Is there a theorem that tells us that $\widehat{f\circ g}=\hat f(\hat g)$?
136996
Fourier transform of function composition
91085
how to find $|GL_2(F_p)|$
24478
What is the name of this theorem, and are there any caveats?
52012
Is there exist a homemoorphism between either pair of $(0,1),(0,1],[0,1]$
148981
Entire $f$ and $g$ constant if $e^{f(z)}+e^{g(z)}=1$
104848
What's the name of this theorem ($f>g$ given $f'>g'$ and initial value)?
98474
Show the existence of a certain subgroup of F2
92033
Prove that $g$ is a submanifold: $g (t,u,v) = (t^2,u^2,v^2,\sqrt{2}uv, \sqrt{2}tv,\sqrt{2}tu)$
55492
Existence of $f'\in F$ such that $f^{[G:F]}=(f')^n$ for finite extension $F\subset G$
106927
How do I prove $[G:H\cap K]\leq [G:H][G:K]$?
152451
REVISITED $^2$: Does a solution in $\mathbb{R}^n$ imply a solution in $\mathbb{Q}^n$?
99630
For every $g\in G$ there exists an $h\in G$ such that $g = h^3$
40383
Is it true that $|g| = |\phi(g)|$ for all homomorphisms $\phi: G \to G$ and $g \in G$?
55232
Show that $g\circ f\equiv 0$ implies $\det Df\equiv 0$, where $g(x_1,...,x_n)=x_1^5+...+x_n^5$
70912
If $g\circ f$ is injective and $f$ is surjective then $g$ is injective
90537
Converse of Fermat's Little Theorem.
124844
Show that $\phi \circ f$ belongs to $L_p$ for each $f \in L_p$