Undergrad Is there a name for this sort of differential equation?

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The differential equation presented, f(z) + 2zf'(z) + f''(z) = 0, does not appear to be classified as a Hermite equation. The suggested general solution involves the probit function, expressed as f(z) = e^{-z^2} (c_1 + c_2 Φ(√3z)). It can be transformed into a Sturm-Liouville form, which is a recognized category of differential equations. This transformation confirms its classification within that framework. The discussion concludes with acknowledgment of the Sturm-Liouville connection.
Gear300
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Is there a name to this sort of differential equation?
$$
f(z) + 2zf'(z) + f''(z) = 0 ~.
$$
I ran into it somewhere and it does not look to be Hermite. I think it has the general solution
$$
f(z) = e^{-z^2} \big( c_1 + c_2 \Phi(\sqrt{3}z) \big)
\quad \textnormal{($\Phi(x)$ is probit function.)}
$$
You might have to correct me on the solution, but is there a name to it?
 
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Gear300 said:
Is there a name to this sort of differential equation?
$$
f(z) + 2zf'(z) + f''(z) = 0 ~.
$$
I ran into it somewhere and it does not look to be Hermite. I think it has the general solution
$$
f(z) = e^{-z^2} \big( c_1 + c_2 \Phi(\sqrt{3}z) \big)
\quad \textnormal{($\Phi(x)$ is probit function.)}
$$
You might have to correct me on the solution, but is there a name to it?
This can be transformed into
##\dfrac{d}{dz} \left ( e^{z^2} \dfrac{df}{dz} \right ) + e^{z^2} f(z) = 0##

This is a Sturm-Louville differential equation.

-Dan
 
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Ah. Thanks.
 
Here is a little puzzle from the book 100 Geometric Games by Pierre Berloquin. The side of a small square is one meter long and the side of a larger square one and a half meters long. One vertex of the large square is at the center of the small square. The side of the large square cuts two sides of the small square into one- third parts and two-thirds parts. What is the area where the squares overlap?

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