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0

answers

2

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Number of drawings with replacement with at most two times the same draw

probability

asked 3 mins ago eti902 477

0

votes

0

answers

4

views

Showing the solution to a differential equation is periodic

ordinary-differential-equations

asked 3 mins ago UnKnoWnZ 121

2

votes

2

answers

21

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Differential Equation Solution By Power Series

sequences-and-series ordinary-differential-equations solution-verification power-series factorial

modified 3 mins ago Martin Argerami 161k

0

votes

0

answers

8

views

Descartes' Rule of Signs Proof Question

algebra-precalculus

modified 3 mins ago Blue 62.4k

1

vote

2

answers

35

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How to calculate $\int_{C}{}\frac{\bar{z}}{z+i} dz$ if $C$ is a circle: $|z+i|=3$?

complex-analysis definite-integrals complex-numbers circles contour-integration

modified 4 mins ago Kevin. S 2,015

0

votes

0

answers

12

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Proof verification: Atiyah-Macdonald Exercise 3.7(i)

commutative-algebra localization

modified 5 mins ago klein4 457

0

votes

0

answers

8

views

Need help in understanding (a part of) the proof of John's Theorem

linear-algebra geometry proof-explanation convex-analysis convex-geometry

asked 6 mins ago strawberry-sunshine 3,445

3

votes

2

answers

50

views

Value of $i^\sqrt3$

complex-analysis complex-numbers exponentiation

answered 7 mins ago mrsamy 1,581

0

votes

1

answer

15

views

An example where great-circle distance gives a different answer than $L_2$-norm

linear-algebra geometry

answered 7 mins ago Rivers McForge 3,167

0

votes

2

answers

33

views

Does a function exist that maps the natural numbers to the natural numbers excluding multiples of 2 and 3 and starting at an arbitrary point?

number-theory discrete-mathematics

modified 8 mins ago Mike 9,430

1

vote

0

answers

21

views

What is the Style of Theorem Proofs in Set Theory?

elementary-set-theory proof-writing

modified 11 mins ago Ziqi Fan 784

0

votes

0

answers

5

views

What are the chances of at least one seed sprouting for each variety?

probability

modified 11 mins ago no lemon no melon 674

0

votes

2

answers

58

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Find all polynomials $P(x)$ such that $2 P\left(2 x^{2}-1\right)=P(x)^{2}-2$

polynomials proof-explanation contest-math functional-equations

modified 21 mins ago Eric Wofsey 258k

2

votes

1

answer

1k

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How to determine whether a piecewise function has a derivative?

calculus derivatives

modified 22 mins ago Community♦ 1

1

vote

1

answer

15

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$\lim_{x \to \infty} \frac {\log(|\sin(x)|)}{\log(x)}$

real-analysis limits continuity

answered 23 mins ago M. Rahmat 1,011

3

votes

2

answers

25

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Is there a way to characterize all nowhere dense sets of $\mathbb{R}$?

real-analysis metric-spaces

modified 23 mins ago Noah Schweber 186k

0

votes

0

answers

9

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Product in the Category of $L$-structures with Homomorphisms.

model-theory

modified 28 mins ago Bertrand Wittgenstein's Ghost 675

1

vote

0

answers

24

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Do discrete geometric objects exist in the same space as non-discrete geometric object?

geometry discrete-geometry

modified 30 mins ago William 537

0

votes

0

answers

9

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Cauchy's formula in a half-plane

complex-analysis cauchy-integral-formula

modified 1 min ago KK Wong 175

0

votes

1

answer

40

views

heat equation with cylindrical symmetry using separation of variables

partial-differential-equations bessel-functions heat-equation

answered 35 mins ago Semiclassical 13.4k

0

votes

1

answer

9

views

Given a string of length $n$, how many substrings of length $k$ of consecutive items exist?

combinations

answered 35 mins ago Reneo 149

0

votes

0

answers

8

views

Lower bound of confidence intervall

confidence-interval

modified 37 mins ago QWERTYZ 45

0

votes

0

answers

13

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Eigenvalue of Bessel function

bessel-functions

modified 41 mins ago Stephanie 61

36

votes

0

answers

1k

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Proving that $\int_0^\pi\frac{x\ln(1-\sin x)}{\sin x}dx=3\int_0^\frac{\pi}{2}\frac{x\ln(1-\sin x)}{\sin x}dx$

calculus integration definite-integrals logarithms alternative-proof

modified 43 mins ago epte 44

0

votes

1

answer

23

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Concrete Mathematics Exercise 3.22 Solution Explanations

summation ceiling-and-floor-functions

modified 45 mins ago peterwhy 15.7k

0

votes

1

answer

15

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Notation concatenation of tuples

notation

modified 46 mins ago Qiaochu Yuan 338k

3

votes

2

answers

52

views

What are the steps in breaking down the exponent in this limit analysis?

calculus limits

modified 48 mins ago Paramanand Singh 70.2k

4

votes

2

answers

138

views

The Fourier Transform of a Bessel function: $J_a(be^{-x}), a,b>0$

integration definite-integrals fourier-transform

modified 50 mins ago jwimberley 186

1

vote

0

answers

21

views

Find the product of the factors of $6^{12}$ that are congruent to $1 \pmod 7$

elementary-number-theory modular-arithmetic divisibility

asked 59 mins ago Neat Math 4,152

0

votes

0

answers

7

views

How does forward stepwise regression select variables

statistics regression least-squares

modified 1 hour ago Adrian 1,837

2

votes

0

answers

15

views

How do we define fractional derivatives for complex argument functions?

complex-analysis continuity fractional-calculus

asked 1 hour ago K.defaoite 4,542

0

votes

1

answer

15

views

Suppose that f is meromorphic in $\mathbb{C}$ such that $|f(z)|< |z|^{k}, \ |z|> R.$ Show that f is rational.

complex-analysis meromorphic-functions

answered 1 hour ago Robert Israel 397k

4

votes

2

answers

56

views

limit as x goes to infinty

calculus limits

answered 1 hour ago Barry Cipra 73k

0

votes

0

answers

19

views

why any field extension K/k with [K:k] = 2 is a pure extension?

abstract-algebra field-theory galois-theory extension-field

asked 1 hour ago studyhard 31

2

votes

1

answer

15

views

Coding $\omega$-sequences of 0,1 with $\mathbb{Z}$-sequences of 0,1

set-theory axiom-of-choice

answered 1 hour ago Noah Schweber 186k

1

vote

0

answers

33

views

How to explain how many callbacks routines

equivalence-relations set-partition

modified 1 hour ago Er Ren 11

3

votes

1

answer

3k

views

find a length of a triangle having two known sides and a median line

geometry

modified 1 hour ago Community♦ 1

0

votes

1

answer

16

views

epsilon delta limit proof of $\lim_{x \to 0} \arctan{(x)}=0$

limits epsilon-delta

answered 1 hour ago Measure me 982

1

vote

0

answers

14

views

A p-adic Fourier transform

integration number-theory p-adic-number-theory

asked 1 hour ago Gory 185

0

votes

1

answer

17

views

Asymptotic expansion derivation Airy function

complex-analysis airy-functions

modified 1 hour ago Claude Leibovici 178k

0

votes

1

answer

26

views

Proof of generalized open & closed Newton-Cotes formulas

integration reference-request numerical-methods quadrature

modified 1 hour ago HiterDean 468

4

votes

0

answers

19

views

Infection spread on a torus chessboard

combinatorics puzzle upper-lower-bounds combinatorial-game-theory cellular-automata

asked 1 hour ago user2471 255

1

vote

1

answer

17

views

Proving uniqueness of intersection multiplicities

algebraic-geometry proof-explanation algebraic-curves

answered 1 hour ago Hank Scorpio 496

2

votes

1

answer

11

views

Is a Radon measure always positive on non-empty open sets?

measure-theory borel-measures

answered 1 hour ago peek-a-boo 17.7k

0

votes

0

answers

14

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Integral of differential forms

complex-analysis algebraic-geometry

asked 1 hour ago M. Rahmat 1,011

0

votes

0

answers

24

views

Differentiate under the integral sign: $ \int_0^{2π} e^{cos(x)}cos(sinx) \, \mathrm{d}x $

integration ordinary-differential-equations partial-differential-equations definite-integrals leibniz-integral-rule

asked 1 hour ago Sam Haze 25

1

vote

1

answer

33

views

$L^1$ norm of a function is greater than the norm of its root

algebraic-number-theory p-adic-number-theory

answered 1 hour ago Torsten Schoeneberg 14k

1

vote

1

answer

15

views

Proving that quotient space is pre-Hilbert and not separable

real-analysis optimization solution-verification quotient-spaces

modified 1 hour ago GReyes 8,363

1

vote

0

answers

30

views

Conjugacy class of $\operatorname{Homeo}(\mathbb R)$.

general-topology group-theory continuity normal-subgroups

modified 1 hour ago Kevin. S 2,015

0

votes

0

answers

10

views

How to solve this inversely proportion question for part b?

inverse word-problem

asked 1 hour ago user234568 143

1

vote

1

answer

11

views

Probability of picking a complete set of x items from an indefinitely large field after y tries

statistics

answered 1 hour ago GossipM 21

0

votes

0

answers

28

views

Misunderstanding limit of Rough Path

analysis curves rough-path-theory

modified 1 hour ago Furdzik 140

0

votes

1

answer

14

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Statistics how to calculate likelihood over several draws

probability statistics

modified 1 hour ago jlammy 5,025

4

votes

2

answers

83

views

Tangent space of a product of algebraic group.

algebraic-geometry algebraic-groups tangent-spaces

answered 1 hour ago Hank Scorpio 496

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