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Order-theory
New post in Order-theory
Are there any "crazy" totally ordered rings without infinities/infinitesimals?
August 1st, 2022
ordered-rings
ring-theory
order-theory
What is the order-type of the set of natural numbers, when written in alphabetical order?
August 1st, 2022
logic
elementary-set-theory
elementary-number-theory
puzzle
order-theory
what is total order - explanation please
August 1st, 2022
order-theory
definition
elementary-set-theory
Properties of the cone of positive semidefinite matrices
August 1st, 2022
matrices
vector-lattices
positive-semidefinite
lattice-orders
order-theory
Order preserving bijection from $\mathbb Q\times \mathbb Q$ to $\mathbb Q$
August 1st, 2022
order-theory
rational-numbers
Does Birkhoff - von Neumann imply any of the fundamental theorems in combinatorics?
August 1st, 2022
birkhoff-polytopes
order-theory
graph-theory
combinatorics
Simplest Example of a Poset that is not a Lattice
August 1st, 2022
examples-counterexamples
lattice-orders
elementary-set-theory
order-theory
What is the difference between max and sup?
August 1st, 2022
order-theory
dynamical-systems
What do linearly ordered abelian groups look like?
August 1st, 2022
group-theory
order-theory
Isn't every totally ordered set well-ordered?
August 1st, 2022
order-theory
Are irrational numbers order-isomorphic to real transcendental numbers?
February 7th, 2020
order-theory
algebraic-number-theory
What does "curly (curved) less than" sign $\succcurlyeq$ mean?
September 1st, 2021
optimization
order-theory
difference between maximal element and greatest element
August 1st, 2022
elementary-set-theory
order-theory
A finite set always has a maximum and a minimum.
September 4th, 2021
order-theory
real-analysis
elementary-set-theory
Infimum and supremum of the empty set
October 1st, 2020
real-analysis
order-theory
How to find a total order with constrained comparisons
August 1st, 2022
combinatorics
order-theory
Example of Partial Order that's not a Total Order and why?
April 3rd, 2020
order-theory
examples-counterexamples
elementary-set-theory
Is there a known well ordering of the reals?
February 28th, 2020
well-orders
set-theory
axiom-of-choice
order-theory
Every partial order can be extended to a linear ordering
October 28th, 2021
elementary-set-theory
reference-request
order-theory
Embedding ordinals in $\mathbb{Q}$
November 29th, 2020
order-theory
ordinals
Divisibility Relation On the Set $S = \{ 2, 6, 7, 14, 15, 30, 70, 105, 210 \}$: Hasse Diagram, Maximal, Minimal Elements, Greatest, Least elements
August 1st, 2022
relations
divisibility
order-theory
Proof that the sum of the order of the orbits of a set is = the order of the set?
August 1st, 2022
order-theory
group-theory
Prove that $\sup(A+B) = \sup(A) + \sup(B)$ and why does $\sup(A+B)$ exist?
September 16th, 2020
solution-verification
proof-writing
real-analysis
alternative-proof
order-theory
What is $\inf\emptyset$ and $\sup\emptyset$?
August 1st, 2022
analysis
order-theory
supremum-and-infimum
The difference between well order and total order?
April 28th, 2020
order-theory
well-orders
When is a join semilattice not a meet semilattice?
July 11th, 2020
order-theory
lattice-orders
If a finite poset has greatest and least elements, is it a lattice?
April 7th, 2020
definition
lattice-orders
order-theory
Why does every countable limit ordinal have cofinality $\omega$?
August 1st, 2022
set-theory
ordinals
order-theory
Getting a Distributive-Lattice from Poset or, equivalently, a Greedoid from a Poset
March 20th, 2020
order-theory
lattice-orders
"Any finite poset has a maximal element." How to formalize the proof that is given?
August 1st, 2022
order-theory
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