What do indices in brackets mean? [closed]

Solving the Schrodinger equation for a free particle gives me this output: What does the $$\psi^{(2,0)}$$ mean here?

closed as off-topic by march, m_goldberg, Bob Hanlon, b.gates.you.know.what, Alex TrounevAug 8 at 7:56

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• "This question arises due to a simple mistake such as a trivial syntax error, incorrect capitalization, spelling mistake, or other typographical error and is unlikely to help any future visitors, or else it is easily found in the documentation." – march, m_goldberg, Bob Hanlon, b.gates.you.know.what, Alex Trounev
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• – kglr Aug 7 at 15:35
• I can see that K[1] is a generated parameter here, but the formatting of $\psi$ doesn't seem to match? – Dan Goldwater Aug 7 at 15:44
• $\psi^{(2,0)}$ is shorthand for the second derivative of $\psi$ in its first argument. – eyorble Aug 7 at 15:47
• .. that is, D[\[Psi][x, t], {x, 2}] – kglr Aug 7 at 15:48