
Computer Science Computer Science Forum 
 LinkBack  Thread Tools  Display Modes 
January 28th, 2017, 03:57 AM  #1 
Newbie Joined: Mar 2016 From: Alabama Posts: 18 Thanks: 0  Another Boolean question WolframAlpha: Computational Knowledge Engine WolframAlpha: Computational Knowledge Engine Why is the first link a tautology and the second not? Why is bringing "(XY)&&(X nand Y)" to the front a mistake? (Edit: The forum software automatically put the end url markers at the wrong place. It was confused by all the parentheses.) Last edited by zambod; January 28th, 2017 at 04:01 AM. 
January 29th, 2017, 04:45 AM  #2 
Senior Member Joined: Feb 2016 From: Australia Posts: 1,518 Thanks: 506 Math Focus: Yet to find out. 
Why wouldn't it be? But have you double checked your brackets?

February 3rd, 2017, 10:58 AM  #3 
Member Joined: Feb 2014 Posts: 91 Thanks: 1 
A tautology happens when all conditions are true no matter what. Using a truth table you will be able to figure this out.

February 3rd, 2017, 06:43 PM  #4 
Senior Member Joined: Feb 2016 From: Australia Posts: 1,518 Thanks: 506 Math Focus: Yet to find out.  

Tags 
boolean, question 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Boolean algebra simplification using boolean rules  JustForFun2000  Computer Science  2  September 26th, 2016 10:11 AM 
Boolean Algebra basics question  topsquark  Abstract Algebra  5  September 12th, 2014 04:48 PM 
Boolean Algebra  sailorman444  Algebra  1  January 9th, 2014 08:21 AM 
Another boolean question  Airmax  Applied Math  2  March 3rd, 2008 08:01 PM 
Basic Boolean Question  Airmax  Applied Math  2  February 24th, 2008 10:47 PM 