Mathematics

Revival

 Revival
Answer more than 30 days after a question was asked as first answer scoring 2 or more. This badge can be awarded multiple times.

earned this badge 51 times.
How does restriction of scalars interact with tensor products?
Awarded Dec 9, 2023 at 18:45
Constructing the category $\mathbf{Grp}$ from the sets of group structures
Awarded Oct 12, 2023 at 15:56
'Invariants' in a category of modules
Awarded Feb 4, 2023 at 23:41
Functors from rings to groups
Awarded Feb 13, 2022 at 1:27
An example of an equivalence which is not an adjunction
Awarded Apr 24, 2021 at 23:14
Does the box topology have a universal property?
Awarded Jul 23, 2020 at 13:32
Is every commutative ring a limit of noetherian rings?
Awarded Jul 15, 2020 at 14:10
How to name these "ideals"?
Awarded Jul 15, 2020 at 14:10
functoriality of derivations
Awarded Mar 6, 2020 at 13:40
Is there a finite abelian category?
Awarded Feb 23, 2020 at 15:25
A "generalized field" with $q$ elements, when $q$ is any number?
Awarded Aug 17, 2018 at 3:45
Separated prevarieties and schemes
Awarded Nov 25, 2017 at 20:38
example of locally finite type not finite type
Awarded Oct 8, 2017 at 20:19
Presentation of finite rings (fields)
Awarded Nov 5, 2016 at 23:05
Ring homomorphisms which yield same endomorphisms on modules
Awarded Oct 3, 2016 at 10:29
What kind of a thing is the forgetful thing $\mathrm{Hom}_\mathbf{C}(-,X) \rightarrow \mathbf{C}/X$?
Awarded Aug 16, 2016 at 21:35
Initial and Terminal Objects in the category of rigs
Awarded May 25, 2016 at 16:54
Epimorphisms of monoids
Awarded Dec 7, 2015 at 4:53
When is a group ring an integral domain
Awarded Aug 5, 2015 at 15:19
Is category theory constructive?
Awarded Jul 25, 2015 at 16:54
An "identity" functor $f:\mathbf{Rel} \to \mathbf{Rel}^{OP}$
Awarded Jun 16, 2015 at 1:37
What does the group ring $\mathbb{Z}[G]$ of a finite group know about $G$?
Awarded Jun 11, 2015 at 1:48
Grading of the quotient module $M/N$
Awarded Jun 3, 2015 at 12:09
Yoneda lemma for enriched categories
Awarded May 27, 2015 at 22:26
If $G/N$ and $N$ are finitely presented, then $G$ is finitely presented.
Awarded May 26, 2015 at 17:39
What is the difference between a functor that commutes with limits and a functor that preserves limits?
Awarded Apr 19, 2015 at 19:25
$M\times N$ Doesn’t Have a Module Structure
Awarded Apr 11, 2015 at 22:20
The internal hom in $\mathsf{Ch}_\bullet(\mathsf{Ab})$ as a coproduct?
Awarded Apr 11, 2015 at 18:20
Full subcategories of $\mathsf{Grp}$ with epis/monos which are not surjective/injective
Awarded Apr 11, 2015 at 18:20
Fiber product of non-abelian groups.
Awarded Apr 9, 2015 at 5:37
Do hom-sets really live in the category Set?
Awarded Apr 8, 2015 at 15:11
Categorical proof that subgroups of free groups are free?
Awarded Apr 8, 2015 at 8:37
Open coverings and (co)limits
Awarded Apr 8, 2015 at 8:22
small limits in the pointed category of a category with all small limits
Awarded Apr 8, 2015 at 8:22
Examples of colimits in a category of categories
Awarded Apr 7, 2015 at 22:12
How to write $210\in\mathbb Z[\sqrt{-1}]$ as a product of prime elements?
Awarded Dec 3, 2014 at 8:33
Showing that $ϕ(x)=x^n$ is a homomorphism from $G\to Z(G)$
Awarded Nov 29, 2014 at 19:04
A Universal Property Defining Connected Sums
Awarded Jul 29, 2014 at 8:04
Can a free group over a set be constructed this way (without equivalence classes of words)?
Awarded Jul 1, 2014 at 7:08
$0 \rightarrow M' \rightarrow M \rightarrow M'' \rightarrow 0$ exact, $M''$ flat. Why is $M$ flat $\Leftrightarrow M'$ flat?
Awarded May 26, 2014 at 15:21
Reference request: Homomorphism sheaf is quasi-coherent
Awarded May 4, 2014 at 12:47
When does a left adjoint between Heyting algebras preserve 1?
Awarded Jan 24, 2014 at 8:30
Mod-$R$, Mod-$S$ and Mod-$R \otimes S$
Awarded Jan 7, 2014 at 18:10
Is there a suitable definition in categories for a closed continuous function in topology?
Awarded Dec 21, 2013 at 19:48
When is a tensor product of two commutative rings noetherian?
Awarded Jul 14, 2013 at 7:42
Natural Transformation between covariant and contravariant functor
Awarded Apr 17, 2013 at 14:29
When is the sheaf corresponding to a vector bundle on a smooth manifold coherent?
Awarded Feb 20, 2013 at 8:15
On limits, schemes and Spec functor
Awarded Feb 4, 2013 at 22:56
Quasi-coherent sheaves, schemes, and the Gabriel-Rosenberg theorem
Awarded Feb 4, 2013 at 20:26
How to represent the naive PGL functor?
Awarded Oct 25, 2012 at 14:46
epimorphism in the category of commutative rings
Awarded Jul 11, 2012 at 5:06

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