A fiber bundle is a structure in mathematics that consists of a base space, a total space, and a fiber, which is a space that 'sits over' each point in the base space. It allows for the study of how different spaces are connected and structured through the fibers, which can vary smoothly across the base. Fiber bundles are crucial in understanding the geometry and topology of manifolds, especially when dealing with differentiable structures that often arise in the study of Lie groups and algebras.
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