where the right-hand side may depend on t.
for a well-defined system to arise, we need the solutions of this equation for arbitrary initial conditions and measurable locally essentially bounded controls to exist at least for small times.
weaker regularity hypotheses can be made, but as far as x and u are concerned, we shall settle essentially on continuity on both x and u and differentiability on x.
this still leaves to be settled the issue of what regularity must be assumed in t, when dealing with time-vary systems.
in order to decide what is reasonable in the regard, consider one of the main ways in which time-varying systems arise.
typically, there is a trajectory Q that has been given for the above equation, and one wants to compare Q with a trajectory Q cooresponding to a different control.
in other words, one is interested in the dynamics of the deviations Q from Q.
note that, omitting the "t" arguments where clear, Q where Q.
where the right-hand side may depend on t.for a well-defined system to arise, we need the solutions of this equation for arbitrary initial conditions and measurable locally essentially bounded controls to exist at least for small times.weaker regularity hypotheses can be made, but as far as x and u are concerned, we shall settle essentially on continuity on both x and u and differentiability on x.this still leaves to be settled the issue of what regularity must be assumed in t, when dealing with time-vary systems.in order to decide what is reasonable in the regard, consider one of the main ways in which time-varying systems arise.typically, there is a trajectory Q that has been given for the above equation, and one wants to compare Q with a trajectory Q cooresponding to a different control.in other words, one is interested in the dynamics of the deviations Q from Q.note that, omitting the "t" arguments where clear, Q where Q.
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