Is an equilibrium solution always zero in differential equations?

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An equilibrium solution in differential equations is defined as a constant solution where the derivative equals zero. For the differential equation dv/dt = 9.8 - (v/5), the equilibrium solution is v(t) = 49, as it satisfies the condition f(v_0) = 0. This means that at v = 49, the rate of change dv/dt is indeed zero. Therefore, the assertion that equilibrium solutions are always zero is incorrect; they can be any constant value that satisfies the equation.

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I am still in the first few pages of my differential course. I just passed through the term equilibrium solution. Apparently, it meant for me as when the solution of the DE is zero. For example, dv/dt= 9.8-(v/5) ... has an equilibrium solution of 49 where dv.dt is actually zero. Is this the case or not??
 
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ehabmozart said:
I am still in the first few pages of my differential course. I just passed through the term equilibrium solution. Apparently, it meant for me as when the solution of the DE is zero. For example, dv/dt= 9.8-(v/5) ... has an equilibrium solution of 49 where dv.dt is actually zero. Is this the case or not??

An equilibrium solution is a solution which is a constant. Since the derivative of a constant is zero, a constant solution v(t) = v_0 of \dot v(t) = f(v(t)) must satisfy f(v_0) = 0.

Thus any equilibrium solution of \dot v = 9.8 - \frac15 v must satisfy 9.8 - \frac15 v = 0, ie. v(t) = 49.
 

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