We use theory of trees, B-series, P-trees and P-series to deduce the order conditions of the methods constructed.
分别应用根树、B -级数理论、P -根树、P -级数理论推导方法的阶条件。
2
Environmental and safety rules and regulations and replacement of E-series glycol ethers by P-series glycol ether are the major restraints for the E-series glycol ether market.
同时，环境和安全性相关法规和P系列乙二醇醚的替代成为妨碍该市场成长的要素。
3
P. S. - If you are interested in memory, you may also want to see my earlier series on 5 Key Paths to Improving memory as well as my podcast with Fiona McPherson from About memory.