Sufficient conditions for this function being linear
29647
Do there exist functions satisfying $f(x+y)=f(x)+f(y)$ that aren't linear?
146026
What is the norm of this bounded linear functional?
156034
sufficient condition for a polynomial to have roots in $[0,1]$
1954
Entire function bounded by polynomial of degree 3/2 must be linear.
54957
The necessary and sufficient condition for a unit element in Euclidean Domain
75855
Show that $\det{(A + sxy^*)}$ is linear in $s$
149564
Showing that a function is in $L^1$
60306
Natural class of functions whose $\mathcal O$-sets are linearly ordered
66409
Show that the linear operator $(Tf)(x)=\frac{1}{\pi} \int_0^{\infty} \frac{f(y)}{(x+y)} dy$ satisfies $\|T\|\leq 1$.
18967
Linear independence of $\sin(x)$ and $\cos(x)$
76790
Condition to guarantee $f=0$ on $[a,b]$
153238
Simple question on perturbation theory for a function with two small parameters
90435
Prove that there exist linear functionals $L_1, L_2$ on $X$
99105
Are the functions $\sin^n(x)$ linearly independent?
125690
Necessary condition for square integrable functions?
126698
measurability of a function -equivalent conditions
106284
Establishing a Basis for $F[x]/(f(x))$