Is Euler's formula if-and-only-if?
49044
Question about Eulers formula $v - e + f = 2$
53426
Proof of a formula involving Euler's totient function: $\varphi (mn) = \varphi (m) \varphi (n) \cdot \frac{d}{\varphi (d)}$
25710
$A ⊂ B$ if and only if $A − B = ∅$
119359
Excel "if-then" formula
83421
Checking if a number is a Fibonacci or not?
125734
Has anyone talked themselves into understanding Euler's identity a bit?
52353
Bounding Euler's e by showing $2 \leq \left (1+ \frac{1}{n}\right)^n < 3$
6396
If two limits don't exist, are we sure the limit of sum doesn't exist?
17690
Ways to prove Euler's formula for $\zeta(2n)$
106120
Mathematica Improved Euler's Method
100926
Incoherence using Euler's formula
77070
Prove Euler's Theorem when the integers are not relatively prime
63952
Disproving: If $(\Gamma\vdash(\phi\,\lor\psi))$, either $(\Gamma\vdash\phi)$ or $(\Gamma\vdash\psi)$ is true
106092
Can mathematical definitions of the form "P if Q" be interpreted as "P if and only if Q"?
22821
May $y=e^x$ be satisfied with both $x$ and $y$ $\in$ $\mathbb{Z}^+$?
137494
Why is "If ψ ∈ Γ then the sequent (Γ ⊢ ψ) is correct" true?
42355
Double check $G\sim H$ iff $G≈H$