Is there a Poset which has one maximal element but no greatest element?
120951
If a partial order has just one unique maximal element, must that element be a greatest element of x?
27273
Count the number of topological sorts for poset (A|)?
141318
$\subset$ vs $\subseteq$ when *not* referring to strict inclusion
107215
Is $\emptyset \in \emptyset$ or $\emptyset \subseteq \emptyset$?
17991
Nonconstant polynomials do not generate maximal ideals in $\mathbb Z[x]$
100061
The Maximum possible order for an element $S_n$
138273
Terminology for a monoid with a total ordering on the elements?
32754
Each number in a subset $S\subseteq \{1,\ldots,2n\}$ does not divide another one. Then $\max |S|$?
146421
How to prove a total order has a unique minimal element
155799
What would be an example of free module such that cardinality of linearly independent set is greater than the rank?
154230
In $\mathsf{ZF}$, for each set $A$ exists an ordinal $\alpha$ such that no surjection $A\to \alpha$ exists
6307
maximal ideal not containing some expression
114535
what groups have only elements of prime order?
93641
A maximal ideal among those avoiding a multiplicative set is prime
76661
Checking the maximality of a principal ideal in $R[x]$
19924
Uncountable ordinals without power set axiom
146062
A "Cantor-Schroder-Bernstein" theorem for partially-ordered-sets