Find answers to your questions about MathOverflow or help others by answering their MathOverflow questions.
Any homology sphere is stably parallelizable, hence nullcobordant. However, rational homology spheres need not be nullcobordant, as the example of the Wu manifold shows, which generates $text{torsion}({Omega^{text{SO}}_{5}}) cong...
Asked on 11/03/2021 by Jens Reinhold
2 answerQuestion 1: Is there a polygon $P$ thatcannot tile the planeandtiles the plane when copies of $P$ and some other polygon(s) all similar in shape to ...
Asked on 11/03/2021 by Nandakumar R
6 answerThis question on math.stackexchange.com has 35 views, three up-votes, and not a word from anybody, so I'm posting it here. Let us understand the term polynomial sequence to mean...
Asked on 11/03/2021
1 answerI think a related question might be this (Set-Theoretic Issues/Categories). There are many ways in which you can avoid set theoretical paradoxes in dealing with category theory (see for...
Asked on 11/03/2021 by jg1896
4 answerAll rings considered will be commutative and unitary. Let $A$ be a ring, $S subseteq A$ a multiplicatively closed subset. The localization $lambda_S : A longrightarrow A[S^{-1}]$...
Asked on 11/03/2021 by MathCrawler
2 answerI'm reading Mumfords's Lectures on Curves on an Algebraic Surface (jstor-link: https://www.jstor.org/stable/j.ctt1b9x2g3)and I found in Lecture 7 (RESUME OF THE COHOMOLOGY OF COHERENT SHEAVES ON...
Asked on 11/03/2021
1 answerLet $Sigma_g$ be a Riemannian surface of genus $g$. Let $M^4$ be a surface bundle over surface: $Sigma_g to M^4 to Sigma_h$. $Sigma_g$ is the...
Asked on 11/03/2021
1 answerGiven a number $N$, the number of ways to write it as a sum of powers of $2$ is called the binary partition function of $N$ and...
Asked on 11/03/2021 by Rishi Gajjala
0 answerLet $cge2$ be a fixed positive integer. How many nontrivial solutions in the integers does the equation $(a^c-b^c)+3(r^c-s^c)=0$ have? If $c=2$, I think it has infinitely...
Asked on 11/03/2021
2 answerI'd like to understand the structure of the functor category Coh whose objects are cohomology functors from a category of Spaces to the category of graded commutative rings GCR. Spaces...
Asked on 11/03/2021
2 answerGet help from others!
Recent Answers
Recent Questions
© 2024 TransWikia.com. All rights reserved. Sites we Love: PCI Database, UKBizDB, Menu Kuliner, Sharing RPP