His first idea was to get rid of the term next to the highest in degree by a substitution . 他的头一个想法是用置换法消去比最高次项次数小一次的项。
The stabilizer of the number k, written stk, is the set of all permutations of g that leave k fixed . G中保持K不变的置换所成之集称为数K的稳定子，记作Stk。
This classification is called the parity of the permutation analogous to the definition of parity of integers . 这种分类叫作置换的奇偶性，类似于整数偶性的定义。
Modern stirling engine can be divided into two main categories-displacer type machines and double-acting machines . 现代的斯特林发动机可分成两大类：置换式发动机和双作用发动机。
It turns out that all these problems can be solved at once, provided we learn enough about the cycle structure of permutations . 结果是，所有这些问题都可以一次解决，只要我们充分地了解各置换的循环结构。
Because the stream moving along the bottom displaces the lighter fluid upward, a force must be provided to overcome boundary resistance . 因为沿底部运动的异重流与上部较轻的流体置换，必须产生一种力来克服边界阻力。
The predominance of these series is replaced in turn by benzothiophenes and increasingly complex ring-like compounds in the higher temperature ranges . 在更高的温度范围内，这些化合物的绝大部分又被苯噻吩和更复杂的环状化合物置换。
Replaceable cement pipe , cast iron pipe and steel pipe 可置换水泥管铸铁管和钢管
The pennutstion of multiple - valued logical function group 多值逻辑函数组的置换
Numerical simulation study of displacement ventilation 置换通风的数值模拟研究
