Mathematics Stack Exchange

0

votes

1

answer

8

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Simplifying a Boolean algebra expression

boolean-algebra

modified 48 secs ago Bram28 60.7k

0

votes

0

answers

2

views

Proof of the decomposition of an isogeny into a separable part and a frobenius.

number-theory elliptic-curves cryptography

asked 3 mins ago AiYagami 51

0

votes

1

answer

17

views

how to use KKT conditions for an exponential function

optimization karush-kuhn-tucker

modified 4 mins ago Kavi Rama Murthy 55.3k

8

votes

3

answers

168

views

+50

Find a point $X$, in the plane of regular pentagon $ABCDE$, that minimizes $\frac{XA+XB}{XC+XD+XE}$.

geometry optimization euclidean-geometry maxima-minima geometric-inequalities

modified 4 mins ago Jean Marie 29.1k

0

votes

0

answers

4

views

$\frac 1 {\overline {f(1/\overline z)}}$ is differentiable for $|z|>1$

complex-analysis derivatives

asked 4 mins ago Pascal's Wager 342

1

vote

1

answer

37

views

solution of an algebraic equation with integers

abstract-algebra diophantine-equations

answered 6 mins ago Gerry Myerson 146k

0

votes

0

answers

4

views

Let $X=\{(x, |x|)\text{such that} -1\leq x\leq 1\}.$, $p:X\rightarrow [-1,1]$ be the map defined by $p(x,y)=x$.

general-topology

asked 7 mins ago StammeringMathematician 2,356

2

votes

0

answers

33

views

+50

Conditional expectation for brownian motion

stochastic-processes stochastic-calculus stochastic-integrals stochastic-analysis

modified 8 mins ago user408858 460

0

votes

0

answers

5

views

Variance equations that yield inconsistent results

statistics probability-distributions variance gambling

asked 10 mins ago MSD 8

0

votes

1

answer

26

views

Showing holomorphy of integral

real-analysis analysis fourier-analysis

answered 12 mins ago DisintegratingByParts 59k

1

vote

1

answer

12

views

Suppose every eigenvalue $\lambda$ of $X$ satisfies $|\lambda|<2\pi$. If $\exp(X)v=v$ for some $v\in \mathbb C^n$ then $Xv=0$.

matrices

answered 15 mins ago copper.hat 126k

1

vote

1

answer

9

views

Show that the boolean formulas [(p ∧ ¬q) ∨ q] ∧ [(¬q ∧ p) ∨ r] and (p ∧ ¬q) ∨ (r ∧ q) are equivalent.

discrete-mathematics equivalence-relations

modified 17 mins ago Bram28 60.7k

2

votes

1

answer

7

views

Is this estimate true for functionals on Frechet spaces?

functional-analysis distribution-theory topological-vector-spaces

answered 17 mins ago Martin Argerami 125k

-1

votes

0

answers

7

views

Floating-point arithmetic M(10,6,6)

arithmetic

modified 20 mins ago pawelK 37

0

votes

0

answers

16

views

Sigma-algebra generated by integer multiples

measure-theory

modified 22 mins ago Andrés E. Caicedo 65.2k

0

votes

0

answers

14

views

Prove Triangle Inequality for Two Special Cases

real-analysis proof-verification

asked 24 mins ago CL40 115

0

votes

1

answer

10

views

Maximum minimum degree possible in a matchless graph.

graph-theory

answered 25 mins ago Misha Lavrov 45.1k

4

votes

1

answer

69

views

Proof that x^3 = 2 has a real solution using completeness theorem?

real-analysis real-numbers

answered 31 mins ago Berci 60.2k

0

votes

1

answer

21

views

Fourier transform of general complex signal

fourier-series fourier-transform

modified 32 mins ago Metric 918

0

votes

1

answer

10

views

Probability of specific card being in the deck vs your players hand?

probability combinatorics discrete-mathematics conditional-probability

answered 32 mins ago kccu 9,633

1

vote

0

answers

21

views

Where did I go wrong in proving $\mathbb E[X^{2n}] = \prod_{1 \leq k \leq 2n, k \operatorname{odd}}k$

probability probability-theory probability-distributions expected-value

modified 34 mins ago SABOY 620

0

votes

0

answers

9

views

Level Lowering obstructions

number-theory algebraic-geometry diophantine-equations elliptic-curves discriminant

asked 35 mins ago Pythagorus 159

0

votes

0

answers

6

views

Which of the conditions imply that a function is uniformly continuous relative to an uniformity?

uniform-continuity uniform-spaces

asked 37 mins ago user479859 75

1

vote

1

answer

19

views

An easy example of an inverse system which is not the constant inverse system

general-topology proof-verification order-theory

modified 40 mins ago Diglett 936

0

votes

0

answers

20

views

Lebesgue integral of ${x^2}$

calculus measure-theory lebesgue-integral lebesgue-measure

asked 41 mins ago NotAName 24

0

votes

0

answers

11

views

find $p$, $q$ such that $f$ is differentiable at zero

real-analysis

asked 42 mins ago VirtualUser 684

7

votes

1

answer

72

views

Is the function $f(n)=\varphi(n)+\varphi(n+1)-n$ surjective?

number-theory elementary-number-theory totient-function

modified 43 mins ago Will Jagy 102k

2

votes

1

answer

818

views

How to define Surface Laplacian on the sphere with radius 1

multivariable-calculus differential-geometry

modified 48 mins ago Community♦ 1

0

votes

2

answers

21

views

Closed form using Binomial Expansion

combinatorics binomial-theorem

modified 49 mins ago kccu 9,608

0

votes

0

answers

12

views

What is the difference between conditional probability and a stochastic kernel?

probability-theory reference-request stochastic-processes

asked 49 mins ago user400188 429

2

votes

1

answer

96

views

Five Similar Triangles from 4-5-6

geometry triangle recreational-mathematics puzzle

modified 52 mins ago Oscar Lanzi 12.3k

0

votes

1

answer

30

views

Two Mixed Integer Linear Programs (MILP) with different objectives and same constraints

optimization convex-optimization integer-programming mixed-integer-programming

answered 52 mins ago prubin 1,385

0

votes

1

answer

8

views

Question about proof of equivalent conditions for ergodicity

real-analysis probability ergodic-theory

answered 54 mins ago Kavi Rama Murthy 55.3k

0

votes

1

answer

16

views

Quotient of two ideals equality

ring-theory

answered 54 mins ago Stefan4024 30.1k

0

votes

1

answer

16

views

Is the set of all choice sets on a infinite partition on $\mathbb N$ equal in cardinality to $\mathcal P(\mathbb N)$?

elementary-set-theory

modified 55 mins ago Noah Schweber 123k

0

votes

1

answer

13

views

how to improve numerical stability

numerical-methods

modified 57 mins ago Larry 2,267

6

votes

5

answers

423

views

Writing a proof

proof-writing proof-explanation

answered 57 mins ago Reinhard Meier 2,852

3

votes

1

answer

22

views

A coend in the category of vector spaces

linear-algebra abstract-algebra category-theory monoidal-categories

modified 59 mins ago Eric Wofsey 183k

1

vote

1

answer

15

views

Large Deviations rate function and Cramérs Theorem

large-deviation-theory

answered 1 hour ago kimchi lover 9,746

0

votes

0

answers

6

views

Solving an Infinite Complex Integral with a Singularity and Oscillatory Behavior

complex-analysis fourier-analysis fourier-transform

modified 1 hour ago Bunji 8

0

votes

1

answer

41

views

Fundamental theorem of Calculus failure cause

calculus

answered 1 hour ago saulspatz 14.3k

2

votes

1

answer

26

views

Using Rouché's theorem to bound zeroes of partial sums of $e^z$

complex-analysis rouches-theorem

answered 1 hour ago jmerry 4,702

0

votes

1

answer

26

views

Norm of Fourier series

real-analysis functional-analysis operator-theory hilbert-spaces orthonormal

answered 1 hour ago Stefan Lafon 1,190

1

vote

1

answer

32

views

Topology boundary point terminology

general-topology

answered 1 hour ago William Elliot 7,732

2

votes

1

answer

16

views

Determine the critical region for this test at significance level $\alpha = 0.05$.

statistics

answered 1 hour ago Alejandro Nasif Salum 4,434

0

votes

0

answers

15

views

Prove this formula follows from a function being continuously differentiable?

limits multivariable-calculus derivatives

asked 1 hour ago W. MacTurk 13

1

vote

0

answers

10

views

Why are the singular values of a matrix (from SVD) called so?

linear-algebra

asked 1 hour ago siva 26

1

vote

0

answers

17

views

Extending in topology: $M\backslash \overline{A} = \text{int }(M \backslash A)$ and $M \backslash \text{int } (A) = \overline{M \backslash A} $

general-topology

modified 1 hour ago Marine Galantin 786

0

votes

1

answer

27

views

equivalence classes and minimal elemnts

discrete-mathematics

answered 1 hour ago Nick Peterson 26.3k

0

votes

0

answers

9

views

Define a variable and an equation for the situation - Why Division and not multiplocation equation?

algebra-precalculus

asked 1 hour ago Pearl 27

1

vote

0

answers

29

views

Where does the gamma function come from

gamma-function

modified 1 hour ago David G. Stork 10.7k

0

votes

2

answers

31

views

$(X_1,\tau_1)\times(X_2,\tau_2)\cong (X_2,\tau_2)\times(X_1,\tau_1) $

general-topology proof-writing

modified 1 hour ago Chris Custer 11.6k

1

vote

1

answer

17

views

Facts about continuity and maps

general-topology

answered 1 hour ago William Elliot 7,732

0

votes

0

answers

12

views

How to find the translation vector from helicoidal motions in an affine space

linear-algebra linear-transformations affine-geometry

modified 1 hour ago javlacalle 123

2

votes

0

answers

7

views

Stapled sequences- set of consecutive positive integers such that no one of them is relatively prime with all of the others

number-theory elementary-number-theory coprime

modified 1 hour ago Dr. Mathva 1,109

0

votes

0

answers

13

views

What is the Weak Maximum Principle for Scalars and How is it Derived?

differential-geometry ricci-flow

modified 1 hour ago Tom 267

6

votes

1

answer

37

views

An identity on $\small{}_pF_q\left(\left.\begin{array}{c} a_1+1,a_2+1,\dots ,a_p+1\\ b_1+1,b_2+1,\dots ,b_q+1\end{array}\right| z\right)$

derivatives hypergeometric-function

modified 1 hour ago Paul Enta 4,651

3

votes

3

answers

62

views

Birthday problem, want about using unordered counting?

probability combinatorics

modified 1 hour ago G Cab 18.5k

0

votes

1

answer

15

views

Calculating the var(β) in a least square regression model

regression least-squares linear-regression regression-analysis

modified 1 hour ago Alejandro Nasif Salum 4,434

1

vote

1

answer

10

views

Why is this a mutiplication equation VS a division equation?

algebra-precalculus

answered 1 hour ago Frpzzd 22.6k

2

votes

0

answers

36

views

Name this inner product

linear-algebra

asked 1 hour ago D_J_S 56

0

votes

1

answer

12

views

How to solve a differential equation with the characteristic equation plus some conditions

ordinary-differential-equations

modified 1 hour ago Oscar 351

2

votes

0

answers

43

views

Proof verification- $ \sigma $ - Algebra, Algebra, Ring

real-analysis measure-theory proof-verification elementary-set-theory

modified 2 hours ago Andrés E. Caicedo 65.2k

0

votes

0

answers

22

views

Logarithmic Function for Drop Rates in a Game

logarithms

modified 2 hours ago David G. Stork 10.7k

0

votes

0

answers

13

views

Linearization of a max function

linear-programming

asked 2 hours ago Clement 1

0

votes

0

answers

9

views

Derive the expression for $ \operatorname{Var}(b_1)$ for the no-intercept linear model y = $b_1$*$x_i$ + $ε_i$

statistics proof-verification variance linear-regression

modified 2 hours ago user122661 418

1

vote

1

answer

20

views

If $\mathbb{Z}\ni \underbrace{z}_{\ne 0} \in I \trianglelefteq R:=\{a+\sqrt7b:a,b\in\mathbb{Z}\}$ then $[R:I] < \infty$

abstract-algebra ring-theory ideals

answered 2 hours ago Berci 60.2k

1

vote

0

answers

10

views

Limit expectation of $\mathbb{E}\min(\sigma_{2n}, 2n)$ for stopping times of a random walk

probability-theory random-walk stopping-times

modified 2 hours ago Did 247k

0

votes

1

answer

22

views

Monotonic equation

calculus linear-algebra monotone-functions

modified 2 hours ago SergGr 116

0

votes

0

answers

20

views

Taylor's expansion of a norm

real-analysis

asked 2 hours ago Jack 106

0

votes

2

answers

39

views

Math puzzles suitable for printing on a mug

recreational-mathematics education puzzle

answered 2 hours ago John Wayland Bales 13.9k

0

votes

0

answers

22

views

Incomplete regularized Gamma function recursive relation

functional-analysis gamma-function

modified 2 hours ago davidlowryduda♦ 74.5k

0

votes

0

answers

13

views

Find the extremals of the functional $\int\sqrt{x^2+y^2}\sqrt{1+(y'(x))^2}dx$?

polar-coordinates calculus-of-variations

asked 2 hours ago Yuchen Dong 61

0

votes

0

answers

15

views

Is the image of a metric automorphism under a measure-preserving mapping also a metric automorphism?

measure-theory dynamical-systems ergodic-theory

modified 2 hours ago Rocco 159

5

votes

0

answers

105

views

+100

Counterexample to Riemann sum limit

real-analysis riemann-integration

modified 2 hours ago WoodWorker 433

1

vote

1

answer

17

views

If $f\in BV(\mathbb{T})\cap C(\mathbb{T})$ does the Fourier series of $f$ converge uniformly to $f$?

fourier-series

answered 2 hours ago Bob 1,484

1

vote

0

answers

18

views

Showing monotonicity for ratio of binomial pmf and tail cdf

inequality probability-distributions binomial-distribution

modified 2 hours ago stats134711 177

1

vote

0

answers

24

views

Is this graph Hamiltonian and how to prove it is not?

graph-theory hamiltonian-path

modified 2 hours ago Haris 21

2

votes

1

answer

15

views

Compute the Mean Squared Error of $𝑇$

statistics

answered 2 hours ago Alexandros 16

1

vote

1

answer

133

views

Decide if a point is inside quadrangle

area

modified 2 hours ago Doug M 44.5k

1

vote

1

answer

23

views

Grothendieck group of tensor products

ring-theory modules k-theory

answered 2 hours ago Eric Wofsey 183k

1

vote

0

answers

16

views

Are these extensions separable.

abstract-algebra proof-verification

modified 2 hours ago Bernard 119k

2

votes

0

answers

11

views

Permutations for tilings / tessellations

permutations tiling tessellations

modified 3 hours ago N. F. Taussig 44k

3

votes

0

answers

20

views

Ordinary and covariant derivative inequality: $ \| w\|_1 \leq C\left( \| \frac{Dw}{dt} \|_0 + \|w\|_0 \right) $

differential-geometry riemannian-geometry smooth-manifolds connections global-analysis

modified 3 hours ago Nhat 1,042

0

votes

0

answers

19

views

Proof verification on integral function and absolute continuity

real-analysis proof-verification lebesgue-integral absolute-continuity

modified 3 hours ago eleguitar 151

2

votes

1

answer

897

views

Bounded subset with positive outer measure

measure-theory

modified 3 hours ago Eli Bashwinger 237

3

votes

1

answer

27

views

Question on Banach-Alaoglu theorem: Bounded subset of a set contained in the dual space

functional-analysis convergence weak-convergence duality-theorems dual-spaces

answered 3 hours ago Eric Wofsey 183k

1

vote

1

answer

42

views

Simplifying a solution to $x^2 = 4 + 2\sqrt{2}$

algebra-precalculus radicals

modified 3 hours ago J. W. Tanner 438

1

vote

0

answers

11

views

The monotonicity of a weighted entropy

linear-algebra probability sequences-and-series combinatorics limits

modified 3 hours ago El borito 575

2

votes

0

answers

13

views

The Jacobian and Particular Solutions to an Underdetermined Equation

pde exterior-algebra line-integrals jacobian multivariate-polynomial

modified 3 hours ago gt6989b 33.9k

2

votes

0

answers

10

views

Use the Central Limit Theorem to deduce that if $λ$ is large, then $X$ approximately has a normal distribution.

statistics

asked 3 hours ago Fabio Taccaliti 416

1

vote

0

answers

14

views

Mayer-Vietoris for twisted De Rham cohomology in Bott-Tu Differential Forms in Algebraic Topology

general-topology geometry differential-geometry algebraic-topology differential-topology

asked 3 hours ago user45765 2,689

1

vote

0

answers

9

views

A Question about Even Harmonic Functions and Fractional Laplacian

complex-analysis harmonic-analysis

asked 3 hours ago yoshi 1,186

3

votes

2

answers

39

views

Two sided ideals are maximal right ideal iff they are maximal left ideal.

abstract-algebra ring-theory maximal-and-prime-ideals

modified 4 hours ago lonza leggiera 431

2

votes

0

answers

19

views

If graph $G$ is connected and has at least two vertices, prove that there exist vertices $u$ and $v$ so graphs $G-u$ and $G-v$ are connected

graph-theory

modified 4 hours ago Haris 21

1

vote

0

answers

7

views

problem in input/putput and decision variable of RL? Could we consider input and output on the decision variables on a feedback problemsuch as RL

machine-learning mathematical-modeling

modified 4 hours ago user10296606 106

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