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Dmitry Kazakov's user avatar
Dmitry Kazakov's user avatar
Dmitry Kazakov's user avatar
Dmitry Kazakov
  • Member for 10 years
  • Last seen more than 8 years ago
  • Zurich, Switzerland
15 votes
3 answers
11k views

Why does the order of summation of the terms of an infinite series influence its value?

5 votes
3 answers
957 views

Integrating over an area

3 votes
0 answers
856 views

Maximum modulus principle, 3 questions

3 votes
2 answers
443 views

Types of singularities of a function

2 votes
1 answer
81 views

Question regarding singularity of a complex function

2 votes
1 answer
180 views

Tangent plane to $f(x,y)=x^2ye^{1-xy}$

2 votes
0 answers
827 views

Moment of inertia of a cube about its diagonal

2 votes
1 answer
67 views

Fail to see the mistake when applying Cauchy's integral formulae

2 votes
1 answer
94 views

What is a rational way of factoring polynomials?

2 votes
1 answer
3k views

Hessian matrix of a function is constant

2 votes
3 answers
6k views

What are some special tricks on investigating limits?

2 votes
3 answers
89 views

How do I find $\lim\limits_{x \to 0^+}{\sin^2x \over e^{-1/x}}$?

2 votes
3 answers
406 views

Polar coordinates confusion

2 votes
1 answer
825 views

Is it true that for an inner product space a norm of a vector is defined unambiguously?

1 vote
1 answer
43 views

Angle measurement

1 vote
1 answer
214 views

Inverse Fourier transform: $\int_{-\infty}^{+\infty}\exp\left(-{(x-x_0)^2\over2\sigma_x}\right)\exp\left(-i\phi\right)\exp(-ix t)dx$

1 vote
1 answer
6k views

Fourier transform of a product of two rect functions

1 vote
1 answer
47 views

Can't figure out how one trick for defining a limit works

1 vote
2 answers
762 views

Find $\alpha$ and $\beta$ so that $f(x)$ is continuously differentiable

1 vote
2 answers
112 views

Stuck on finding the value of $\sum_{n=0}^\infty {n(n+1) \over 3^n}$

1 vote
1 answer
28 views

Stuck on defining the limit

1 vote
2 answers
42 views

Investigating a function with a parameter

1 vote
0 answers
564 views

Complex contour integral properties

1 vote
2 answers
548 views

I see some contradiction in the definition of orthogonal vectors

1 vote
1 answer
379 views

Determine flux using Gauss's theorem

1 vote
1 answer
57 views

Confused by the task given (involves identical inequality of functions)

1 vote
1 answer
109 views

Order of a zero of a complex polynomial

1 vote
1 answer
441 views

Some exam question on power series convergence

1 vote
3 answers
78 views

How can I plot the set $M:=\left\{\left(\begin{array}{c}x\\y\end{array}\right)\in \mathbb R^2:9x^4-16x^2y^2+9y^4\leq9\right\}$

0 votes
0 answers
191 views

Real-valued Fourier series representation