Hello,
Thank you for your answer. But in fact, this ".1d" showed up only when I coped and pasted here. In the mathematica file, I dont see it, thats why I say it is an invisible parameter. See the PFD I attached to the first post, mathematica graphs the number, as if there was some parameter, although I can't see it.
So on my file when I click on plot I see something like:
Manipulate[ Plot[ 1/2 (-1 + k)^ L k^(-2 L) , {k, 1, 20}], {, 1,20}, {L, -2, 2}, {V, -2, 2}]
I don't know why this {, 1,20} shows up, and if I remove it the graph doesn't display.