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In page Category theory:

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Stanislaw Ulam, and some writing on his behalf, have claimed that related ideas were current in the late 1930s in Poland.[citation needed] Eilenberg was Polish, and studied mathematics in Poland in the 1930s.[4] Category theory is also, in some sense, a continuation of the work of Emmy Noether (one of Mac Lane's teachers) in formalizing abstract processes;[5] Noether realized that understanding a type of mathematical structure requires understanding the processes that preserve that structure (homomorphisms).[citation needed] Eilenberg and Mac Lane introduced categories for understanding and formalizing the processes (functors) that relate topological structures to algebraic structures (topological invariants) that characterize them.