
Math General Math Forum  For general math related discussion and news 
 LinkBack  Thread Tools  Display Modes 
March 15th, 2017, 06:10 PM  #1 
Newbie Joined: Mar 2017 From: canada Posts: 1 Thanks: 0  Sets (cardinality)
What is meant by odd and even cardinality in set theory. What are formulas to use them?
Last edited by skipjack; August 7th, 2017 at 10:23 PM. 
August 7th, 2017, 10:24 PM  #2 
Global Moderator Joined: Dec 2006 Posts: 18,704 Thanks: 1529 
Do you still need help with this?

August 8th, 2017, 04:29 PM  #3 
Global Moderator Joined: May 2007 Posts: 6,454 Thanks: 567 
I presume the terms refer only to sets with finite number of elements.

September 1st, 2017, 08:42 AM  #4 
Math Team Joined: Jan 2015 From: Alabama Posts: 2,966 Thanks: 807 
For finite sets, the "cardinality" is just the number of elements in the set. A set has even cardinality if it contains an even number of elements and has odd cardinality if it contains an odd number of elements. {a, b, c} has three elements so has odd cardinality. {a, b, c, d} has four elements so has even cardinality.


Tags 
cardinality, sets 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Cardinality of generated sets  Ezio  Abstract Algebra  0  September 4th, 2015 02:06 AM 
Open Sets and Closed Sets  fienefie  Real Analysis  6  February 24th, 2015 02:14 PM 
Cardinality of integers equals cardinality of reals  BenFRayfield  Number Theory  0  February 15th, 2014 02:55 PM 
What is the cardinality of each of the following sets?  Phatossi  Real Analysis  2  November 4th, 2012 09:14 PM 
Cardinality, Sets, in one triple Question.  Aeonitis  Applied Math  4  August 4th, 2010 07:32 AM 