Spec of infinite product of rings is not an infinite disjoint union
35379
Spectrum of infinite product of rings
119545
Nonzero rationals under multiplication are not a cyclic group
45523
Can the product of two non invertible elements in a ring be invertible?
27899
Can we prove the existence of $A\cup B$ without the union axiom?
143586
Is $[0,1]$ a union of family of disjoint closed intervals?
60678
Does 'A countable infinite Cartesian product of countable sets is not necessarily countable' violate induction principle?
54847
Definition of the Infinite Cartesian Product
35855
Closed form for an infinite product
104486
Ideal in $\mathbb Z[x]$ which is not two-generated
16023
Are associates unit multiples in a commutative ring with $1$?
36315
Is $[0,1]$ a countable disjoint union of closed sets?
41783
Cardinality of the Cartesian Product of Two Equinumerous Infinite Sets
147486
Cartesian product of two $\sigma$-algebras is generally not a $\sigma$-algebra?
1751
When does the tensor product distribute over an infinite direct product?
92298
The additive group $\mathbb{G}_a$ over an infinite field $k$ is not a topological group
75970
$\mathbb Z[1/2]$ is not finitely generated?
89523
Infinite product $(1+z)\prod_{n=1}^{+\infty}(1+z^{2^{n}})$