To User: Frau Holle

I noticed that you split the long introduction of the Nonlinear programming page into several sub-sections, like Mathematical formulation of the problem and Methods for solving the problem, etc. But, some text which should have clearly been in 
Methods for solving the problem you left in the Mathematical formulation of the problem. I fixed that. Please let me know if you think I am wrong about the change. Thanks.

User: Olegalexandrov