When a quadratic fermion spectrum was derived in a fixed fermion parity sector, filling all negative-energy modes is permitted only if the resulting particle number has that parity. If it does not, toggle the occupation of a mode with smallest absolute energy. Compare the minimum energies of the physical sectors. Zero-energy modes can create degeneracy without energy cost.

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  1. Fermion parity
  2. Quadratic fermion Hamiltonian
  3. Topological superconductor
  4. Topological quantum matter
  5. Quantum theory
  6. Branches of physics
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