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earned this badge 229 times.
Is PA consistent? do we know it?
Awarded Oct 26, 2014 at 15:05
opposite category
Awarded Jul 20, 2014 at 16:46
What's special about the Simplex category?
Awarded Jun 17, 2014 at 13:17
Grothendieck's Homotopy Hypothesis - Applications and Generalizations
Awarded Jun 15, 2014 at 21:07
What does the 3rd axiom of topologies defined by neighbourhood mean?
Awarded Jun 10, 2014 at 5:17
Self-dual Complete Category
Awarded Jun 9, 2014 at 14:19
Who invented diagrammatic algebra?
Awarded Jun 3, 2014 at 16:04
Non-rigorous reasoning in rigorous mathematics
Awarded May 25, 2014 at 19:44
'Category-theory'-free areas of pure math, 'category-theory'-loaded areas of applied math
Awarded May 7, 2014 at 17:14
Examples of categorification
Awarded May 1, 2014 at 2:56
The most unexpected and/or the least natural category theory theorem?
Awarded Apr 16, 2014 at 21:56
What are your favorite concrete examples of limits or colimits that you would compute during lunch?
Awarded Jan 17, 2014 at 20:49
Commutator of algebraic subgroups is connected
Awarded Jan 15, 2014 at 19:32
Classification of 1-dimensional manifolds (not second-countable)
Awarded Jan 12, 2014 at 8:04
Proof by contradiction in a topos
Awarded Jan 12, 2014 at 8:04
Trimble's theory of operads
Awarded Jan 12, 2014 at 8:04
Basic results with three or more hypotheses
Awarded Jan 12, 2014 at 8:04
Coproducts of complete Boolean algebras
Awarded Jan 12, 2014 at 8:04
Is Euclid dead?
Awarded Dec 20, 2013 at 23:41
Vertical and Horizontal Isomorphisms in 2-categories
Awarded Dec 3, 2013 at 22:09
A Hausdorff abelian group with no character?
Awarded Oct 28, 2013 at 11:51
Does a left coset inclusion in a right coset imply they are equal?
Awarded Oct 20, 2013 at 14:13
Examples of categorification
Awarded Oct 16, 2013 at 7:32
Is there any monoid in which the product of two non-invertible elements could be invertible?
Awarded Sep 26, 2013 at 15:04
Subgroups of finite index of fields
Awarded Jul 29, 2013 at 20:05
An example of a proof that is explanatory but not beautiful? (or vice versa)
Awarded Jul 24, 2013 at 19:21
Why don't ideals and quotients work well for categories?
Awarded Jul 21, 2013 at 13:42
Is $π$ definable in $(\Bbb R,0,1,+,×,<,\exp)$?
Awarded Jul 14, 2013 at 8:39
Is there a monad on Set whose algebras are Tychonoff spaces?
Awarded Jun 29, 2013 at 1:23
Dualizable objects are flat?
Awarded Jun 28, 2013 at 20:16
Question on the interpretation of a presheaf category as a co-completion
Awarded Jun 27, 2013 at 16:47
"A gentleman never chooses a basis."
Awarded May 24, 2013 at 22:35
Why do categorical foundationalists want to escape set theory?
Awarded Apr 29, 2013 at 17:20
Connections between ultrafilters in topology and logic
Awarded Apr 19, 2013 at 20:20
How constructive is Doyle-Conway's 'Division by three'?
Awarded Apr 9, 2013 at 22:05
What are some examples of colorful language in serious mathematics papers?
Awarded Apr 6, 2013 at 4:50
Additive, covariant functor preserve direct sum?
Awarded Mar 26, 2013 at 9:05
Gossip about Grothendieck and distributive lattices
Awarded Mar 19, 2013 at 15:50
What is the name for the composition of a functor with a natural transformation?
Awarded Mar 11, 2013 at 14:35
What if Current Foundations of Mathematics are Inconsistent?
Awarded Mar 1, 2013 at 9:50
How do I explain the number e to a ten year old?
Awarded Feb 13, 2013 at 20:20
(How) should I take notes on a subject for self-study?
Awarded Feb 2, 2013 at 23:35
Fundamental groups of topological groups.
Awarded Jan 27, 2013 at 6:50
Examples of categorification
Awarded Jan 24, 2013 at 18:20
Examples of categorification
Awarded Jan 20, 2013 at 22:20
What's a mathematician to do?
Awarded Jan 19, 2013 at 17:20
How should one think about non-Hausdorff topologies?
Awarded Jan 7, 2013 at 8:05
Do these properties characterize differentiation?
Awarded Dec 29, 2012 at 19:50
Aut(G) = $C_3$, G = ?
Awarded Dec 29, 2012 at 19:05
Examples of sequences whose asymptotics can't be described by elementary functions
Awarded Dec 19, 2012 at 17:05
The category of abelian group objects
Awarded Dec 12, 2012 at 0:05
Functions whose antiderivative behaves like xf(x)
Awarded Nov 30, 2012 at 9:05
Don't the axioms of set theory implicitly assume numbers?
Awarded Nov 29, 2012 at 21:20
Is every saft category cocomplete?
Awarded Nov 29, 2012 at 7:35
Is the non-triviality of the algebraic dual of an infinite-dimensional vector space equivalent to the axiom of choice?
Awarded Nov 25, 2012 at 14:20
Is there a canonical 'composition' of Free Functors?
Awarded Oct 2, 2012 at 15:50
Dimension of infinite product of vector spaces
Awarded Sep 17, 2012 at 17:19
Categorification request
Awarded Sep 6, 2012 at 7:20
Is there a category with a subobject classifier but which is not finitely complete?
Awarded Aug 27, 2012 at 17:20
Ends of topological spaces. Why independent of choice of ascending sequence of compact subsets?
Awarded Aug 17, 2012 at 7:35
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