An Introduction To Category Theory As A Rigorous, Flexible, And Coherent Modeling Language That Can Be Used Across The Sciences.category Theory Was Invented In The 1940s To Unify And Synthesize Different Areas In Mathematics, And It Has Proven Remarkably Successful In Enabling Powerful Communication Between Disparate Fields And Subfields Within Mathematics. This Book Shows That Category Theory Can Be Useful Outside Of Mathematics As A Rigorous, Flexible, And Coherent Modeling Language Throughout The Sciences. Information Is Inherently Dynamic; The Same Ideas Can Be Organized And Reorganized In Countless Ways, And The Ability To Translate Between Such Organizational Structures Is Becoming Increasingly Important In The Sciences.