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where p, q are continuous on an open interval I containing t0.
then the linear combination c1y1 + y2c2 is also a solution, for all constants c1 and c2.
and that the Wronskian
is not zero at the point t0 where the initial conditions
are assigned. Then there is a choice of constants c1,c2 for which y = c1y1 + c2 y2 is a solution to the differential equation (1) and initial conditions (2).
If there is a point t0 such that W(y1,y2)(t0) 0, then the family of solutions y = c1y1 + c2 y2 with arbitrary coefficients c1, c2 includes every solution to the differential equation.
and y2 satisfying initial conditions
were fundamental solutions, since W(y1, y2)(t0) = -2 0.
both form fundamental solution sets to the differential equation and initial point
we first find two solutions y1 and y2.