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Ryad otrimanij vidkidannyam vid pochatkovogo n pershih chleniv nazivayetsya n m zalishkom ryadu Poznachennya r n k n 1 a k displaystyle r n sum k n 1 infty a k Vsi chleni krim tih sho vhodyat v n j zalishok ryadu v sumi dayut tak zvanu n u chastkovu sumu ryadu VlastivostiDlya zalishku ryadu spravedlivi taki tverdzhennya Yaksho ryad zbizhnij to zbizhnij bud yakij jogo zalishok Yaksho hocha b odin zalishok ryadu zbizhnij to j sam ryad zbizhnij Yaksho ryad zbizhnij to lim n k n 1 a k 0 displaystyle lim n to infty sum k n 1 infty a k 0 dd Isnuyut sposobi ocinki zalishku ryadu za dopomogoyu integralnoyi oznaki Koshi dlya znakododatnogo ryadu i oznaki zbizhnosti Lejbnica dlya znakoperemizhnogo ryadu
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