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  • https://ukrayinska.libretexts.org/%D0%9C%D0%B0%D1%82%D0%B5%D0%BC%D0%B0%D1%82%D0%B8%D0%BA%D0%B0/%D0%90%D0%BD%D0%B0%D0%BB%D1%96%D0%B7/%D0%92%D1%81%D1%82%D1%83%D0%BF_%D0%B4%D0%BE_%D1%80%D0%B5%D0%B0%D0%BB%D1%8C%D0%BD%D0%BE%D0%B3%D0%BE_%D0%B0%D0%BD%D0%B0%D0%BB%D1%96%D0%B7%D1%83_(Lebl)/06%3A_%D0%86%D0%BD%D1%82%D0%B5%D0%B3%D1%80%D0%B0%D0%BB_%D0%A0%D1%96%D0%BC%D0%B0%D0%BD%D0%B0/6.06%3A_%D1%82%D0%B5%D0%BC%D0%BF
    ДозволятиP бути розділом[a,b], потім визначити\ [\ begin {вирівняний} & m_i: =\ inf\ {f (x): x_ {i-1}\ leq x\ leq x_i\},\\ & m_i: =\ sup\ {f (x): x_ {i-1}\ leq x\ leq x_i\},\\ & L (P, f,\ альф...ДозволятиP бути розділом[a,b], потім визначити\ [\ begin {вирівняний} & m_i: =\ inf\ {f (x): x_ {i-1}\ leq x\ leq x_i\},\\ & m_i: =\ sup\ {f (x): x_ {i-1}\ leq x\ leq x_i\},\\ & L (P, f,\ альфа) := \ sum_ {i=1} ^n m_i\ bigl (\ альфа (x_i) -\ альфа (x_ {i-1})\ великий),\\ & U ( P, f,\ альфа) := \ sum_ {i=1} ^n m_i\ bigl (\ альфа (x_i) -\ альфа (x_ {i-1})\ бігр). \ end {aligned}\]L(P,f,α) U(P,f,α)Викликаємо і.