#1
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1) µéͧ·ÓÍÂèÒ§ääÃѺ 2) ¨Ò¡ absolute convergent ËÅѧ¨Ò¡ take lim n-> inf ¨Ðä´é 1/2 ¨ÐÊÒÁÒöÊÃØ»ÇèÒÅÙèÍÍ¡ä´éàÅÂËÃ×Íà»ÅèÒ¤ÃѺ 3) ¢Ñ´ààÂ駷Äɮպ··ÕèÇèÒ a_n+1 <= a_n |
#2
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1) âŻԵÒÅäÁè¡ÕèÇÔÍÍ¡
2),3) ÍÐää×Í ¨§ãªéabsolutely convergentËÒ¤ÃѺ ¹Ñè¹Áѹ¤Ø³ÊÁºÑµÔ¢Í§Í¹Ø¡ÃÁ·ÕèºÍ¡ÇèÒ Σ a_n is an abso. Conv. Seq. If Σla_nl conv.
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Mathematics, rightly viewed possesses not only truth, but supreme beauty. B.R. |
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