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AyamGorengPedes
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11 votes
2 answers
1k views

Example of a Ring that has nothing to do with numbers

6 votes
2 answers
615 views

How to see that "two manifolds are diffeomorphic when you can give them each a coordinate atlas with the same transition maps"

3 votes
2 answers
63 views

Integration by substitution, but I can't deduce what is happening here

3 votes
1 answer
1k views

Minimum and Maximum as Random Variables

3 votes
3 answers
3k views

What 'complete' means in Hilbert Space

3 votes
0 answers
83 views

Arc-Length of Curves

2 votes
1 answer
256 views

When a graph is only represented as a matrix, what is the chromatic number?

2 votes
1 answer
161 views

Generalization of (vertex) coloring of a graph to hypergraphs

2 votes
0 answers
207 views

Given a vector space $V$, why is the dual space $V^*$ interesting? [duplicate]

2 votes
0 answers
95 views

How is this object in 4D, and why is the convex hull the complete graph?

2 votes
3 answers
174 views

Number of times I need to roll a dice to get two $6$s

2 votes
1 answer
357 views

Questions about Frenet Frames

2 votes
1 answer
49 views

Covariance matrix having lower rank then dimension of the r.v. implies observations lie on a lower dimensional hyperplane, but why?

2 votes
0 answers
33 views

Differentiation of matrices with respect to a structured matrix

2 votes
1 answer
123 views

Possible methods to show that there is (existence or computing) a negative eigenvalue?

2 votes
1 answer
139 views

What is this concept called (differentiating a matrix, NOT talking about Jacobians)

2 votes
1 answer
184 views

Why do we need a function to be defined in a neighbourhood around $a$ so that it's differentiable at $a$?

1 vote
0 answers
37 views

Building the tangent plane

1 vote
0 answers
32 views

Why are we talking about homeomorphisms from these definitions? The question comes from differential geometry.

1 vote
0 answers
43 views

Is it common to use (for example) "Obviously $a \leq b$..." is equivalent to "Let $a \leq b$..."?

1 vote
1 answer
103 views

Is there a two variable polynomial with range $(0,\infty)$? From 'Real Analysis - Miklos Laczkovich and Vera T. Sos'

1 vote
1 answer
86 views

How to understand the proof of 'continuous partial derivatives implies differentiability at $a$'

1 vote
0 answers
108 views

Why is the inverse of a unimodularity matrix integral?

1 vote
0 answers
43 views

Is this weird set in the Borel-$\sigma$-algebra of $\mathbb{R}$?

1 vote
0 answers
31 views

Suppose that $Q$ is an orthogonal matrix and $\bar{Q}$ is the first $j$-columns. Geometrically what is $\bar{Q}\bar{Q}^T$?

1 vote
1 answer
76 views

Is there a quick trick to see $\mathbb{E}[\theta|L=l] = \mathbb{E}_{\Lambda}\left[ \mathbb{E}[\theta|\Lambda, L=l] | L=l \right]$ without expanding? [closed]

1 vote
1 answer
127 views

Algorithm to solve a puzzle

1 vote
0 answers
21 views

Given U(a,b) and V(a,b) as the real and complex part of a complex function f(z), can I find out what is f(z) before being split?

1 vote
1 answer
214 views

Extension of Integrality Lemma for min-max flow

1 vote
1 answer
49 views

Example of non-(normal) and non-($\tau$-normal) hypergraphs?