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## Formulae

A formula is any arithmetic expression which may contain all variables and functions known to the system.
The result of a formula may be taken as input for all parameters for which a numerical value is permitted.
If it is possible to save a constructional relation under a certain command, you may control with the help of rule 8 whether the formula is saved as such or only as the current value of it. This is decisive for the future behavior of SISCAD-P.