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Ring homomorphism may not preserve $1$.

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Kishalay Sarkar

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Prove that $q(x,y)=Ax^2+2Bxy+Cy^2$ is positive definite

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Ivan Bravo

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Find the value of $\frac{\alpha^{2014}+\beta^{2014}+\alpha^{2016}+\beta^{2016}}{\alpha^{2015}+\beta^{2015}}$ for the roots of $x^2-3x+1$ [duplicate]

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Marble

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Show that the function $f:\mathbb{R} \rightarrow \mathbb{R}$ defined by $f(x) = x^2$ is not a homomorphism.

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XRBtoTheMOON

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Integral Curves of Vector Fields with Zero Divergence or Zero Curl

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joshuaronis

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Find area of shaded area in curve with range of values for $y$

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dagda1

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What is the condition that determines a proper integral?

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Student

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Probability of drawing three balls of white colour

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Equation_Charmer

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Can we have a power density but not a natural density?

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Daniel Fischer

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Rational homotopy groups of spheres

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iwriteonbananas

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Is there any easy example of a formal proof in mathematics and an equivalent informal proof to illustrate a difference between those two?

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TKN

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A simple question on characteristic subgroups

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the_fox

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Proving the trace equals the dimension of an image

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Alex Thornhill

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Laplacian in 4-dimensions

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Purushothaman

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Simple examples of non-representable functors

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Neuromath

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Point out my Fallacy, in combinatorics problem, please.

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mnulb

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Definition of minimal free resolution

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T C

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Show that Lebesgue outer measure is the infimum of Lebesgue measure

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Henricus V.

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show that $\mathbb{Z}$ is totally disconnected

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ann

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Bijection between Dyck paths with $k$ peaks and $n+1-k$ peaks

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Mike Earnest

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Help with calculating a Riemann-Stieltjes integral.

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Tony

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Check if two vertices of a graph are connected with an MILP constraint

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user3149593

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The Levi-Civita Connection on the Hyperbolic Plane

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Anthony

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Stationary solution of heat equation [closed]

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Kimmen

155 bronze badges

A question on convergence of Fourier series and the derivative of the function

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Rajesh D

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Rotating a rectangle 360 degrees on its diagonal

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Alex Dixie

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What concretely does it mean to "do mathematics in a topos X"?

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user56834

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Why does the CRT formula yield a solution of a congruence system?

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Peter Foreman

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Convexity and entropy for conservation laws

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Rosy

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Does Optional Stopping theorem apply for bounded martingale and almost surely finite stopping time?

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Akira

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Absolute of all eigenvalues are always bounded by maximal singular value

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sleeve chen

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Cutting an equilateral triangle into $n$ equal pieces

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Taha Akbari

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Normal form of differential equation $y'=y-y^2$

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xxxxx

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Distribution of the maximum of absolute value of multivariate Gaussian

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simko

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What is the Support of a permutation

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Frames Catherine White

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Difference between sufficient and non sufficient statistics

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Halci Garrett

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$x_n$ is the $n$'th positive solution to $x=\tan(x)$. Find $\lim_{n\to\infty}\left(x_n-x_{n-1}\right)$

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user72273

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Finite element method books

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MKF

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Cauchy functional equation over the complex field

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user48900

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Probability of Normal Distribution

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Frightlin

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Deep research in probability theory

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user493137

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Finding a closed form expression for $\sum_{k=0}^n(k^2+3k+2)$ using generating functions

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null1

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Why Hankel matrices?

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eepperly16

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Adjacency matrix of strong product of graphs

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python_enthusiast

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$|\sin(nx)| ≤ n|\sin x|$ Proof by induction [duplicate]

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David

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Finding the remainder when a polynomial is divided by a product of numbers whose remainders are known

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Gerard

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Prove that if F and G are nonempty families of sets, then $\bigcup \mathcal F \subseteq \bigcap \mathcal G$

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Stokolos Ilya

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Calc 3 Question: Orthogonal Decomposition of Two Vectors?

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Jess

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Find all primes $p>2$ for which $x^2+x+1$ is irreducible in $\mathbb{F}_p[x]$ [duplicate]

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cap

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minimum of $\frac{1}{2}x^tQx-c^tx$ subject to $Ax=b$ is local $\iff$ is global

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Paprika

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Probability that three segments can form a triangle. (NOT A DUPLICATE)

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Hussain-Alqatari

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Baire property of complete metric spaces

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For how many two-element subsets $\{a, b\}$ of the set $\{1, 2, 3, 4, 5, 6, \dots , 36\}$ is the product $ab$ a perfect square?

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LxSquid Official

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Show that the relation R consisting of all pairs (x, y) such...

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Jonas Schøn

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1.find line of curvature, asymptotic curve and geodesic curve of the unit sphere?

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Godgog Arsenal

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Probability of getting 2 Consecutive heads in N throws.

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netqst

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Formula for bump function

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Richard Burke-Ward

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Finding constant for lower bound of operator norm

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BaroqueFreak

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show that series $\sum_{n=1}^\infty \frac {(-1)^{n-1}}{n+x^2}$ is uniformly convergent for all real values of x

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lol

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Proximal Mapping for maximum of linear and quadratic function

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yon

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