I forgot my password.
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i wnt to know abt the non-linear problems, and how it's useful in mechanical field
http://en.wikipedia.org/wiki/Nonlinear_system
http://www.google.com/search?q=non-linear+problems&rls=com.microsoft:en-gb:IE-ContextMenu&ie=UTF-8&oe=UTF-8&sourceid=ie7&rlz=1I7RNWN_en