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Hi Frank, thanks for you Answer! I am not sure if FindRoot is able to do what I want to do. Or I am doing something wrong still, since I am getting cryptic error messages -  it doesnt like the starting point term. I will add the code of the...
Hi Bruce Miller, now it works, thanks a lot! a) & b): You were right, there was a space after the " ` " character. The " ` " is a bit cumbersome to type on the German keyboard, and requires a space, or arrow right afterwards. I did not delete the...