Książki

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Being negative or non-negative is a property of a number which is real, or a member of a subset of real numbers such as rational and integer numbers. Negative integers can be regarded as an extension of the natural numbers, such that the expression x - y has a well-defined value for all values of x and y. Other number systems, such as the rational numbers, are then derived as progressively more elaborate extensions and generalizations from the integers. The non-negative numbers are the numbers that are not negative (they are positive or zero). The non-positive numbers are the numbers that are not positive (they are negative or zero). In the context of complex numbers, positive implies real, but for clarity one may say "positive real number".

Negative and Non-Negative Numbers