User Gejza Jenča

11 votes

Accepted

Example of non-abelian partially ordered group

answered Apr 8, 2013 at 16:03

9 votes

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Uniquely complemented lattice that is non-modular

answered Dec 17, 2013 at 15:12

8 votes

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Are filters in lattices exactly the homomorphic preimages $\varphi^{-1}(1)$ of top elements?

answered Aug 4, 2013 at 15:22

6 votes

Where can I learn about the lattice of partitions?

answered Jun 13, 2013 at 10:12

6 votes

Accepted

Is every surjective lattice homomorphism a split epimorphism?

answered Jun 8, 2017 at 7:53

5 votes

Existence of maximal boolean-algebra sublattice (preserving top and bottom) of finite distributive lattice

answered Aug 23, 2013 at 19:35

5 votes

Accepted

Does every orthocomplemented lattice satisfy the shuffle laws?

answered Dec 10, 2013 at 23:10

5 votes

Accepted

Is every sub-lattice of $\mathcal P(X)$ isomorphic to a sub-lattice of $\mathcal P(X')$ containing singleton sets?

answered May 19, 2014 at 10:50

5 votes

Example of a bounded lattice that is NOT complete

answered May 18, 2014 at 20:11

5 votes

Accepted

Drawing lattices

answered Mar 28, 2013 at 8:14

3 votes

Help me get hyped about lattices

answered Feb 1, 2013 at 17:14

3 votes

Accepted

Find a lattice with exactly three congruence relations

answered May 14, 2013 at 21:16

3 votes

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Standard notation for the the collection of all minimal elements of the set of all upper bounds?

answered May 17, 2013 at 17:15

3 votes

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Is an orthocomplemented lattice automatically complete?

answered Jun 17, 2013 at 20:35

3 votes

Accepted

Order relation, Hasse diagram and its properties

answered Jun 26, 2013 at 5:11

3 votes

Construct an algebra from its finitely generated algebras

answered Feb 6, 2014 at 21:54

2 votes

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Dense Boolean subalgebras

answered Jun 14, 2014 at 18:55

2 votes

Accepted

necessity of $f(0)=0$ and $f(1)=1$ in homomorphisms of boolean algebras

answered Apr 20, 2016 at 6:57

2 votes

What does distributive property translate into in an non directed graphs?

answered Sep 24, 2016 at 9:28

2 votes

Accepted

Is there any definition of such functions in lattice theory?

answered Jul 16, 2017 at 9:56

2 votes

Accepted

What are “real-world” examples of posets which are not (semi-) lattices?

answered Jan 9, 2019 at 21:39

2 votes

Why are modular lattices important?

answered Oct 27, 2016 at 19:05

2 votes

Is there a name for this kind of "betweenness structure"?

answered Feb 1, 2013 at 10:22

1 vote

Basic introduction to algebraic topology using simplicial complexes

answered Oct 25, 2012 at 20:03

1 vote

Number of join-irreducible elements of a lattice: is it monotonic?

answered May 21, 2014 at 11:11

1 vote

Number of join-irreducible elements of a lattice: is it monotonic?

answered May 21, 2014 at 12:31

1 vote

Accepted

There's an equivalence of simplicial categories $\Delta \to \tilde{\Delta}^{\text{op}}$.

answered Apr 16, 2019 at 20:24

1 vote

Proving the dual and self-dual of a poset.

answered Mar 16, 2014 at 10:54

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28 Answers

Example of non-abelian partially ordered group

Uniquely complemented lattice that is non-modular

Are filters in lattices exactly the homomorphic preimages $\varphi^{-1}(1)$ of top elements?

Where can I learn about the lattice of partitions?

Is every surjective lattice homomorphism a split epimorphism?

Existence of maximal boolean-algebra sublattice (preserving top and bottom) of finite distributive lattice

Does every orthocomplemented lattice satisfy the shuffle laws?

Is every sub-lattice of $\mathcal P(X)$ isomorphic to a sub-lattice of $\mathcal P(X')$ containing singleton sets?

Example of a bounded lattice that is NOT complete

Drawing lattices

Help me get hyped about lattices

Find a lattice with exactly three congruence relations

Standard notation for the the collection of all minimal elements of the set of all upper bounds?

Is an orthocomplemented lattice automatically complete?

Order relation, Hasse diagram and its properties

Construct an algebra from its finitely generated algebras

Dense Boolean subalgebras

necessity of $f(0)=0$ and $f(1)=1$ in homomorphisms of boolean algebras

What does distributive property translate into in an non directed graphs?

Is there any definition of such functions in lattice theory?

What are “real-world” examples of posets which are not (semi-) lattices?

Why are modular lattices important?

Is there a name for this kind of "betweenness structure"?

Basic introduction to algebraic topology using simplicial complexes

Number of join-irreducible elements of a lattice: is it monotonic?

Number of join-irreducible elements of a lattice: is it monotonic?

There's an equivalence of simplicial categories $\Delta \to \tilde{\Delta}^{\text{op}}$.

Proving the dual and self-dual of a poset.