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xotix

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complex-analysis

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94 Questions

Votes Activity Newest Views
 
7
votes
7
answers
815
views

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
Jan 7 '19 at 16:18 Rafa Budría 6,787
 
3
votes
1
answer
66
views

Irrationality of $\log_2(2015)$

elementary-number-theory rationality-testing
Jan 14 '18 at 17:34 José Carlos Santos 330k
 
2
votes
1
answer
70
views

Calculating an integral using a Fourier transform

integration complex-analysis fourier-transform
Feb 1 '19 at 16:28 Myeonghyeon Song 21k
 
2
votes
1
answer
45
views

Calculating a flux integral using Stokes vs. directly

integration stokes-theorem
Jan 26 '19 at 10:57 Bernard 164k
 
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
Oct 23 '18 at 20:11 md2perpe 18k
 
2
votes
2
answers
100
views

Extreme Value Problem: Minimizing vs. Maximizing

optimization extreme-value-analysis
Jul 9 '18 at 12:13 B. Goddard 27.1k
1
2
votes
2
answers
861
views

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
Aug 28 at 12:05 Calvin Khor 27k
 
1
vote
2
answers
35
views

Rewriting inequality given by a fraction

inequality
Jan 19 '20 at 12:32 JMP 16.2k
1
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
Feb 2 '19 at 15:54 Mostafa Ayaz 26.6k
1
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
Jan 2 '19 at 18:27 mechanodroid 41.2k
 
1
vote
0
answers
50
views

Coordination change for integrals and determinant of the jacobian matrix

calculus integration
Dec 31 '18 at 15:23 xotix 753
 
1
vote
2
answers
116
views

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

complex-analysis limits singularity
Dec 12 '18 at 15:57 José Carlos Santos 330k
 
1
vote
2
answers
91
views

Calculating the cross product of a cross product

cross-product curl
Nov 22 '18 at 19:40 J.G. 104k
 
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
1
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