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philipp, The NMinimize:ivar warning appears to say that k (kappa) has a value and should not be used as an independent variable in NMinimize. Both: attaching a notebook file with your code would make it easier for others to try to help.
Jim, Suggestions can be sent via http://www.wolfram.com/support/contact/email/?topic=Technical A simple code example with actual output and preferred output would help clarify the issue.
Just to be sure the installation went ok: Can you see the math and mathematica scripts in /usr/local/bin (or the location you told it to put the scripts in) ? Can you start them in a terminal window?
Similar work in http://community.wolfram.com/groups/-/m/t/223067
Mr. Keith, Please feel free to send that suggestion via http://www.wolfram.com/support/contact/email/ or support@wolfram.com. The clearer the description, the better.
If you want 2-dimensional typesetting in input, go ahead. Some people find "^" a little quicker.
Is this about CDF Plug-in, Wolfram|Alpha, Cloud-deployed app, or something else?
"rk ist dieUnbekannte" ~ rk is the unknown Google Translate did not know steitig and diffbar.
A beginner's guide to subscripted variables is attached. The question of commas in subscripts was treated last year in http://community.wolfram.com/groups/-/m/t/306808 .
duplicate of http://community.wolfram.com/groups/-/m/t/436171