# New post in Set-theory

## Results in cardinal arithmetic

December 6th, 2022

## What's the point of the axiom of extensionality?

November 27th, 2022

August 1st, 2022

## Is cardinality a total order? Is AC necessary?

August 11th, 2020

## Prove that the Lexicographical Order is Partially Ordered

August 18th, 2020

## Does there exist a set of all cardinals?

February 17th, 2020

July 30th, 2020

March 18th, 2020

## which of the following sets are countable

October 3rd, 2020

## NFA to DFA conversion, half the power set

September 27th, 2020

August 1st, 2022

August 1st, 2022

August 1st, 2022

April 4th, 2020

August 1st, 2022

## Either two sets have the same cardinality, or one has cardinality greater than the other

January 10th, 2020

## If $\alpha$ and $\beta$ are ordinals, prove that $\alpha ^ \beta$ is a countable ordinal.

February 14th, 2020

June 4th, 2020

June 17th, 2020

August 1st, 2022

August 1st, 2022

August 1st, 2022

April 9th, 2020

## Mathematical representation of the largest element in a set

December 20th, 2020

March 6th, 2020

August 1st, 2022

August 1st, 2022

July 17th, 2020

## Russell's shoes and socks

September 20th, 2020

May 13th, 2020