디리클레 함수
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mathematics
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International Standard Book Number
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real number
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rational number
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irrational number
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Johann Peter Gustav Lejeune Dirichlet
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continuous function
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periodic function
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Riemann integral
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constant function
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indicator function
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dense set
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Lebesgue integration
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Princeton University Press
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Lebesgue measure
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Encyclopedia of Mathematics
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Thomae's function
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European Mathematical Society
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monotone convergence theorem
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meagre set
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