He did not use negative numbers , which he regarded as contradictory , but introduced a complicated scheme called " correspondence of signs " 他不使用他认为有矛盾的负数，却引进了一套复杂的图表，称为“正负号的对应” 。
Note that numeric literals do not include a sign ; a phrase like - 1 is actually an expression composed of the operator - and the literal 1 注意数值型的字面值不包括符号(译注:正负号) ,像- 1实际上是个组合了一元运算符" - "和字面值1的表达式
Note that numeric literals do not include a sign ; a phrase like - 1 is actually an expression composed of the unary operator ` - ' and the literal 1 注意数值型的字面值不包括符号(译注:正负号) ,像- 1实际上是个组合了一元运算符" - "和字面值1的表达式
