# Math Help - which is the maximal element of the set S={...}

1. ## which is the maximal element of the set S={...}

Hello !

which is the maximal element of the set S={ {1,2},{1,2,3},{3,4},{4,5}} which A<=B <=>$A \subseteq B$,

which is the maximal elements by zorns lemma ?????

2. ## Re: which is the maximal element of the set S={...}

Originally Posted by john27
Hello !

which is the maximal element of the set $S=\{ \{1,2\},\{1,2,3\},\{3,4\},\{4,5\}\}$ which $A\le B \iff A \subseteq B$,

which is the maximal elements by Zorn's lemma ?????

What is the definition of maximal element ?

How would we apply it here?