Start by writing the definition: what it means for R to be reflexive. Substitute the definition of R into that expression.for 1) i have to show that R is reflexive, antisymmetric, and transitive

not sure how to show it for this particular problem though.

A Hasse diagram is a graph where vertices are elements of the partially ordered set, i.e., A. Zero is not a member of A and neither are x and y.2) xy

/ \

x y

\ /

0

Again, write the definition, what it means for a number x to be an upper bound of 3 and 5 and substitute the definition of R there.3) Upper bounds of {3,5} , Lower bounds for {15,45}