通过引进Bessel控制函数,并对它的充分性和必要性作研究,建立了对仿射Bessel序列的新的判别法.最后提出几个未解决的问题.
By introducing Bessel control functions, and studying its necessary conditions and sufficient conditions, a new criterion for affine Bessel sequences with control functions is established. Furthermore, some open questions are posed.