From teaching experience. III. Crystallography of icosahedral viruses

The article is devoted to the morphological systematics of icosahedral viruses. It is shown that fixation of capsids by the triangulation numbers does not distinguish the isomers. Description of capsids by symmetry point groups (- 5 - 3m and 532 ) is greatly detailed. In their diversity, homologous series connected in pairs are distinguished. Within the series, capsids are linked by a similarity transformation. The series are connected by the transition to the dual polyhedra. Capsid generators that are not reducible to simpler forms and produce the entire variety of icosahedral capsids are defined.