WebFormal theory. Formally, a string is a finite, ordered sequence of characters such as letters, digits or spaces. The empty string is the special case where the sequence has length zero, so there are no symbols in the string.

WebA geographic information system (GIS) is a type of database containing geographic data (that is, descriptions of phenomena for which location is relevant), combined with software tools for managing, analyzing, and visualizing those data. In a broader sense, one may consider such a system to also include human users and support staff, procedures and …

WebWhat actually makes a work of literature a ‘classic book’ is not just a consideration of extensively published authors. In 1920, Fannie M. Clark, a teacher at the Rozelle School in East Cleveland, Ohio, predates Calvino’s similar conclusions by 60 years when she also essayed the question of what makes a book a ‘classic’ in her article “Teaching Children …