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Mathematics
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Nash's user avatar
Nash's user avatar
Nash
  • Member for 7 years, 8 months
  • Last seen more than a month ago
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7
Let $X=\mathbb{D}^2/\sim$, where $(\cos(\theta),\sin(\theta))\sim(\cos(\theta+\frac{2\pi}{3}),\sin(\theta+\frac{2\pi}{3}))$, $\theta\in \mathbb{R}$
Jun 24, 2019
5
The succession of the coefficient theorem is split but not naturally
Aug 20, 2019
4
Suppose that $q: X\to Z$ and that $p: X\to Y$ are covering spaces. Suppose there is a continuous function $r: Y\to Z$ such that $r\circ p=q$.
Apr 8, 2018
4
Find the universal covering of $\mathbb{R}P^2\vee\mathbb{R}P^2$
Apr 30, 2018
4
Using taylor series expansion to approximate the derivative of a function
May 21, 2018
4
Show that the ring of polynomials with coefficients in a field, and in infinitely many variables, is not Noetherian
Aug 21, 2018
4
Show that if $\{a_1, ... ,a_n\}$ is a $p$-basis for $K/F$, then $[K: F] = p^n$.
Nov 10, 2017
4
Show the quotient space of a finite collection of disjoint 2 simplices obtained by identifying pairs of edges is always a surface, locally homeomorp
Jul 13, 2019
4
$f_n:C_n\to D_n$ is injective for all $n\in\mathbb{Z}$ but $f_*:H_n(C_*)\to H_n(D_*)$ is not injective for some $n\in \mathbb{Z}$.
May 16, 2019
4
$\mathbb{C}$ is isomorphic to $\bar{\mathbb{Q}}$?
Sep 21, 2017