How to show this set is not a UFD?
39346
Let $R= \mathbb{Q}[x^2 ,x^3 ]$, the set of all polynomials over $\mathbb{Q}$ with no $x$ term. Show that the $\gcd$ of $x^5$ and $x^6$ does not exist
132382
Showing a set is nowhere dense in $C([0,1])$
133775
Is $\mathbb{Z}[\sqrt{-7}]$ a UFD or not?
128838
Showing a tensor is not a simple tensor
18788
Derangements of multisets
27025
How do I choose an element from a non-empty set?
97373
Is whether a set is closed or not a local property?
27933
Show that unit circle is not homeomorphic to the real line
125043
Show that F(A−B) is not necessarily a subset of F(A)−F(B).
55026
$\mathbb{Q}[X,Y]/(Y^2-X^3)$ is not a UFD
108955
Showing $(\mathbb{Q},+)$ is not isomorphic to $(\mathbb{R},+)$
146055
Proving a set of functions is uncountable
52473
How do you make a square element symbol (\in), to show that an element belongs to a collection of set?
107389
Show that the vector space of real functions is not finitely spanned
13961
An example of a lattice that's not totally ordered
80156
Formatting the union of sets
83907
$f$ bounded but $f'$ isn't