User ramanujan_dirac - Mathematics Stack Exchange

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1

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0

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29

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Diagonalizing/eigenvalues of a particular infinite dimensional matrix

21h ago ramanujan_dirac 998

0

votes

1

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83

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Problem evaluating an improper integral $\int_0^{\infty} \frac{(\sin{2x}-2x\cos{2x})^2}{x^6}$ using fourier transform

fourier-analysis improper-integrals integral-transforms

apr 30 at 13:45 Ron Gordon 26.7k

1

vote

1

answer

48

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Evaluating improper integrals using laplace transform

improper-integrals laplace-transform integral-transforms

apr 30 at 5:58 Mhenni Benghorbal 14.2k

0

votes

1

answer

59

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Condition for the inverse laplace transform of a function to exist and bromwich integral

complex-analysis laplace-transform integral-transforms

apr 30 at 2:19 Random Variable 1,701

5

votes

1

answer

57

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Solving an initial value ODE problem using fourier transform

differential-equations fourier-analysis integral-transforms

apr 29 at 11:06 ramanujan_dirac 998

0

votes

2

answers

66

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Solving an integral equations using fourier transform

fourier-analysis integral-transforms integral-equations

apr 29 at 16:17 Ron Gordon 26.7k

0

votes

3

answers

77

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Cauchy principal value of $\int_{\infty}^{-\infty}e^{-ax^2}\cos(2abx) \,dx$

complex-analysis improper-integrals residue-calculus

may 3 at 18:16 doraemonpaul 3,072

1

vote

2

answers

139

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$\int_0^{2\pi}e^{a \cos{\theta}}\cos({\sin{\theta}})\,d\theta$ using residues

complex-analysis integral residue-calculus

apr 29 at 14:19 Ron Gordon 26.7k

4

votes

1

answer

64

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Prove that the ring of formal power series over a field is an UFD

abstract-algebra ring-theory

apr 27 at 9:53 YACP 9,245

1

4

votes

1

answer

87

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Field of fractions of $\mathbb{Q}[x,y]/\langle x^2+y^2-1\rangle$ [duplicate]

abstract-algebra commutative-algebra ring-theory

apr 26 at 14:27 Martin Brandenburg 23.1k

2

votes

5

answers

47

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Prove Principal Ideal Domain from Bezout's condition, and terminating divisibility chain

abstract-algebra ring-theory

apr 21 at 18:55 Community♦ 1

1

3

votes

1

answer

95

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Problem on a finite commutative ring with no zero divisors [duplicate]

abstract-algebra ring-theory

apr 11 at 11:17 Brian M. Scott 156k

1

vote

1

answer

83

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Laurent expansion of $\csc^2(\frac{\pi}{z})$ about $\frac{1}{3}$ for $|z-\frac{1}{3}| \lt \frac{1}{12}$

complex-analysis taylor-expansion laurent-series

may 6 at 10:07 Mhenni Benghorbal 14.2k

0

votes

1

answer

58

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Radius of convergence of $\sum_{-\infty}^{\infty}3^{-|n|}z^{2n}, z \in \mathcal{C}$

sequences-and-series complex-analysis convergence power-series

mar 31 at 7:26 Greg Martin 7,768

2

9

votes

2

answers

174

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What exactly is a Kähler Manifold?

differential-geometry differential-topology complex-geometry

mar 27 at 17:00 Rhys 1,306

5

votes

1

answer

108

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$\mathbb{C}\mathbb{P}^1$ is homeomorphic to $S^2$

general-topology manifolds riemann-surfaces

mar 7 at 7:00 ramanujan_dirac 998

1

vote

3

answers

93

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Question on alphabet of a free group and its generating set

abstract-algebra group-theory free-groups

mar 2 at 15:29 Loki Clock 592

1

vote

3

answers

215

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Topologist's sine curve is connected

real-analysis general-topology limit

feb 28 at 20:37 Stahl 3,627

2

3

votes

1

answer

107

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Mathematics and Physics prerequisites for mirror symmetry

algebraic-geometry algebraic-topology mathematical-physics quantum-field-theory

feb 27 at 9:16 Ehsan M. Kermani 3,334

1

7

votes

1

answer

177

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Normalizer of $S_n$ in $GL_n(K)$

abstract-algebra group-theory finite-groups

mar 5 at 1:33 Alex Becker♦ 28.4k

2

votes

1

answer

63

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Analyticity of $\frac{Log(z+4)}{z^2+i}$

complex-analysis analysis analyticity

feb 24 at 13:08 julien 23.2k

3

8

votes

1

answer

229

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The physical meaning of the tensor product

linear-algebra abstract-algebra representation-theory tensor-products

feb 21 at 19:10 Haskell Curry 11.1k

2

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0

answers

89

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Algebraic curves and riemann surfaces

complex-analysis algebraic-geometry soft-question

feb 19 at 12:17 ramanujan_dirac 998

1

2

votes

1

answer

80

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Normal subsets of a Sylow p subgroup are conjugate if and only if they are $N_G(P)$ conjugate.

abstract-algebra group-theory sylow-theory

feb 17 at 7:22 Jim 8,387

2

votes

3

answers

341

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Topology Prerequisites for Algebraic Topology

general-topology algebraic-topology soft-question

feb 18 at 4:11 Gastón Burrull 1,225

3

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0

answers

50

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Let G be finite and let $p$ be the smallest prime dividing $|G|$. Let $H \le G$ be of index $p$. Prove that $H$ is a normal subgroup of $G$. [duplicate]

abstract-algebra group-theory finite-groups

feb 10 at 10:30 Ludolila 595

6

16

votes

2

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324

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Roadmap to study Atiyah-Singer index theorem

differential-geometry algebraic-topology soft-question differential-topology

feb 5 at 3:56 Eric O. Korman 7,570

1

6

votes

2

answers

100

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$N_1,N_2,N_3 \unlhd G, N_i\cap N_j =\{e\}, G = N_iN_j$. Want to show that $G$ is abelian, $N_i$ are isomorphic.

abstract-algebra group-theory finite-groups

feb 4 at 15:54 Seirios 8,977

3

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3

answers

143

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Every group of order 203 with a normal subgroup of order 7 is abelian

abstract-algebra group-theory finite-groups

jan 27 at 6:59 ramanujan_dirac 998

1

2

votes

2

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111

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Inner automorphism of a subgroup

abstract-algebra group-theory finite-groups

jan 23 at 20:27 Tobias Kildetoft 4,756

ramanujan_dirac

60 Questions