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What is another field Fichera worked in?

Partial differential equations
Cryptography
Game theory
Graph theory

Answer

Partial differential equations (PDEs) are mathematical equations that describe how a function changes in relation to multiple independent variables. Fichera's work in this field focused on the existence and uniqueness of solutions to PDEs, as well as the development of numerical methods for solving them. His contributions to PDEs have had a significant impact on the field, and his work continues to be cited by researchers today.