Samuel Eilenberg was a prominent mathematician known for his foundational contributions to algebraic topology and category theory. He played a crucial role in developing various concepts that laid the groundwork for modern topology, including cohomology theories and the Eilenberg-Moore spectral sequence, which is a powerful computational tool for homological algebra and cohomology. His work also includes the introduction of Steenrod squares, which provide operations on cohomology classes that enrich the algebraic structure of cohomology theories.
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