If all Variables included in a particular algebraic expression would be substituted by some values this provides us with an arithmetical expression that can be evaluated and the result is a numerical value. Inequalities is called a system of algebraic Equations or simply an algebraic system. A set of values corresponding to a set of Variables involved in an algebraic system we will call a solution if this set is a solution for all Equations that the system consist of. Names of Folders can be changed by a simple renaming command or by using Find and Replace. Folders are arranged in an alterable tree like structure, similar to file manager.
Folders are purely a navigational aid to locate information more easily.
There is no representation of cross links between Folders in different branches in the Tree. You have complete freedom to choose your own criteria in allocating data to Folders. When planning models, remember that some particular Variable is allocated to one and only one Folder and resides only there. Variables Variables are arranged in a sheet structure. A Variable exists for each Cell in a Sheet.