Sorry... so many typos...1. MX Should be KX
2. Substitute X with L, we get a group of linear inequations for t only. (Should be ln(t) = ln1 t + ln2). t is an real variable.
3. Mn(t) will be some function regarding to t but no longer polynomial or linear, like exp(t) + 2sin(t), or t^5 + ln(t)....
I think the examples in 3 can still be treated as linear.
As long as Mn(t) is in the form as show above, it can be treated as linear. The last equation looks hard to solve, but, i guess it is already another problem.
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