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phchen
  • Member for 9 years, 2 months
  • Last seen more than 4 years ago
  • Singapore
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Student major in pure physics and pure mathematics. Be interested in differential geometry, general relativity, topological insulator.

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6
How to prove the eigenvalues of this matrix $A$ come in pairs $\pm\lambda$?
5
What's the condition for a matrix $A$ ($2N\times 2N$ dimension) to have eigenvalues in pairs $\pm\lambda$?
5
Prove time-dependent hamiltonian is hermitian from unitarity of time-evolution operator