What is the most intuitive explanation for euler's identity?
742
How to prove Euler's formula: $e^{i\varphi}=\cos(\varphi) +i\sin(\varphi)$?
58188
What's the proof that the Euler totient function is multiplicative?
35571
Euler Rotations in Ordinary Space
107397
Algebraic proof for the identity $\sum_{k=0}^m(-1)^{m-k}{{n \choose {k}}}= {{n-1}\choose m}$
92959
How to show $\gamma$ aka Euler's constant is convergent?
114136
Euler's $\phi(n)$ function and solutions of $\phi(n) = 4294967296=2^{32}$
25729
Why is Euler's Gamma function the "best" extension of the factorial function to the reals?
1970
Inverse Euler totient function
125174
Combinatorial intuition of identity
29531
A Question On Euler's Proof Of the Basel Problem
71534
Combinatorial explanation for why $n^2 = {n \choose 2} + {n+1 \choose 2}$
158515
Identity involving Euler's totient function: $\sum \limits_{k=1}^n \left\lfloor \frac{n}{k} \right\rfloor \varphi(k) = \frac{n(n+1)}{2}$
67172
What's the intuition behind the identities $\cos(z)= \cosh(iz)$ and $\sin(z)=-i\sinh(iz)$?
114074
Intuitive/Visual proof that $(1+2+\cdots+n)^2=1^3+2^3+\cdots+n^3$
51171
Why is Euler's number an uppercase "E" and not a lowercase "e"?
146810
How to derive this binomial identity?
122490
Proof of Parseval's identity