The theory of rings of quotients has its origin in the work of 0. Ore and K. Asano on the construction of the total ring of fractions, in the 1930's and 40's. But the subject did not really develop until the end of the 1950's, when a number of impor
import java.awt.*; import javax.swing.*; import java.awt.event.*; import java.util.*; public class snate extends JFrame implements KeyListener,Runnable { JLabel j; Canvas j1; public static final int canvasWidth = 200; public static final int canvasH
实例：import java.util.Date; import org.xlp.annotation.ExcelOutputed; public class Student { @ExcelOutputed private int id; @ExcelOutputed("姓名") private String name; @ExcelOutputed("生日") private Date timDate; @ExcelOutputed private boole an d; public i
在常见用法中，集合（collection）和数学上直观的集（set）的概念是相同的。集是一个唯一项组，也就是说组中没有重复项。实际上，“集合框架”包含了一个 Set 接口和许多具体的 Set 类。但正式的集概念却比 Java 技术提前了一个世纪，那时英国数学家 George Boole 按逻辑正式的定义了集的概念。大部分人在小学时通过我们熟悉的维恩图引入的“集的交”和“集的并”学到过一些集的理论。
Readers interested in Computer History should not skip this book of Herman Goldstine. It is full of fascinating details and praise for people who contributed to the innovations and developments in the area of computer technology. Goldstine, a fine s
The breathtakingly rapid pace of change in computing makes it easy to overlook the pioneers who began it all. Written by Martin Davis, respected logician and researcher in the theory of computation, The Universal Computer: The Road from Leibniz to Tu
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