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2

votes

1

answer

31

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Question about wording of Linear Algebra

linear-algebra linear-transformations

modified just now Prince M 2,013

0

votes

1

answer

14

views

Find $m, p$ for $6^m +1 = 777\ldots 7$ ( p times 7 )

number-theory elementary-set-theory

answered 5 secs ago rtybase 11k

0

votes

1

answer

8

views

Find the dimension of the range of $T$.

linear-algebra

modified 29 secs ago Omnomnomnom 128k

0

votes

0

answers

2

views

Rudin functional analysis, theorem 3.27

functional-analysis proof-explanation topological-vector-spaces

asked 1 min ago user8469759 1,533

0

votes

0

answers

2

views

Conditional Expectation of Multivariate Gaussian in Expectation Maximization

algorithms normal-distribution conditional-expectation expected-value

asked 1 min ago Filip 177

0

votes

1

answer

16

views

Proving the infimum of a set?

real-analysis

modified 3 mins ago st.math 143

0

votes

1

answer

23

views

If $X_1$ and $X_2$ are uniformly distributed random variables with parameters $0$ and $1$, what is the distribution of $Y = X_1 + X_2$?

probability uniform-distribution

modified 3 mins ago JonathanZ 2,154

1

vote

0

answers

5

views

A proper Vertex, Edge, and Face coloring of a surface Graph

graph-theory coloring

modified 4 mins ago Melody 810

1

vote

1

answer

21

views

Is it true that for a Boolean Algebra, $a'b+(abc)'+c(b'+a)=b'+c'$?

examples-counterexamples boolean-algebra

answered 4 mins ago user376343 3,813

1

vote

1

answer

27

views

How to derive the variance of the mean of predictions from a linear regression model?

statistics statistical-inference regression linear-regression

modified 4 mins ago d.k.o. 9,585

4

votes

1

answer

21

views

+100

Smallest 3d grid cell shape that is “faithful” under isometries of the grid

geometry

answered 6 mins ago jmerry 9,921

1

vote

0

answers

9

views

Why are integrals and summations useful in computer science and what do these function mean?

calculus integration definite-integrals summation computer-science

asked 7 mins ago Jodast 113

0

votes

1

answer

15

views

PDF transformation for many to one function

probability random-variables transformation

answered 9 mins ago Kavi Rama Murthy 62.1k

2

votes

2

answers

31

views

A trig integral with a tangent substitution

calculus integration definite-integrals

answered 10 mins ago Song 14.4k

0

votes

1

answer

45

views

Graphs Approaching Asymptotes

functions asymptotics graphing-functions

answered 11 mins ago Robert Howard 2,040

0

votes

0

answers

8

views

Finding powers of 2 and 3 in modular arithmetic

modular-arithmetic

asked 13 mins ago Amanda M 1

1

vote

2

answers

35

views

Relation between Holder norm and fractional laplacian

functional-analysis analysis harmonic-analysis

answered 14 mins ago Shalop 9,364

1

vote

1

answer

26

views

If $(a,k)=(b,m)=1$, prove that $(ab,km)=(a,m)(b,k)$.

analytic-number-theory multiplicative-function ramanujan-summation

modified 15 mins ago Bill Dubuque 211k

0

votes

0

answers

5

views

Rudin functional analysis, Definition 3.26

integration functional-analysis proof-verification topological-vector-spaces

asked 15 mins ago user8469759 1,533

0

votes

2

answers

40

views

Let $a,b,c$ be the side lengths…find $\frac{\tan C}{\tan A}+\frac{\tan C}{\tan B}$.

geometry trigonometry

modified 17 mins ago John Omielan 3,150

0

votes

0

answers

8

views

Maximum entropy distribution given constrained minimum, maximum, and mean

probability entropy

modified 21 mins ago Gregory Nisbet 709

1

vote

0

answers

14

views

prove Bézout's Theorem: few axioms, restricted language

algebraic-geometry model-theory

modified 21 mins ago Bernard 121k

0

votes

1

answer

8

views

How to prove Prove $E[g(X)h(Y)|X]=g(X)E[h(Y)|X]$ for random variables jointly continuous

probability conditional-expectation

answered 23 mins ago Kavi Rama Murthy 62.1k

0

votes

0

answers

14

views

What is the term for the smallest number that two numbers can both divide into evenly?

terminology

asked 23 mins ago temporary_user_name 349

0

votes

0

answers

7

views

Integration of forms over manifolds

real-analysis manifolds manifolds-with-boundary

asked 24 mins ago Benja 13

0

votes

0

answers

13

views

Probability of winning \$1 in a slot machine after spending \$5

probability statistics

modified 25 mins ago Sadie L 3

3

votes

0

answers

12

views

Abstract algebra subgroup proof verification

abstract-algebra group-theory proof-verification proof-writing finite-groups

asked 27 mins ago ForIgreaterthanJ 53

3

votes

2

answers

101

views

+50

Partial sums of binomial series

probability combinatorics reference-request binomial-coefficients

answered 27 mins ago G Cab 19.6k

-1

votes

1

answer

20

views

Intersection between an AP and GP (solving equation)

sequences-and-series algebra-precalculus logarithms

answered 30 mins ago Roddy MacPhee 72

4

votes

2

answers

729

views

For which values of $p,q$ does the integral $\int_0^1 x^p (\ln\frac{1}{x})^qdx$ converges?

calculus improper-integrals

modified 33 mins ago Community♦ 1

5

votes

1

answer

30

views

Transient random walk on 3-color 3-regular tree

combinatorics graph-theory random-walk trees coloring

answered 35 mins ago Mr. G 595

2

votes

1

answer

11

views

Let $A$ be such a set that its power set $P(A)$ is a chain with inclusion as the partial ordering. What can be said about $P(A)$?

combinatorics set-theory

answered 38 mins ago Stefan Mesken 14.6k

0

votes

1

answer

16

views

minimal polynomial irreducible polynomial in $F[t]$ if the only $T$-invariant subspaces are $0$ and $V$

linear-algebra

answered 38 mins ago jmerry 9,921

0

votes

1

answer

7

views

Multiply diagonal of matrix by a set of values

matrices matrix-decomposition

answered 41 mins ago Daniel McLaury 15.7k

0

votes

0

answers

14

views

Bayes Theorem with change of measure

stochastic-processes conditional-expectation bayes-theorem expected-value radon-nikodym

modified 46 mins ago bitesizebo 1,496

2

votes

1

answer

59

views

Is this a counterexample?

field-theory galois-theory cyclic-groups galois-extensions separable-extension

modified 47 mins ago Jyrki Lahtonen 109k

0

votes

0

answers

6

views

Fitting a Gaussian locally (instead of Taylor series) based on derivatives

taylor-expansion

asked 48 mins ago Make42 180

3

votes

4

answers

22

views

Derivative of sigmoid function that contains vectors

calculus derivatives matrix-calculus

modified 49 mins ago Minus One-Twelfth 1,273

2

votes

1

answer

44

views

Brocard's theorem - $O$ is orthocenter of $\Delta EFI$

geometry trigonometry euclidean-geometry circle geometric-transformation

modified 54 mins ago greedoid 43.7k

3

votes

1

answer

23

views

Algebraic proof that two statements of the fundamental theorem of algebra are equivalent

real-analysis algebra-precalculus proof-explanation

modified 55 mins ago egreg 182k

4

votes

1

answer

72

views

Are valued-quiver species and combinatorial species related?

category-theory representation-theory quiver combinatorial-species

answered 57 mins ago Joe Moeller 330

6

votes

10

answers

32k

views

Example of a relation that is symmetric and transitive, but not reflexive

discrete-mathematics examples-counterexamples relations

answered 59 mins ago user647493 9

-1

votes

0

answers

39

views

proving $ \frac{1}{2x^2} - \frac{2}{3x^3} + \frac{3}{4x^4} - \frac{4}{5x^5} \pm … >0$

calculus combinatorics number-theory analysis

asked 1 hour ago Amir Hosein Eskandani 28

1

vote

0

answers

13

views

Combinatorics with anagrams

combinatorics

asked 1 hour ago Daniel Oscar 308

2

votes

3

answers

82

views

Generating functions ( recurrence relations )

generating-functions

answered 1 hour ago Martin Hansen 29

0

votes

0

answers

12

views

How do we relate the exterior derivative of a scalar function to the “differential?”

manifolds vector-analysis

asked 1 hour ago user49404 52

0

votes

1

answer

7

views

Transforming a Plane

matrices proof-verification

answered 1 hour ago amd 30.5k

2

votes

1

answer

25

views

What uniquely characterizes equivalence classes of eventually equal binary sequences?

set-theory equivalence-relations descriptive-set-theory

answered 1 hour ago Noah Schweber 125k

0

votes

0

answers

4

views

The open affine subsets of an algebraic variety $X$ form an open base for the topology of $X$

algebraic-geometry sheaf-theory coherent-sheaves zariski-topology

asked 1 hour ago Prince M 2,013

1

vote

2

answers

28

views

How to deterministically pick a vector that is guaranteed to be non-parallel to the given one?

vectors cross-product

answered 1 hour ago amd 30.5k

1

vote

1

answer

17

views

How to picture a filtration generated by a Brownian motion?

brownian-motion filtrations

modified 1 hour ago Henno Brandsma 110k

2

votes

1

answer

14

views

how to find a solution of an np complete problem given a solution to another np complete problem?

np-complete

answered 1 hour ago Kyle Jones 1,266

2

votes

0

answers

34

views

Does this property of sets and functions hold for a general topos?

category-theory topos-theory

modified 1 hour ago Gennaro Pasquale 110

1

vote

0

answers

19

views

Distributing pairs of coloured socks to people

combinatorics combinations

modified 1 hour ago EJJ 18

1

vote

1

answer

22

views

Matrix calculus - Derivative of von Neumann entropy

linear-algebra matrix-calculus

answered 1 hour ago greg 8,515

0

votes

0

answers

9

views

In a convex lattice, if $x$ is minimal, then each $y \le x$ is of the form $t x$ for some $t \in (0,1)$

convex-analysis lattice-orders

asked 1 hour ago xen 3,086

7

votes

1

answer

109

views

Attempt on fractional tetration

tetration power-towers

modified 1 hour ago 193406573160514765gdhssg 11

0

votes

1

answer

31

views

Derivative of Least Squares with L2 Norm

calculus derivatives partial-derivative machine-learning

answered 1 hour ago MachineLearner 31

0

votes

0

answers

12

views

Largest solution of a linear system

linear-algebra matrices eigenvalues-eigenvectors singularvalues

asked 1 hour ago Tanj 139

2

votes

2

answers

53

views

non isomorphism between $A^1$ and zero set of $y^2-x^3=0$'s coordinate ring by cohomology argument?

abstract-algebra algebraic-geometry

modified 1 hour ago Pedro Tamaroff♦ 97k

4

votes

0

answers

56

views

Heesch numbers in 3D

geometry recreational-mathematics 3d tiling open-problem

modified 1 hour ago Ed Pegg 9,914

1

vote

1

answer

10

views

Example of an unbounded operator this is symmetric but not essentially self adjoint

functional-analysis

answered 1 hour ago DisintegratingByParts 59.4k

0

votes

1

answer

20

views

Chapter 3 Problem 23 Luenberger Optimization by vector space methods

optimization hilbert-spaces

answered 1 hour ago Pebeto 81

1

vote

2

answers

15

views

In Support-Vector-Machine, why is the hyperplane given by $(p-1)$ dimensions?

machine-learning data-analysis

answered 2 hours ago Vinyl_coat_jawa 2,629

0

votes

1

answer

26

views

Using Velu's formulas in MAGMA

elliptic-curves arithmetic-geometry magma-cas

answered 2 hours ago djao 121

3

votes

1

answer

52

views

Area of Mandelbrot set: Uniform convergence in Laurent series method

complex-analysis complex-dynamics

modified 2 hours ago user30523 551

2

votes

0

answers

19

views

2-vertex-connected Graph must contain a cycle

proof-verification graph-theory

modified 2 hours ago ugeae 11

0

votes

0

answers

12

views

A third way to solve linear functional equations inspired by lacunary series

sequences-and-series complex-analysis functional-equations lacunary-series

modified 2 hours ago frogeyedpeas 7,532

2

votes

1

answer

19

views

Bounded sequence in dual with any weak*convergent subsequence

functional-analysis analysis convergence weak-convergence

modified 2 hours ago K.Power 2,962

0

votes

0

answers

17

views

Simplify formula by removing sum from it

summation

modified 2 hours ago Acccumulation 7,019

0

votes

1

answer

12

views

Fractional Knapsack Problem Linear Time

algorithms recursive-algorithms

modified 2 hours ago Disenchanted Toad 21

2

votes

2

answers

32

views

Circle measurement of Archimedes

geometry euclidean-geometry polygons

modified 2 hours ago Aretino 23.9k

0

votes

0

answers

22

views

How to use differentials to estimate the change in y?

calculus approximation

asked 2 hours ago J98 12

1

vote

0

answers

19

views

How to see that this space with two vertices and four edges is homotopy equivalent to $S^1 \vee S^1 \vee S^1$?

algebraic-topology intuition homotopy-theory

asked 2 hours ago Wolfgang 4,277

2

votes

0

answers

59

views

+50

Ensemble MCMC via Goodman and Weare (2010)

markov-chains sampling monte-carlo

modified 2 hours ago Alexis 78

1

vote

1

answer

29

views

Transpose of matrices

linear-algebra operator-theory

answered 2 hours ago probablyme 13

1

vote

0

answers

12

views

Partial Differential Equation using Fourier Sine Transform

pde fourier-transform

asked 2 hours ago Jonathan Aguilera 46

0

votes

0

answers

21

views

Hilbert Theory: validity in fields other than complex

functional-analysis analysis fourier-analysis

asked 2 hours ago Daniel Li 719

0

votes

0

answers

22

views

For every class $C$, find the unique class of “hereditarily C sets”.

logic set-theory

modified 2 hours ago Mike 724

0

votes

1

answer

14

views

Expected value and modulo

probability-theory modular-arithmetic random-variables

modified 2 hours ago Eyal Yeh 1

0

votes

1

answer

11

views

Trapezoidal iteration method for solving differential equation

ordinary-differential-equations eulers-method

answered 2 hours ago Ian 68.4k

1

vote

0

answers

17

views

Basic Question for limits and Taylor Expansion

limits taylor-expansion factorial

asked 2 hours ago Kautilya 6

4

votes

1

answer

87

views

Computing the index $\left(\mathbb Z\left[\frac{1+\sqrt{5}}{2}\right]:\mathbb Z \left[\sqrt{5}\right]\right)$?

abstract-algebra algebraic-number-theory quotient-group

modified 2 hours ago lhf 165k

1

vote

1

answer

17

views

DFA construction - How to construct an automaton that contains either 0 or 1 occurrences of 010?

automata

answered 3 hours ago Hagen von Eitzen 280k

0

votes

0

answers

11

views

Double convolution

probability-theory fourier-analysis brownian-motion

asked 3 hours ago Arjan Dhaliwal 13

7

votes

2

answers

160

views

Prove that the product of any two numbers between two consecutive squares is never a perfect square

number-theory elementary-number-theory

modified 3 hours ago Keith Backman 1,368

1

vote

0

answers

20

views

Strong and weak limits in a dense set for a sequence of bounded operators

functional-analysis proof-verification weak-convergence

modified 3 hours ago André Muchon 135

2

votes

0

answers

37

views

Solve differential equation $-f'(x)= a_1 f(a_2 x+a_3)$ with $f(0)=1$.

ordinary-differential-equations

modified 3 hours ago Lisa 653

0

votes

0

answers

8

views

Connectivity of planar embedding of graph

graph-theory terminology graph-connectivity

asked 3 hours ago Matthew Matic 270

5

votes

0

answers

26

views

Approximating orthonormal basis in Hilbert space by orthonormal basis from dense subset

hilbert-spaces orthonormal

modified 3 hours ago Hanno 2,250

2

votes

0

answers

27

views

Green's function for $\Omega=\{ (x_1,x_2,x_3)\in \mathbb{R}^3:x_2,x_3>0 \}$

pde harmonic-functions laplacian greens-function

modified 3 hours ago Gaby Alfonso 982

0

votes

0

answers

6

views

Possible Growth Function for a hypothesis set

machine-learning

modified 3 hours ago alphacapture 2,155

3

votes

1

answer

302

views

Length of a Linearly Independent List $\le$ Length of a Space-Spanning List

linear-algebra proof-verification proof-explanation

modified 3 hours ago alphacapture 2,155

0

votes

0

answers

15

views

Let $f(x)$ be a monotonically non-decreasing (weakly increasing) function. What additional properties ensure $g(x) = xf(x)$ convex?

convex-analysis

modified 4 hours ago user89 573

8

votes

2

answers

1k

views

Show that the $\Delta$-complex obtained from $\Delta^3$ by performing edge identifications deformation retracts onto a Klein bottle.

algebraic-topology simplicial-complex

modified 4 hours ago Glorfindel 3,419

2

votes

0

answers

10

views

First fundamental group of $Q:=\{[x,y,z,t,u,v] \in \mathbb{R}P^5 |x^2+y^2+z^2-t^2-u^2-v^2=0\}$ and a covering of a quadric

general-topology algebraic-topology projective-geometry

asked 5 hours ago F.inc 448

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