Relation R in the set A of human beings in a town at a particular time given by R = {(x, y) : x is wife of y}. Determine if reflexive, symmetric and transitive.

Asked by  | 27th Mar, 2012, 10:14: PM

Expert Answer:

R = {(x, y): x is the wife of y}
Now,
(x, x) ? R
Since x cannot be the wife of herself.
?R is not reflexive.

Now, let (x, y) ? R
? x is the wife of y.
Clearly y is not the wife of x.
?(y, x) ? R
If x is the wife of y, then y is the husband of x.
? R is not transitive.
 
Let (x, y), (y, z) ? R
? x is the wife of y and y is the wife of z.
This case is not possible. Also, this does not imply that x is the wife of z.
?(x, z) ? R
?R is not transitive.

Hence, R is neither reflexive, nor symmetric, nor transitive.

Answered by  | 28th Mar, 2012, 09:55: AM

Queries asked on Sunday & after 7pm from Monday to Saturday will be answered after 12pm the next working day.