0 as an element of the natural numbers
33705
Is $0$ a natural number?
108748
Why there are real numbers with infinite digits, but no such natural numbers (or another reason why real numbers are uncountable)
156660
The set of all strictly increasing sequences of natural numbers
149716
Prove that $ \sqrt{n(n+1)(n+2)(n+3)+1} $ is always a natural number
116970
On the number divisors of a number
141298
Image of the set of natural numbers under any function is denumerable.
70266
1-1 correspondence between [0,1] and [0,1)
80547
If $0$ is the zero-object $ \Longrightarrow F(0) $ is the zero object when $F$ additive
21782
Is $\aleph_0 = \mathbb{N}$?
33792
Numbers to the Power of Zero
124890
Divisibility within a block of natural numbers
156242
As many even numbers as natural numbers.
55373
The difference between 0. and 0
78294
How does one denote the set of  all positive real numbers?
51928
Use an induction argument to prove that for any natural number $n$, the interval $(n,n+1)$ does not contain any natural number.
69228
Factorial of 0 - a convenience?
113331
Number of ways a natural number can be written as sum of smaller natural number