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$B: \mathbb R\times \mathbb R \to \mathbb R$ be the function $B(a,b) = ab $. Which of the following is true?

linear-algebra linear-transformations bilinear-form

asked 1 min ago cmi 1,121

0

votes

1

answer

10

views

How to solve this set of simultaneous equations with different unknowns

algebra-precalculus

modified 1 min ago giannispapav 1,711

0

votes

0

answers

3

views

Show that (J,∆) is a nonabelian group.

linear-algebra

asked 2 mins ago amy421 8

0

votes

2

answers

15

views

What is the maximum value of $n$ if $4^n$ divides $1000!$ without a remainder?

number-theory elementary-number-theory factorial

modified 4 mins ago rtybase 11.1k

0

votes

0

answers

7

views

Find probability of markov chain ended in state $0$.

probability stochastic-processes markov-chains

modified 4 mins ago idriskameni 753

1

vote

1

answer

8

views

Is any $k$-th largest element of $\{\mathbf{w}_1^T\mathbf{x},\cdots,\mathbf{w}_n^T\mathbf{x}\}$ piecewise linear?

convex-optimization linear-programming maxima-minima

answered 4 mins ago LinAlg 9,934

0

votes

2

answers

13

views

Help Solving this Probability Expectation Problem

probability expected-value

modified 5 mins ago David K 54.8k

0

votes

0

answers

3

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Exercise about product and coproduct in a family

abstract-algebra

asked 6 mins ago mejopa 1

1

vote

1

answer

27

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How do we evaluate this infinite series

sequences-and-series

answered 14 mins ago GEdgar 62.7k

0

votes

0

answers

11

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On decreasing the variance of estimators given additional information.

probability statistics

modified 15 mins ago Monolite 1,545

0

votes

1

answer

18

views

Is there a way to represent a combinatorial solution space in 2D?

combinatorics combinations

answered 15 mins ago Roddy MacPhee 133

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votes

0

answers

10

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Method of Characteristics - Second order derivatives - Need help finding

pde characteristics

modified 18 mins ago C. Wolfe 36

0

votes

1

answer

8

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Convex hull of the union of compact and convex sets

functional-analysis convex-analysis convex-hulls

answered 18 mins ago TheSilverDoe 2,635

0

votes

0

answers

11

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Make the dominated convergence theorem rigourous

real-analysis integration sequences-and-series

asked 19 mins ago dzhqjk 20

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votes

0

answers

2

views

Contruction of a New Manifold via One-Parameter Families of Embeddings

manifolds cobordism

asked 19 mins ago J1U 612

6

votes

3

answers

56

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Number of possible products

elementary-set-theory

answered 20 mins ago Markus Scheuer 62.2k

-2

votes

1

answer

15

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Calculus- Volume of a Solid Revolution about the Y-axis

integration volume solid-of-revolution

answered 22 mins ago user615345 13

0

votes

0

answers

10

views

how to calculate true negative and false negative from true positive and false positive?

statistics

modified 24 mins ago mark 1

0

votes

1

answer

731

views

How to describe a sample space?

probability probability-theory

modified 24 mins ago Community♦ 1

0

votes

1

answer

31

views

Fermat's Little Theorem & Euler's Theorem

discrete-mathematics totient-function fermat-numbers

answered 27 mins ago Peter 48.1k

0

votes

0

answers

8

views

Wilson's theorems for generalisations of the factorial function.

number-theory

asked 27 mins ago J.Bry 21

0

votes

1

answer

15

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Determine $p$, justifying every step and find all its roots.

linear-algebra

answered 28 mins ago giannispapav 1,699

2

votes

0

answers

6

views

Prove: Weight of a minimum spanning tree is always less or equal than cycle.

graph-theory

asked 32 mins ago geaiib 11

0

votes

1

answer

14

views

Calculating the minimum of pointwise maximum of bivariate functions

real-analysis optimization maxima-minima

modified 33 mins ago Slade 43

0

votes

0

answers

10

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Probability that the 9th one is defective

probability

asked 34 mins ago Abcd 3,053

0

votes

0

answers

6

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Thomas method for Crank–Nicolson scheme with a central finite analog. How to get the boundary values of the coefficients?

numerical-methods mathematical-physics matrix-equations

modified 34 mins ago Павел Якимов 44

0

votes

0

answers

10

views

partial derivative of multi-variable function

multivariable-calculus partial-derivative coordinate-systems spherical-coordinates

modified 35 mins ago Codelearner777 33

0

votes

2

answers

15

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How can we prove that $f(r)= \sum_{n\geq1}\frac{(re^{i\theta})^n}{n}$ from $(-1,1) \to \mathbb C$ is differentiable in $(-1,1)$?

complex-analysis

answered 36 mins ago Bernard 122k

-1

votes

0

answers

11

views

How to solve these questions about probability?

probability continuity

asked 37 mins ago Despacito 1

0

votes

0

answers

14

views

Searching for exam questions ( electrical engineering ) (math)

sequences-and-series ordinary-differential-equations

asked 39 mins ago Mather 341

0

votes

0

answers

15

views

Find the number of ways to express 1050 as sum of next integers

combinatorics elementary-number-theory discrete-mathematics

asked 42 mins ago VirtualUser 941

1

vote

0

answers

15

views

Choosing two constants

real-analysis analysis inequality

asked 42 mins ago aymen 6

2

votes

0

answers

36

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How to use Hahn - Banach theorem to deduce separability? (alternative proof of Krein-Smulian)

real-analysis general-topology functional-analysis

modified 44 mins ago zorro47 553

0

votes

0

answers

8

views

Special polynomials and an identity of hypergeometric series

sequences-and-series polynomials special-functions hypergeometric-function

asked 45 mins ago Hobbyist 644

0

votes

0

answers

8

views

How to prove the Gaussian product theorem?

probability probability-distributions normal-distribution

modified 46 mins ago Good boy 562

1

vote

3

answers

497

views

If $S$ is the circumcenter of $\triangle ABC$ and $D, E, F$ are the feet of altitiudes to opposite sides from $A, B, C$, prove that $SB \perp DF$.

geometry euclidean-geometry triangle

modified 47 mins ago Deveshi Singh 1

2

votes

1

answer

7

views

How to calculate $\int_{S}^{T} \Phi \Big(\frac{l_0-f(t)}{\sigma}\Big)g(t)dt$?

normal-distribution integration calculus

49 mins ago gultu 21

0

votes

0

answers

7

views

Adding variances of a variable

statistics variance

modified 49 mins ago calcstudent 349

1

vote

0

answers

9

views

ℝ is embedded into $ℝ^d$ via any $ι:ℝ→ℝ^d$ with $ι(x)_1=x$ and ι is related to the projection $ℝ^d$ onto the first coordinate. Does this generalize?

real-analysis general-topology functional-analysis measure-theory

asked 51 mins ago 0xbadf00d 1,928

0

votes

1

answer

10

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All idempotents splits in set theory context

category-theory set-theory idempotents

modified 52 mins ago Rodrigo de Azevedo 13.1k

7

votes

1

answer

1k

views

Why does Mochizuki insist on “forgetting the previous history of an object”?

teichmueller-theory abc-conjecture

modified 53 mins ago David Roberts 1,247

0

votes

1

answer

19

views

Pseudoinverse of a matrix?

matrices pseudoinverse

modified 53 mins ago Rócherz 2,806

2

votes

0

answers

20

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arcsin of multiples

trigonometry

modified 55 mins ago RTn 11

0

votes

0

answers

7

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Need help with exact solution and proof of well-posedness for linear first order IVP

calculus ordinary-differential-equations numerical-methods

modified 56 mins ago Yanior Weg 2,394

0

votes

0

answers

4

views

Image of a region bounded by lines $x-y <2$ and $x+y>2$, under mapping $w=1/z$

complex-analysis conformal-geometry

modified 56 mins ago Bernard 122k

1

vote

1

answer

28

views

converting vector inside integral into polar coordinate

coordinate-systems polar-coordinates

modified 57 mins ago Codelearner777 33

2

votes

1

answer

40

views

How Brouwer think about mathematics as a non linguistic phenomenon?

logic philosophy intuitionistic-logic

modified 59 mins ago Mauro ALLEGRANZA 66.8k

0

votes

0

answers

18

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Moments of a Wiener process evaluated at some random time.

probability probability-theory stochastic-processes stochastic-calculus brownian-motion

modified 1 hour ago Community♦ 1

0

votes

0

answers

5

views

Similarity between observations and an ideal trend

statistics data-analysis

asked 1 hour ago mir88 1

0

votes

0

answers

9

views

Weak k-Tuple conjecture form and what we should proof

number-theory prime-numbers

modified 1 hour ago LAGRIDA 67

1

vote

1

answer

28

views

Proof of sum of eigenvalues

linear-algebra matrices

modified 1 hour ago DonAntonio 179k

1

vote

1

answer

23

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Let $N$ be neighborhood of diagonal of $X$ $\Delta_X$. Is it true $int(N)\neq \emptyset$?

general-topology uniform-spaces

modified 1 hour ago Henno Brandsma 111k

0

votes

0

answers

7

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Calculating velocities of 2 squares after collision

physics

asked 1 hour ago Sarah 10

2

votes

1

answer

21

views

Completeness condition for Fréchet space

general-topology functional-analysis topological-vector-spaces

modified 1 hour ago Martin Argerami 127k

0

votes

0

answers

30

views

Second order linear differential equation with distributions: $T''+zT=0$

ordinary-differential-equations distribution-theory

modified 1 hour ago user 4,956

1

vote

1

answer

14

views

Matrix norm of difference

operator-theory norm

modified 1 hour ago Martin Argerami 127k

0

votes

1

answer

29

views

Field Theory Phase Factor vs Anomaly

mathematical-physics low-dimensional-topology quantum-field-theory tqft

modified 1 hour ago Andrews 958

1

vote

1

answer

13

views

Submodule generated by a set

abstract-algebra modules definition

modified 1 hour ago Bernard 122k

1

vote

1

answer

13

views

Calculating the area of cylinder whose radius varies linearly as a function of height using integrals

calculus integration

answered 1 hour ago B. Goddard 19.4k

0

votes

1

answer

20

views

Lemma BC- proof

probability convergence independence borel-cantelli-lemmas

modified 1 hour ago Kavi Rama Murthy 64k

3

votes

0

answers

157

views

A rigorous yet intuitive summary of inflection and critical points for beginning calculus?

real-analysis calculus general-topology limits derivatives

modified 1 hour ago Mitjackson 65

2

votes

0

answers

10

views

Looking for properties of, or formulae for eigenvalues of a symmetric matrix reminiscent of Toeplitz matrices

linear-algebra matrices eigenvalues-eigenvectors symmetric-matrices

modified 1 hour ago Daniel 118

5

votes

2

answers

45

views

Does the action of a linear map on $k$-dimensional subspaces determine it up to scaling?

linear-algebra linear-transformations symmetry grassmannian invariant-subspace

modified 1 hour ago Asaf Shachar 5,698

0

votes

0

answers

5

views

How to decompose a matrix into the form of Khatri-Rao product?

linear-algebra

asked 1 hour ago Palace W 1

0

votes

0

answers

5

views

Descending negative prefix pairs for the unofficial metric prefixes bronto- and geop-?

unit-of-measure

modified 1 hour ago Lordology 101

0

votes

1

answer

15

views

How to find the closed form of a multiple integral

definite-integrals

answered 1 hour ago Sangchul Lee 95.3k

0

votes

0

answers

8

views

Solution strategy for a structurally simple but unusual set of PDEs?

pde

asked 1 hour ago mensch72 1

2

votes

0

answers

13

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(Solved) Orientability of manifold with point removed (Hatcher exc. 3.3.2)

proof-verification algebraic-topology manifolds homology-cohomology

modified 1 hour ago o.h. 471

1

vote

2

answers

55

views

Evaluate $\lim\limits_{n \to \infty} \int_{1-\epsilon}^1 \ln(1+x+…+x^{n-1})dx$

real-analysis calculus integration limits definite-integrals

modified 2 hours ago rtybase 11.1k

0

votes

0

answers

11

views

Mathematical concept of time series modeling

random-variables random-walk time-series

modified 2 hours ago Haris Gusic 2,278

0

votes

0

answers

6

views

Inductive proof of $D_N=-H_n\cdot R_N \cdot H_n $ with the help of block matrices

proof-writing induction hadamard-matrices

modified 2 hours ago QuantaMag 8

0

votes

0

answers

9

views

Show that given any positive set of boundary values, there exist always a unique solution for the unknowns $φ_{i,j}$.

linear-algebra

modified 2 hours ago Bernard 122k

2

votes

0

answers

32

views

Minimum of $\langle Ax,x \rangle - 2 \langle b,x \rangle$.

convex-analysis positive-semidefinite quadratic-programming

modified 2 hours ago Rodrigo de Azevedo 13.1k

0

votes

0

answers

16

views

Ergodicity of a perturbed (continuous-state discrete-time) dynamical system

probability-theory stochastic-processes dynamical-systems ergodic-theory stability-theory

modified 2 hours ago Mr. X 76

2

votes

0

answers

15

views

A continuum-sized convenient category of topological spaces

general-topology functional-analysis category-theory computability descriptive-set-theory

asked 2 hours ago Robin Saunders 506

0

votes

0

answers

23

views

Including rotational motion into a reaction-diffusion model

vector-analysis physics brownian-motion rotations fluid-dynamics

modified 2 hours ago Brendan Darrer 38

0

votes

0

answers

12

views

Birth-death process, queueing theory

probability probability-theory markov-chains queueing-theory birth-death-process

modified 2 hours ago Natalie_94 31

0

votes

0

answers

6

views

to which intrinsic object corresponds connection's hypersurface

algebraic-geometry complex-geometry connections divisors-algebraic-geometry d-modules

asked 2 hours ago epsilones 154

5

votes

2

answers

46

views

Calculate the sum of fractionals

elementary-number-theory integers coprime

modified 2 hours ago Haran 1,118

0

votes

0

answers

10

views

simple numerical approximation to pde solution blows up

derivatives pde numerical-methods algorithms

asked 2 hours ago Oria Gruber 6,532

0

votes

0

answers

4

views

Heuristic understanding of the eigenvalue equality between two Neumann quantum graph

proof-verification graph-theory eigenvalues-eigenvectors eigenfunctions

modified 3 hours ago Mathematicing 2,455

1

vote

0

answers

12

views

Proper actions in complex geometry

reference-request complex-geometry covering-spaces quotient-spaces holomorphic-bundles

asked 3 hours ago user650157 6

5

votes

1

answer

65

views

Galois Theory for Finite Local Commutative Rings

galois-theory finite-rings local-rings

answered 3 hours ago M10687 2,656

3

votes

1

answer

25

views

Rolle theorem proof by dichotomy

real-analysis derivatives rolles-theorem

modified 3 hours ago Avi 11

1

vote

2

answers

74

views

+50

The matrix corresponds to a homomorphism $\mathbb{Z^2} → \mathbb{Z^3}$

abstract-algebra matrices modules

modified 3 hours ago user26857 39.3k

0

votes

1

answer

20

views

Connection between the Binomial distribution, Poisson distribution and Normal distribution

probability probability-theory statistics probability-distributions soft-question

modified 3 hours ago Martin Hansen 78

4

votes

1

answer

40

views

If every rearrangement of the series converges uniformly then the series converges absolutely uniformly

real-analysis sequences-and-series absolute-convergence

modified 3 hours ago Sangchul Lee 95.3k

0

votes

1

answer

27

views

Generating function closed form

generating-functions closed-form

modified 3 hours ago Crostul 28k

7

votes

0

answers

116

views

+100

Elimination of indeterminacies

abstract-algebra algebraic-geometry blowup

modified 3 hours ago user646223 36

2

votes

0

answers

12

views

Valid metric on a hyperbolic space

metric-spaces hyperbolic-geometry

modified 3 hours ago tdc 304

2

votes

0

answers

13

views

Holomorphic morphisms cannot be extended to codimension $2$

algebraic-geometry complex-geometry several-complex-variables

modified 3 hours ago Akatsuki 1,114

5

votes

1

answer

30

views

The digit at position $n$ of the number $x$ in base $m$

functions number-systems

modified 3 hours ago Infiaria 393

4

votes

0

answers

34

views

Example of an associative function $\mathbb{R}^2 \to \mathbb{R}$ which is continuous in both variables but fails to be continuous

real-analysis abstract-algebra general-topology

asked 4 hours ago Morgan Rogers 560

3

votes

1

answer

30

views

Coordinate Transformation and Differential Operators

calculus tensors fluid-dynamics

modified 4 hours ago RRL 52.1k

2

votes

3

answers

33

views

Bezier curve, constrained shortest path and minimum time: is the optimal curve always of minimal degree?

geometry convex-optimization bezier-curve

modified 4 hours ago Steve T. 38

2

votes

1

answer

12

views

Condition for three mutually perpendicular planes in 3D Geometry.

geometry 3d plane-geometry

answered 4 hours ago Song 16.3k

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