projection
Sign in to saveidempotent mapping of a set into its subset
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continuous function
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idempotence
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equivalence class
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projection
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retract
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mathematics
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geometry
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quantum mechanics
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International Standard Book Number
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Ptolemy
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set theory
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function
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linear algebra
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topology
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set
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line
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sphere
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Euclidean vector
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digital object identifier
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cartography
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