Abstract: We investigate the relations between certain bases and quasi-bases,prove that a space has finite rank base if and only if it has finite rank quasi-base,a space has an ortho-base if and only if it has an ortho-quasi-base.是什么意思_Abstract: We investigate the relations between certain bases and quasi-bases,prove that a space has finite rank base if and only if it has finite rank quasi-base,a space has an ortho-base if and only if it has an ortho-quasi-base.在线翻译_英语_读音_用法_例句