Читать книгу The Big R-Book - Philippe J. S. De Brouwer - Страница 22

This is not an book about exact mathematics. This is a pragmatic book with a focus on practical applications. Therefore, we use the word “definition” also in a practical sense.

Definitions are not always rigorous definitions as a mathematician would be used to. We rather use practical definitions (e.g. how a function is implemented).

The use of a function is – mainly at the beginning of the book – highlighted as follows. For example: