User Pascal Engeler

11 votes

3 answers

3k views

Is it possible to solve this equation by hand?

algebra-precalculus

asked Feb 28, 2014 at 19:19

9 votes

1 answer

10k views

Integrate complex conjugate

complex-integration

asked Jul 17, 2013 at 13:43

5 votes

1 answer

3k views

Preimage of open pathwise connected set is pathwise connected

continuity connectedness

asked Jul 23, 2013 at 14:50

3 votes

3 answers

547 views

Strange Partial Fractions Decomposition

partial-fractions

asked Jul 17, 2013 at 13:33

3 votes

3 answers

147 views

Value of this infinite sum

summation

asked Jul 8, 2013 at 15:10

3 votes

1 answer

755 views

Splitting short exact sequence of space groups

abstract-algebra group-theory homological-algebra exact-sequence

asked Jun 9, 2014 at 14:46

3 votes

0 answers

80 views

Show that a certain operator is symmetric

linear-algebra

asked Jul 15, 2014 at 7:27

3 votes

1 answer

681 views

Show that map is conformal

complex-analysis logarithms

asked Jul 23, 2013 at 10:12

3 votes

1 answer

75 views

Parametrization of unit sphere in $\mathbb{R}^3$

real-analysis trigonometry

asked Jul 25, 2013 at 14:11

2 votes

1 answer

104 views

Facts about the tensor product

tensor-products multilinear-algebra

asked Jul 24, 2013 at 14:26

2 votes

1 answer

668 views

Taylor expansion of the electrostatic potential $1/\|\cdot \|$

taylor-expansion vector-analysis potential-theory

asked Jul 10, 2014 at 14:10

1 vote

1 answer

291 views

Prove that for density operators, if $\rho=\sum_i \rho_i P_i$ then $\log\rho=\sum_i P_i\log \rho_i$

linear-algebra spectral-theory

asked Jul 21, 2014 at 15:32

1 vote

2 answers

124 views

$-\varepsilon\log(x)\overset{?}{\geq} -\log(\varepsilon x)$

real-analysis inequality logarithms

asked Jul 21, 2014 at 21:17

1 vote

2 answers

144 views

DFT of binomial coefficients

binomial-coefficients summation

asked Jul 9, 2013 at 11:12

1 vote

0 answers

49 views

Statement about density operators, proof feedback

linear-algebra quantum-mechanics proof-verification

asked Jul 22, 2013 at 19:10

1 vote

2 answers

134 views

How to prove two trigonometric identities

trigonometry

asked Jul 24, 2013 at 10:16

0 votes

1 answer

1k views

Powers of a unitary matrix

linear-algebra

asked Jul 22, 2013 at 10:28

0 votes

1 answer

48 views

Compute gradient of this expression more quickly

vector-analysis

asked Jul 9, 2014 at 12:44

0 votes

0 answers

605 views

Commuting self adjoint operators

linear-algebra

asked Jul 26, 2013 at 14:42

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19 Questions

Is it possible to solve this equation by hand?

Integrate complex conjugate

Preimage of open pathwise connected set is pathwise connected

Strange Partial Fractions Decomposition

Value of this infinite sum

Splitting short exact sequence of space groups

Show that a certain operator is symmetric

Show that map is conformal

Parametrization of unit sphere in $\mathbb{R}^3$

Facts about the tensor product

Taylor expansion of the electrostatic potential $1/\|\cdot \|$

Prove that for density operators, if $\rho=\sum_i \rho_i P_i$ then $\log\rho=\sum_i P_i\log \rho_i$

$-\varepsilon\log(x)\overset{?}{\geq} -\log(\varepsilon x)$

DFT of binomial coefficients

Statement about density operators, proof feedback

How to prove two trigonometric identities

Powers of a unitary matrix

Compute gradient of this expression more quickly

Commuting self adjoint operators