Welcome! Log In Create A New Profile

week 7 discussion question

Posted by becked

Announcements		Last Post
	SoC Curricula	09/30/2017 01:08PM
	Demarcation or scoping of examinations and assessment	02/13/2017 07:59AM
	School of Computing Short Learning Programmes	11/24/2014 08:37AM
	Unisa contact information	07/28/2011 01:28PM

Forums Messages New

becked

week 7 discussion question
March 12, 2010 07:49AM

Registered: 18 years ago
Posts: 92
Rating: 0

Required to prove:
Xn(YUW) = (XnY) U (XnW)

A person attempts to show that these two sets are equal and provides the following â€˜proofâ€™:
xEXn(YUW)
xEX and xEY or xEW
xE(XnY) U (XnW)
There are many mistakes in this â€˜proofâ€™. Discuss these mistakes.

What is wrong with the notation in the following step in some proof:
iff xE(X and Y) and xE(X and W)