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3 votes
1 answer
2k views

homeomorphism from $\mathbb{R}^2 $ to open unit disk.

2 votes
1 answer
2k views

Explicit Homeomorphism from $\mathbb{R}^2$ to open disk

2 votes
1 answer
1k views

Difference between volume/measure zero and not having volume

2 votes
1 answer
2k views

Fourier Series of a sum of two functions [closed]

2 votes
1 answer
59 views

From Dividing open bounded sets in $\mathbb{R}^2$ into equal areas, what goes wrong if $U,V$ not connected?

2 votes
1 answer
343 views

Atomic domain that doesn't satisfy ACCP [duplicate]

1 vote
2 answers
308 views

What is the quotient group o mod the identity

1 vote
1 answer
53 views

$x\cos(x)=-\frac{1}{2} \sin(x) + 2\sum_{n=2}^{\infty} \frac{(-1)^n n \sin(nx)}{n^2-1}$ for $x\in (-\pi,\pi)$

1 vote
1 answer
350 views

Antipodal gluing of a disk is homeomorphic to a disk.

1 vote
1 answer
667 views

Annulus Homotopic to punctured plane

1 vote
1 answer
99 views

Constrained Optimization

0 votes
0 answers
69 views

Probability of x modulus a prime = a

0 votes
0 answers
281 views

Two self maps $f,g:S^n\to S^n$ are homotopic if there is no $x\in S^n$ with $f(x)=-g(x)$

0 votes
1 answer
610 views

Showing $\mathbb{R}^3$ minus $n$ parallel lines is homotopic to $\mathbb{R}^2\setminus\{p_1,\dots,p_n\}$

0 votes
2 answers
659 views

$f$ is null homotopy if and only if $f_*$ is the trivial induced homomorphism

0 votes
0 answers
148 views

Coordinate ring of a variety Miles Reid Undergraduate Commutative Algebra: [6.9]

0 votes
1 answer
58 views

Estimating for non negative r.v. $P[X>0]$

-1 votes
1 answer
38 views

Finiteness of solutions to polynomial equations.