It is smoothness with which we are specifically concerned.
Specifically, choose A=B=id/dx.
Specifically, one might hope that a clever application of something like Choquet's theorem would yield the desired conclusion.
Go to List of words starting with:
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
Y
Z