In quantum physics and quantum chemistry, an avoided crossing (AC, sometimes called intended crossing, non-crossing or anticrossing) is the phenomenon where two eigenvalues of a Hermitian matrix representing a quantum observable and depending on k {\displaystyle k} continuous real parameters cannot become equal in value ("cross") except on a manifold of dimension k − 2 {\displaystyle k-2} . The phenomenon is also known as the von Neumann–Wigner theorem.
In quantum physics and quantum chemistry, an avoided crossing (AC, sometimes called intended crossing, non-crossing or anticrossing) is the phenomenon where two eigenvalues of a Hermitian matrix representing a quantum observable and depending on k {\displaystyle k} continuous real parameters cannot become equal in value ("cross") except on a manifold of dimension k − 2 {\displaystyle k-2} . The phenomenon is also known as the von Neumann–Wigner theorem.
Source: Wikipedia "Avoided crossing" · CC BY-SA 4.0
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