例句與造句

1. 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 ]
   對于單個的toeplitz算子，考慮其符號的內(nèi)外分解，得到了它的滿射只與其幺模部分有關(guān)的結(jié)論，詳細地討論了符號為幺摸函數(shù)的toeplitz算子的各種情況，在討論符號在h ~的特殊情形時，推廣michaelsand [ 2 ]中的定理2到h ~ + c ( t ) ，第二部分簡單地討論了符號在h ~ + c ( t )以及l(fā) ~中的兩個toeplitz算子的乘積的滿射情況，先對toeplitz算子的符號進行分析得到兩個結(jié)論，最后考察了toeplitz算子的乘積的值域包含后移算子的所有非循環(huán)向量的滿射情況，部分地回答了michaelsand在[ 2 ]中提出的toeplitz代數(shù)滿射問題。
2. It's difficult to find backward shift in a sentence. 用backward shift造句挺難的