Euler's theorem using Lagrange's theorem?
63769
Group theory proof of Euler's theorem ($a^{\phi(m)} \equiv 1\mbox{ }(\mbox{mod }m)$ if $\gcd(a,m)=1$)
156234
Why is the Converse to Lagrange's Theorem False?
99120
Integral representation of Euler's constant
42384
Сanonical form of a quadratic form by Lagrange's method
80670
'Lines' in the Euler phi graph
44595
Derivation of Newton-Euler equations
24966
Converse of Lagrange's theorem for abelian groups
55095
Why can't we separate fraction powers in euler's formula?
145835
Closed form for CRT solution using Euler $\phi\,$ (totient)
81723
Infinitely many primes proof using Euler's totient
105623
Prime factorization knowing n and Euler's function
53426
Proof of a formula involving Euler's totient function: $\varphi (mn) = \varphi (m) \varphi (n) \cdot \frac{d}{\varphi (d)}$
68422
Understanding Lagrange's Theorem (Group Theory)
117171
De-Morgan's theorem for 3 variables?
113840
Does converse of Lagrange's theorem hold for a group of order 21?
119048
What is the Euler Totient of Zero?
8311
Is there another proof for Euler–Mascheroni Constant?