Backup diff of First Example vs current(No. 1)

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The following program (also called a '''model''') describes a sawtooth function
with the following shape:

The following program (also called a '''model''') describes a sawtooth function.

 INIT     <=> f=0.
 INCREASE <=> [](f'=3).
 DROP     <=> [](f- = 10 => f = 0).
 INIT     <=> 0 <= f = 2.
 INCREASE <=> [](f' = 1).
 DROP     <=> [](f- = 2 => f = 0).

The first three lines (often called '''rules''' or '''named constraints''') define three constraints, and the final line combines those rules.

This program defines the trajectory of a variable f (whose value is a function of nonnegative time) in the following way.
- The rule INIT defines the value of f at time 0, which takes an uncertain value between 0 and 2.
- The rule INCREASE states that the slope of f is always 1.
- The rule DROP states that the value of f is reset to 0 whenever the value reaches 2. (The minus sign after f means the left limit of f).
- The final line states that
-- INIT is enabled,
-- DROP is enabled, and
-- INCREASE is enabled whenever it is consistent with DROP (that is, the priority of DROP is higher than INCREASE).

More examples can be found in the [[Examples]] page.