Could you please help with this?

Let be a non-empty partially ordered set and assume that no element of is maximal. Use the Axiom of Choice to show that there exists a function such that

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- Mar 8th 2010, 01:20 PMMimi89Partially ordered set with no maximal element
Could you please help with this?

Let be a non-empty partially ordered set and assume that no element of is maximal. Use the Axiom of Choice to show that there exists a function such that - Mar 8th 2010, 01:34 PMarsenicbear
Here's my idea. We're going to construct a relation that you can apply Axiom of Choice to for obtaining the function you desire.

Pick some arbitrary

Construct a set of ordered pairs R s.t. it has two properties.

(1)

(2) if for some and <x^{+}, y'> s.t. y P_{r} y'

You know that there will always exist greater y's because P has no maximal unit.

Then from axiom of choice you can create a function from this relation and I believe it should have all the properties you want. - Mar 9th 2010, 12:52 AMMimi89
Thank you a lot for your help; could you please just edit the equations, as they're given as "Latex Error: Syntax Error"'s now?

Thank a lot,

Mimi - Mar 9th 2010, 01:37 AMarsenicbear
I've edited my eqns. Also P_{r} represents the partial order relationship that is assumed in P.