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January 28th, 2017, 03:57 AM  #1 
Newbie Joined: Mar 2016 From: Alabama Posts: 9 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: 787 Thanks: 288 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: 67 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: 787 Thanks: 288 Math Focus: Yet to find out.  

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