# 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?

• – kglr Aug 7 '19 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 '19 at 15:44
• $\psi^{(2,0)}$ is shorthand for the second derivative of $\psi$ in its first argument. – eyorble Aug 7 '19 at 15:47
• .. that is, D[\[Psi][x, t], {x, 2}] – kglr Aug 7 '19 at 15:48