User phchen - MathOverflow

phchen

Member for 8 years, 7 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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Sep 22, 2015

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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 $\pm\lambda$?