Hello ppl :-)

A={3,5,9,15,24,45} . Also R={(x,y) | x divides y} . Proove that

1) R is partial ordered

2) Hasse diagramm for R

3) Upper bounds of {3,5} , Lower bounds for {15,45}

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for 1) i have to show that R is reflexive, antisymmetric, and transitive

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

2) xy

/ \

x y

\ /

0

3) No idea =/