The notion of pushforward in mathematics is "dual" to the notion of pullback, and can mean a number of different but closely related things. * Pushforward (differential), the differential of a smooth map between manifolds, and the "pushforward" operations it defines * Pushforward (homology), the map induced in homology by a continuous map between topological spaces * Pushforward measure, measure induced on the target measure space by a measurable function * Pushout (category theory), the categorical dual of pullback * Direct image sheaf, the pushforward of a sheaf by a map * Fiberwise integral, the direct image of a differential form or cohomology by a smooth map, defined by "integration on the fibres" * Transfer operator, the pushforward on the space of measurable functions; its ad
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