User AmagicalFishy

22 votes

2 answers

26k views

Why is this allowed? ("Fourier's Trick"; finding the coefficients in a Fourier Series)

asked Mar 9, 2014 at 9:08

10 votes

2 answers

6k views

Describe all ring homomorphisms from $\mathbb Z\times\mathbb Z$ to $\mathbb Z\times\mathbb Z$

asked Mar 5, 2014 at 19:55

9 votes

3 answers

3k views

What is contracting a tensor actually doing?

asked Sep 26, 2014 at 19:16

7 votes

3 answers

144 views

What does one study to increase understanding of the $P \stackrel{?}{=} NP$ problem?

asked Dec 25, 2014 at 15:56

5 votes

4 answers

1k views

What does a binomial coefficient with commas mean?

asked Jun 6, 2017 at 20:46

4 votes

4 answers

299 views

Does whether or not we assume the Axiom of Choice change the definition of a set?

asked Jul 23, 2017 at 11:43

4 votes

1 answer

985 views

Finding the conjugates in $\mathbb{C}$ of a given number over a given field...

asked May 2, 2014 at 1:14

4 votes

2 answers

642 views

Why is this proof incorrect? - $f(b) - f(a) = [Df(c)](b-a) = \nabla f(c) \cdot (b-a)$

asked Mar 10, 2014 at 22:14

3 votes

3 answers

3k views

The characteristic of a subdomain is the same as the integral domain in which it is contained?

asked Feb 7, 2014 at 7:46

3 votes

1 answer

9k views

The Derivative of a General Linear Map

asked Feb 19, 2014 at 1:48

3 votes

1 answer

1k views

If $f_j$ converges uniformly to $f$, does $\frac{1}{f_j}$ converge uniformly to $\frac{1}{f}$?

asked Feb 5, 2015 at 9:55

3 votes

3 answers

480 views

Mathematical Math History books?

asked Sep 20, 2017 at 3:30

2 votes

0 answers

305 views

What things would I have to learn to understand the Birch and Swinnerton-Dyer Conjecture?

asked Nov 9, 2017 at 18:53

2 votes

0 answers

76 views

These terms are so foreign to me that they feel like unnecessary jargon; what do these terms mean, and are they relatively common?

asked Jan 16, 2019 at 21:14

2 votes

2 answers

71 views

How could I build a "derivative-like" object defined w/ circles (instead of secant/tangent lines) that reduces to the usual derivative?

asked Jul 25, 2019 at 19:19

2 votes

1 answer

121 views

An zero upper-sum on a function with a discontinuous function

asked Nov 13, 2014 at 4:13

2 votes

0 answers

185 views

Proof that Continuity Implies $\epsilon$-$\delta$ Criterion

asked Nov 18, 2014 at 1:17

2 votes

1 answer

349 views

Finding the parallel transport of $S^2$ with constant zenith angle

asked Mar 5, 2015 at 4:57

2 votes

1 answer

889 views

What is a simple way of describing branch cuts?

asked Mar 11, 2015 at 4:25

2 votes

1 answer

240 views

What am I working with? [Inferring a theory in Category Theory using associativity of Cartesian Product]

asked Jul 24, 2015 at 13:10

2 votes

2 answers

484 views

Why doesn't this work? -- The V.I. Arnold Primary School Problem (Two women started at sunrise...)

asked Feb 23, 2014 at 22:12

2 votes

2 answers

7k views

Constructing a Cone and its Normal Vectors in Spherical Coordinates

asked May 23, 2014 at 19:46

2 votes

1 answer

226 views

Simple proof that this sequence converges [verification]

asked Sep 22, 2014 at 12:08

1 vote

1 answer

403 views

Setting Up an Integral (depends on displacement vector from a long line)

asked Aug 13, 2014 at 1:55

1 vote

1 answer

853 views

The Galois Group of $x^4 - 5x^2 + 6$ [duplicate]

asked May 2, 2014 at 7:09

1 vote

0 answers

65 views

Calculating Flux with Gauss's Theorem

asked May 6, 2014 at 6:51

1 vote

1 answer

739 views

Is this proof circular? (Proof that the open disk/ball of radius 'r' is an open set)

asked Feb 17, 2014 at 1:18

1 vote

2 answers

40 views

Notation Question regarding Ring-mod-Number and Ring-mod-Some Kernel

asked Mar 11, 2014 at 21:08

1 vote

1 answer

97 views

$f(x) \mid g(x) \iff g(x) \in \langle f(x) \rangle$. Isn't this trivial?

asked Mar 13, 2014 at 9:11

1 vote

1 answer

2k views

Integration w/ Change of Variables

asked Apr 6, 2014 at 1:02

Stack Exchange Network

58 Questions

Why is this allowed? ("Fourier's Trick"; finding the coefficients in a Fourier Series)

Describe all ring homomorphisms from $\mathbb Z\times\mathbb Z$ to $\mathbb Z\times\mathbb Z$

What is contracting a tensor actually doing?

What does one study to increase understanding of the $P \stackrel{?}{=} NP$ problem?

What does a binomial coefficient with commas mean?

Does whether or not we assume the Axiom of Choice change the definition of a set?

Finding the conjugates in $\mathbb{C}$ of a given number over a given field...

Why is this proof incorrect? - $f(b) - f(a) = [Df(c)](b-a) = \nabla f(c) \cdot (b-a)$

The characteristic of a subdomain is the same as the integral domain in which it is contained?

The Derivative of a General Linear Map

If $f_j$ converges uniformly to $f$, does $\frac{1}{f_j}$ converge uniformly to $\frac{1}{f}$?

Mathematical Math History books?

What things would I have to learn to understand the Birch and Swinnerton-Dyer Conjecture?

These terms are so foreign to me that they feel like unnecessary jargon; what do these terms mean, and are they relatively common?

How could I build a "derivative-like" object defined w/ circles (instead of secant/tangent lines) that reduces to the usual derivative?

An zero upper-sum on a function with a discontinuous function

Proof that Continuity Implies $\epsilon$-$\delta$ Criterion

Finding the parallel transport of $S^2$ with constant zenith angle

What is a simple way of describing branch cuts?

What am I working with? [Inferring a theory in Category Theory using associativity of Cartesian Product]

Why doesn't this work? -- The V.I. Arnold Primary School Problem (Two women started at sunrise...)

Constructing a Cone and its Normal Vectors in Spherical Coordinates

Simple proof that this sequence converges [verification]

Setting Up an Integral (depends on displacement vector from a long line)

The Galois Group of $x^4 - 5x^2 + 6$ [duplicate]

Calculating Flux with Gauss's Theorem

Is this proof circular? (Proof that the open disk/ball of radius 'r' is an open set)

Notation Question regarding Ring-mod-Number and Ring-mod-Some Kernel

$f(x) \mid g(x) \iff g(x) \in \langle f(x) \rangle$. Isn't this trivial?

Integration w/ Change of Variables