Uncountably many ordering of natural numbers
3217
Construction of uncountably many non-isomorphic linear (total) orderings of natural numbers
36325
Embedding ordinals in $\mathbb{Q}$
19924
Uncountable ordinals without power set axiom
98518
Cardinality of equivalence relations on N
28942
About Math notation: the set of the first $n$ natural numbers
91485
Finding an uncountable chain of subsets the integers
149277
Does well-ordering of the proper class of cardinal numbers imply choice?
60965
Representing a nonnegative integer as the ordered sum of odd numbers
126569
Can we find a well ordering on an infinite set with no largest element?
109920
Ordered binary sequences of length n with no two consecutive 0's without using recursion
108957
Cardinality of a totally ordered union
4103
Total ordering on complex numbers
52429
Explicit countable elementary extension of $\mathbb{N}$
24091
How many ways can $r$ nonconsecutive integers be chosen from the first $n$ integers?
99599
Uncountable and countable
47592
Integer partitions in all orderings
76521
Every partial order can be extended to a linear ordering