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This is the first volume of a collection of papers by internationally prominent logicians, mathematicians, computer scientists, linguists and philosophers in honor of the fiftieth birthday of Jean-Yves Beziau.§It is a state-of-the-art source for cutting edge studies in the new interdisciplinary field of Universal Logic. The papers touch upon a wide range of topics including combination of logic, non-classical logic, square and other geometrical figures of opposition, categorical logic, set theory, foundation of logic, history and philosophy of logic.