How to define natural numbers in terms of real numbers?
68976
Given real numbers: define integers?
141227
How to show the integers have same cardinality as the natural numbers?
113331
Number of ways a natural number can be written as sum of smaller natural number
77957
How is $\mathbb N$ actually defined?
112910
Is the set of real numbers really uncountably infinite?
66272
Is there a common notion of $\mathbb{R}^n$, for non-integer $n$?
130542
Every natural number $n$ can be written as $n=s-t$ with $\omega(s)=\omega(t)$
85186
Basic demonstration concerning the natural logarithm...
108876
Sum of real numbers that multiply to 1
153969
The "elements" of a real number
73881
A question on numerical range
94620
Which number was removed from the first $n$ naturals?
22391
Is the set of all pairs of real numbers uncountable?
110958
How to solve for any given natural number n?
78847
Bijection between Prime numbers and Natural numbers
108922
Cardinality and infinite sets: naturals, integers, rationals, bijections
20135
Measure of  reals in $[0,1]$ which don't have $4$ in decimal expansion