【摘要】 收敛级数任意加括号后所得级数仍收敛。一般来说,它的逆命题不正确,但附加一些条件,却有可能是正确的,文中对此展开了讨论,并由此得出一定条件下级数的去括号律,以此来研究循环抽项交换规律。更多还原

【Abstract】 When brackets are arbitrarily added into a convergent series, a new convergent series must be got. In a general way, its converse theorem is not correct. But if append some conditions, it may be correct. Aiming to discuss it, laws of off-bracket and circulatory exchange of item extraction for infinite series were derived under certain conditions.更多还原