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There is a graphical representation (keys) of all operators.
Following the cursor position, every operator symbol is dynamically interpreted
in the system info bar, where, by the way,
the number of entered characters appears.
There is also a system message bar and, finally,
a function buttons bar ,
where, following to the situation, some buttons appear and disappear.
The user can find there, among others, the button Save
for writing the formula to the Formulae file
(' formfile ' under the Finder) accessible from the Formula menu.
The syntax of the formula requires sometimes the utilization of the square brackets.
Clicking on any operator key inserts the operator symbol as well as, if required,
the brackets with the semicolon character when the operator needs two arguments.
One can also select some range of the formula and click on any operator key.
In such a case, the operator symbol is inserted with the selected part as argument.
However, in this situation the semicolon character is not inserted.
Of course, there is no obligation to use the operator keys when typing the formula.
The blanks are not taken into account by the application.
The user can use them to make the formula more transparent.
The system will delete them in the phase of the compilation of the formula.
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