Does Pi contain itself?
128098
Decimal Expansion of Pi
105973
how do we know the BBP formula for $\pi$ is valid?
44400
$e^{2\pi i x} = (e^{2\pi i})^x$: What happens if x is rational?
76202
Sufficient conditions for being a PID
30519
"Real" cardinality, say, $\aleph_\pi$?
47845
Mirror algorithm for computing $\pi$ and $e$ - does it hint on some connection between them?
130731
Is every integer the sum of distinct prime numbers?
50038
Proving that $e^\pi=e^{-\pi}$
57592
Does existence of $\gcd$ implies PID?
47044
Distribution of the digits of Pi
18380
Proof that Pi is constant (the same for all circles), without using limits
14885
Can we have a Primary Avoidance Theorem ?
111898
Is $\{ (e^{2\pi i a n},e^{2\pi i b n }) : n \in \mathbb{Z} \}$ dense in the torus, where $a,b$ irrationals such that $a/b$ irrational?
126739
Is everything greater than None?
103376
Is $\sin(p \pi/q)$ necessarily an algebraic number?
2786
The staircase paradox, or why $\pi\ne4$
63943
Is $\tan(\pi/2)$ undefined or infinity?