In non-degenerate time-independent perturbation theory we see that the second order correction to the eigenstate energy exhibits 'level repulsion'.
Is this a purely mathematical curiousity or is there physical intuition that can be gained here?
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$\begingroup$ Possible duplicate: Why is the second order perturbative correction to the ground state energy always down? $\endgroup$– Qmechanic ♦Commented Sep 22, 2020 at 10:48
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2$\begingroup$ It's better to type up equations in MathJax than to copy images. I think the answer from @Qmechanic the the linked post does answer your question though. $\endgroup$– jacob1729Commented Sep 22, 2020 at 10:51
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