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the denominator in (2.7) decreases, bu the author fails to show that this expression does not vanish in the interval (0£¬1). without this the assertion in line 37 is not valid.
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it is not difficult to verify that the function   is strictly decreasing
on (0,1). hence (2.7) implies that the quotient is strictly increasing in (0; 1).
accordingly, from lemma 2.1 and (2.6), it is deduced that the ratio is strictly
increasing in (0; 1).
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6Â¥: Originally posted by whjwd at 2020-11-22 09:33:27
ÂÛÎÄÖеÄÄÚÈÝÔÚÌû×ÓÖÐÓУ¬Õë¶ÔÇ°ÃæµÄ£¨2.7£©£¬Éó¸åÈË˵but the author fails to show that this expression does not vanish in the interval (0£¬1).¾ÍÊÇÕâ¾ä»°ÈÃÎÒÑéÖ¤Ê²Ã´ÄØ...

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whjwd: ½ð±Ò+200, ¡ï¡ï¡ï¡ï¡ï×î¼Ñ´ð°¸ 2020-11-22 10:44:35
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6Â¥: Originally posted by whjwd at 2020-11-22 09:33:27
ÂÛÎÄÖеÄÄÚÈÝÔÚÌû×ÓÖÐÓУ¬Õë¶ÔÇ°ÃæµÄ£¨2.7£©£¬Éó¸åÈË˵but the author fails to show that this expression does not vanish in the interval (0£¬1).¾ÍÊÇÕâ¾ä»°ÈÃÎÒÑéÖ¤Ê²Ã´ÄØ...

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