I have a silly question.
k = 0.15; kf = 0.03; Mod[k, kf]
is giving me
0 as it should but when I change
k = 0.15; kf = 0.05; Mod[k, kf]
it is giving me
0.05 when it should also be zero.
In short: while does Mathematica think that
Mod[0.15, 0.05] = 0.05?