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K.defaoite
  • Member for 6 years, 1 month
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19 votes
2 answers
3k views

An amazing integral with a typo

8 votes
2 answers
2k views

Why do keyhole contours work?

4 votes
0 answers
161 views

Perelman's theorem in dimensions other than 3 (and 4) - why is it "easy"?

4 votes
1 answer
181 views

Integral formula for solution of Laplace's equation in polar coordinates

4 votes
1 answer
633 views

Why is the Black-Scholes equation "ill-posed for forward time"?

4 votes
2 answers
192 views

Minimum area of an art gallery?

4 votes
0 answers
126 views

An interesting sum arising from a statistics problem [duplicate]

4 votes
1 answer
324 views

dot product in a general coordinate system

4 votes
1 answer
157 views

This Meijer G function identity on Wikipedia is **wrong**. Can it be corrected?

3 votes
2 answers
177 views

Some strange properties of the sine integral

3 votes
2 answers
2k views

What does "translation invariant" mean for linear differential functionals?

3 votes
3 answers
457 views

What is the chance that an infinite series of random numbers will, at some point, repeat all previously generated numbers in that order? [duplicate]

3 votes
1 answer
334 views

Integrating non constant vectors in curvilinear coordinates

3 votes
0 answers
158 views

Asymptotic density and sums of subsequences

3 votes
3 answers
201 views

Paradigm shifts from $2\to 3$

2 votes
1 answer
91 views

Infer the convergence of the coefficients of a power series based on the radius of convergence?

2 votes
1 answer
290 views

Is this a "contravariant derivative"? (tensor Laplacian)

2 votes
1 answer
3k views

Matrix notation: Double underlines??

2 votes
0 answers
139 views

How do we define fractional derivatives for complex argument functions?

2 votes
1 answer
229 views

How to solve this biharmonic equation? (Viscous fluid flow)

2 votes
1 answer
74 views

Can we apply quadratic optimization in complex inner product spaces?

2 votes
1 answer
43 views

Interchanging limits and integrals for Cauchy sequences in $L^p$

2 votes
1 answer
109 views

Problems with the proof of theorem 2 in section 5.3 in LC Evans PDE book (second edition)

2 votes
0 answers
47 views

How exactly are area integrals in the complex plane defined?

1 vote
0 answers
13 views

Extension of Pohozaev's identity to the whole domain $\mathbb R^m$

1 vote
0 answers
79 views

Difficulties verifying an initial condition (Evans PDE)

1 vote
1 answer
477 views

Determinant of the strain tensor?

1 vote
1 answer
87 views

Is $\nabla_j\nabla^iu^j=(\operatorname{grad}\operatorname{div}u)^i$ in flat space?

1 vote
1 answer
130 views

How does Mathematica compute certain "bad" cases of the Meijer G function?

1 vote
0 answers
115 views

About the "dot product" in the material derivative