Volpert graph explained

Volpert graph, Vol'pert graph or Wolpert graph may refer to:

• Volpert nomogram, a diagram better known as "Smith chart" coinvented by Russian engineer Amiel Rafailovich Volpert (Russian: Амиэ́ль Рафаилович Во́льперт)
• Volpert graph (chemistry), a chemical reaction graph by Russian mathematician Aizik Isaakovich Volpert (German: Айзик Исаакович Вольперт)
• Volpert graph (psychology), a diagram in action regulation theory by German psychologist