backward adv. 向后,在后,在后方;倒,逆;回向原处。 lean backwards 往后靠。 spell backwards 倒拼;误解,曲解。 backward(s) and forward(s) 忽前忽后;来回地。 go backwards 倒退,退步,堕落。 say backwards 倒说。 adj. 1.向后方的,向后的。 2.倒的;反的,相反的。 3.落后的,晚的;迟缓的,慢的;进步慢的。 4.愚钝的;畏缩的,迟疑的,怕羞的。 a backward child 智力差(落于人后)的孩子。 The country is in a backward state. 那个国家是落后的。 Summer is backward this year. 今年夏天来得晚。 be backward in (preparations, duty) (准备)迟缓;忽视(责任)。 adv. -ly ,-ness n. 落后,迟疑。
We detailed toeplitz operator with unomodular symbol , and generated the theorem proved by michael sand in [ 2 ] from h to h + c ( t ) . in the second part of this paper , the author discussed simply when multipliction of two toeplitz operators with symbol in h + c ( t ) or in l . we got two conclusions by analyzing symbol of toeplitz operators . the last , we investigated whether multiplication of two toeplitz operators , which range included all non - cyclic vectors of backward shift , is surjective , and partly answered the question about surjective toeplitz algebra posed by michael sand in [ 2 ] 对于单个的toeplitz算子,考虑其符号的内外分解,得到了它的满射只与其幺模部分有关的结论,详细地讨论了符号为幺摸函数的toeplitz算子的各种情况,在讨论符号在h ~的特殊情形时,推广michaelsand [ 2 ]中的定理2到h ~ + c ( t ) ,第二部分简单地讨论了符号在h ~ + c ( t )以及l ~中的两个toeplitz算子的乘积的满射情况,先对toeplitz算子的符号进行分析得到两个结论,最后考察了toeplitz算子的乘积的值域包含后移算子的所有非循环向量的满射情况,部分地回答了michaelsand在[ 2 ]中提出的toeplitz代数满射问题。