Hello! I would be grateful if you can help me! I have read this problem! Can anyone help me?

Be it that in the u repetition variable xk becomes coming out. Prove that in immediately next repetition (u+1) the same variable, xk, cannot be selected as entering applying the rule of rotation of Dantzig.

I am from Greece actually and maybe my English is not very well. IF you have any questions ask me!

Thank you!

Chris