Another way we could write it, if we said that y is a function of x, we could write this in function notation. We could write the second derivative of our function with respect to x plus two times the first derivative of our function is equal to three times our function. Or if we wanted to use the Leibniz notation, we could also write, we could also write the second derivative of y with respect to x plus two times the first derivative of y with respect to x is equal to three times y. All three of these, I guess, equations are really representing the same thing. They're saying, okay, can I find functions where the second derivative of the function plus two times the first derivative of the function is equal to three times the function itself? So just to be clear, these are all essentially saying the same thing. And you might have just caught from how I described it that the solution to a differential equation is a function or a class of functions.