SEARCH Articles Figures Tables Bogoliubov inequality Bogoliubov method Bogoliubov transformation Bogoliubov-de Gennes equations Bounds and Inequalities The Bogoliubov Inequality Gibbs-Bogoliubov inequality Gibbs-Bogoliubov variational principle Relativistic Bogoliubov-de Gennes equations The Bogoliubov variational theorem