Tonelli-Hobson test
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In mathematics, the Tonelli-Hobson test gives sufficient criteria for a function f on R2 to be integrable. It is often used to establish that Fubini's theorem may be applied to f. It is named for Leonida Tonelli and E. W. Hobson.
More precisely, the Tonelli-Hobson test states that if f is a real-valued measurable function on R2, and either of
or
exists, then f is Lebesgue-integrable on R2.