 4:17

Emeth

53 bronze badges

Radius vs Radius of curvature of an ellipse

Awarded Apr 1 at 4:17

Ilaggo

32 bronze badges

Is there any easy way to understand the definition of Gaussian Curvature?

Awarded Mar 31 at 17:52

ramslök USv

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