User xotix

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Why is $\lim_{x\to -\infty}\sqrt{x^2+5x+3}+x = \lim_{x\to -\infty}(-x)+x=\lim_{x\to -\infty}0 = 0$ not correct?

calculus limits

Dec 5 '18 at 2:48 Community♦ 1

3

votes

1

answer

302

views

Volume of intersection of a sphere and a paraboloid

calculus integration multivariable-calculus volume

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3

votes

1

answer

66

views

Irrationality of $\log_2(2015)$

elementary-number-theory rationality-testing

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2

votes

1

answer

70

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Calculating an integral using a Fourier transform

integration complex-analysis fourier-transform

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2

votes

1

answer

45

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integration stokes-theorem

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2

votes

3

answers

52

views

Show that any null sequence fulfils a specific limit

sequences-and-series convergence-divergence

Jan 24 '19 at 12:39 xotix 753

2

votes

2

answers

44

views

What happens if we let the wall thickness of a hollow ball go to zero?

analysis

Dec 19 '18 at 15:52 Arthur 176k

2

votes

1

answer

56

views

Field lines of a vector field

field-theory vector-analysis

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2

votes

2

answers

100

views

Extreme Value Problem: Minimizing vs. Maximizing

optimization extreme-value-analysis

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1

2

votes

2

answers

861

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How to get rid of the absolute value function when solving an ODE?

ordinary-differential-equations

Jun 26 '18 at 13:12 Lutz Lehmann 97.3k

2

votes

3

answers

48

views

Showing that a given set is a $\Bbb R$-Basis of $\Bbb C \times \Bbb C$

linear-algebra

Apr 4 '18 at 18:41 Emilio Novati 58.3k

2

votes

1

answer

161

views

Simple exersice using CRT

number-theory chinese-remainder-theorem

Jan 14 '18 at 16:16 GNUSupporter 8964民主女神地下教會 16.9k

2

votes

1

answer

3k

views

Calculating generalized eigenvectors

eigenvalues-eigenvectors

Feb 6 '17 at 17:32 Emilio Novati 58.3k

1

2

votes

1

answer

35

views

Solving equation of motion for velocity

ordinary-differential-equations

Jan 29 '17 at 13:15 Joseph Quarcoo 304

1

2

votes

1

answer

55

views

Solving a simple inhomogenous differential equation

ordinary-differential-equations

Jan 17 '17 at 10:08 Lutz Lehmann 97.3k

1

vote

1

answer

52

views

Solving extremal value problems with boundaries using lagrange-multipliers

lagrange-multiplier

Feb 26 at 1:26 boojum 453

1

vote

1

answer

120

views

Uniformly distributed points on unit disk

statistics

Oct 4 at 13:49 David K 76.5k

1

vote

2

answers

2k

views

Solving a linear least squares problem with trigonometric functions

least-squares

Sep 15 at 18:56 dantopa 8,571

1

vote

1

answer

89

views

Classical solution to PDE using M.o.C

partial-differential-equations characteristics

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1

vote

2

answers

35

views

Rewriting inequality given by a fraction

inequality

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1

vote

0

answers

48

views

Weak Solution for Cauchy Problem of Burgers Equation

partial-differential-equations hyperbolic-equations

Jan 18 '20 at 16:21 EditPiAf 18.4k

1

vote

1

answer

55

views

Series area of convergence

calculus sequences-and-series convergence-divergence

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1

vote

1

answer

61

views

Determining the type of singularities

complex-analysis trigonometry proof-verification laurent-series singularity

Feb 2 '19 at 10:54 José Carlos Santos 330k

1

vote

1

answer

178

views

Derivative of cross product

derivatives multilinear-algebra cross-product

Jan 20 '19 at 7:53 hypernova 5,602

1

vote

3

answers

46

views

Solving an ODE by deriving it to get a nice form

ordinary-differential-equations

Jan 16 '19 at 12:25 xotix 753

1

vote

1

answer

38

views

Flow integral in $\mathbb R^2$

integration

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1

vote

0

answers

50

views

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calculus integration

Dec 31 '18 at 15:23 xotix 753

1

vote

2

answers

116

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Analyzing isolated singularities using $\lim_{z\to z_0}(z-z_0)f(z)$

complex-analysis limits singularity

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1

vote

2

answers

91

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cross-product curl

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1

vote

1

answer

79

views

Solving a ODE using variation of parameters: $y''+4y=\frac1{\sin(2x)}$

ordinary-differential-equations

Aug 12 '18 at 10:17 Martin Sleziak 52.2k

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94 Questions

Why is $\lim_{x\to -\infty}\sqrt{x^2+5x+3}+x = \lim_{x\to -\infty}(-x)+x=\lim_{x\to -\infty}0 = 0$ not correct?

Volume of intersection of a sphere and a paraboloid

Irrationality of $\log_2(2015)$

Calculating an integral using a Fourier transform

Calculating a flux integral using Stokes vs. directly

Show that any null sequence fulfils a specific limit

What happens if we let the wall thickness of a hollow ball go to zero?

Field lines of a vector field

Extreme Value Problem: Minimizing vs. Maximizing

How to get rid of the absolute value function when solving an ODE?

Showing that a given set is a $\Bbb R$-Basis of $\Bbb C \times \Bbb C$

Simple exersice using CRT

Calculating generalized eigenvectors

Solving equation of motion for velocity

Solving a simple inhomogenous differential equation

Solving extremal value problems with boundaries using lagrange-multipliers

Uniformly distributed points on unit disk

Solving a linear least squares problem with trigonometric functions

Classical solution to PDE using M.o.C

Rewriting inequality given by a fraction

Weak Solution for Cauchy Problem of Burgers Equation

Series area of convergence

Determining the type of singularities

Derivative of cross product

Solving an ODE by deriving it to get a nice form

Flow integral in $\mathbb R^2$

Coordination change for integrals and determinant of the jacobian matrix

Analyzing isolated singularities using $\lim_{z\to z_0}(z-z_0)f(z)$

Calculating the cross product of a cross product

Solving a ODE using variation of parameters: $y''+4y=\frac1{\sin(2x)}$