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earned this badge 57 times.
Can every finite graph be represented by an arithmetic sequence of natural numbers?
Awarded Feb 23 at 17:17
Commutative diagrams for groups
Awarded Nov 27, 2023 at 4:50
Lindenbaum algebras and models
Awarded Feb 11, 2023 at 15:20
The distance distribution of graphs
Awarded Oct 19, 2022 at 13:26
Predicates of infinite arity
Awarded Sep 25, 2022 at 1:35
Sets = structured sets without structure
Awarded Aug 17, 2022 at 0:57
Some types of diophantine equations and their decidability
Awarded Jun 24, 2022 at 22:19
Characterizations of Euclidean space
Awarded Jun 8, 2022 at 11:05
Prime numbers and limit ordinals
Awarded Aug 14, 2021 at 12:55
Smallest non-isomorphic strongly regular graphs
Awarded Jun 15, 2021 at 23:03
Defining fuzzy properties of crisp graphs
Awarded May 27, 2021 at 15:41
What is the cycle structure of a graph?
Awarded May 24, 2021 at 22:19
Ternary relations that are not binary functions
Awarded Mar 6, 2021 at 16:17
The Stacks project
Awarded Feb 5, 2021 at 15:10
When does an injective group homomorphism have an inverse?
Awarded Feb 16, 2020 at 19:05
Why did Dedekind claim that $\sqrt{2}\cdot\sqrt{3}=\sqrt{6}$ hadn't been proved before?
Awarded Sep 28, 2018 at 0:45
Undecidable graph problems?
Awarded Jun 25, 2018 at 10:52
Complete vertex invariants
Awarded Jun 8, 2018 at 18:54
How many parameters are needed to specify a k-dimensional subspace of R^d?
Awarded Mar 15, 2018 at 9:14
Regular graph colorings
Awarded Feb 2, 2018 at 13:47
Visualizing polyhedra from their 1-skeletons
Awarded Oct 27, 2017 at 12:37
Condition of possibility = Co-Implication
Awarded Jun 7, 2017 at 6:09
Is the collection of isomorphism classes of groups a proper class?
Awarded May 15, 2017 at 19:29
Reconstruction conjecture: Can other decks do the job?
Awarded Dec 4, 2016 at 9:14
Set theories that do require the existence of urelements?
Awarded Sep 22, 2016 at 23:03
Combinatorial distance ≡ Euclidean distance
Awarded Jul 1, 2016 at 22:58
The ABC of categories: ABstract vs Concrete
Awarded Mar 30, 2016 at 3:54
What is "rich structure", actually? [closed]
Awarded Feb 28, 2016 at 18:15
A weaker concept of graph homomorphism
Awarded Nov 22, 2015 at 3:38
Reasons for the importance of planarity and colorability?
Awarded May 10, 2015 at 12:23
Musings in set theory: Reverse sets?
Awarded Apr 4, 2015 at 16:53
Non-constructive proofs of decidability?
Awarded Aug 10, 2014 at 14:16
Relativistic Cellular Automata
Awarded Apr 10, 2014 at 14:58
Gödel's Incompleteness Theorem and the complexity of arithmetic
Awarded Apr 3, 2014 at 9:26
Yet another graph invariant: the similarity matrix
Awarded Mar 21, 2014 at 17:11
Theory mainly concerned with $\lambda$-calculus?
Awarded Mar 15, 2014 at 15:37
Concrete models of abstract structures
Awarded Aug 22, 2013 at 7:06
Can you determine whether a graph is the 1-skeleton of a polytope?
Awarded Jun 5, 2013 at 21:35
Number of permutations with a specified number of fixed points
Awarded Oct 24, 2012 at 9:50
Simple show cases for the Yoneda lemma
Awarded Sep 17, 2012 at 17:19
What is Yoneda's Lemma a generalization of?
Awarded Aug 12, 2012 at 10:20
Category theory and model theory as "natural" counterparts
Awarded Aug 1, 2012 at 7:20
Models of ZFC Set Theory - Getting Started
Awarded May 7, 2012 at 6:35
"Interesting" properties of sets of natural numbers
Awarded May 2, 2012 at 23:20
Isn't a graph to be considered isomorphic to its complement, actually? [closed]
Awarded Apr 24, 2012 at 19:05
Bringing Number and Graph Theory Together: A Conjecture on Prime Numbers
Awarded Mar 12, 2012 at 4:50
Number of trees with n nodes and m leaves
Awarded Jan 22, 2012 at 3:05
Spectral graph theory: Interpretability of eigenvalues and -vectors
Awarded Jan 20, 2012 at 10:35
Infinite groups which contain all finite groups as subgroups
Awarded Jul 5, 2011 at 19:35
Origins of names of algebraic structures
Awarded Jul 3, 2011 at 20:20
Undecidability in Conway's Game of Life
Awarded Jun 23, 2011 at 20:50
Supervenience in mathematics
Awarded Apr 27, 2011 at 15:50
Longest coinciding pair of integer sequences known
Awarded Mar 5, 2011 at 12:35
(post deleted or otherwise unavailable)
Awarded Feb 21, 2011 at 17:05
Quantum mathematics?
Awarded Feb 5, 2011 at 18:05
Kuratowski's definition of ordered pairs
Awarded Feb 3, 2011 at 1:35
Non-standard models of finite set theory
Awarded Jun 5, 2010 at 1:35

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