Counter
Z
Counter \defs [ n : \nat | n \geq 0 ]
Counter::Incr \defs [ %D Counter, v? : \nat | n' = n + v? ]
Counter::Decr \defs [ %D Counter | n > 0; n' = n - 1 ]
Counter::Value \defs [ %X Counter; v! : \nat | v! = n ]
Bounded counter
Bounded::Counter \defs [ Counter | n \leq Max ]
Bounded::Incr \defs [ Counter::Incr | n < Max ]
slide
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An alternative specification of the $Counter$