A new understanding of the BCS Hamiltonian

New second branch of the spectrum of the BCS Hamiltonian and a “pseudogap”

Spectrum and states of the BCS Hamiltonian with sources

Diagonalization of the BCS Hamiltonian and the Bethe equations

Spin Permutation at Work in the BCS Hamiltonian

EXACTLY SOLVABLE, NON-HERMITIAN BCS HAMILTONIAN

Cycle analysis of diagrams generated by Hamiltonians with the BCS topology