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Alexandre Duret-Lutz 2017-05-11 10:18:00 +02:00
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@ -1060,18 +1060,17 @@ better choices.
There are actually several property flags that are stored into each
automaton, and that can be queried or set by algorithms:
| flag name | meaning when =true= |
|----------------------+-------------------------------------------------------------------------------------------------------------------------------------------|
| =state_acc= | automaton should be considered as having state-based acceptance |
| =inherently_weak= | accepting and rejecting cycles cannot be mixed in the same SCC |
| =weak= | transitions of an SCC all belong to the same acceptance sets |
| =very_weak= | weak automaton where all SCCs have size 1 |
| =terminal= | automaton is weak, accepting SCCs are complete, accepting edges may not go to rejecting SCCs |
| =complete= | it is always possible to move the automaton forward, using any letter |
| =universal= | there is no non-determinism branching in the automaton (hence each word is *recognized* by at most one run, but not necessarily accepted) |
| =semi_deterministic= | any nondeterminism occurs before entering an accepting SCC |
| =unambiguous= | there is at most one run *accepting* a word (but it might be recognized several time) |
| =stutter_invariant= | the property recognized by the automaton is [[https://www.lrde.epita.fr/~adl/dl/adl/michaud.15.spin.pdf][stutter-invariant]] |
| flag name | meaning when =true= |
|----------------------+----------------------------------------------------------------------------------------------|
| =state_acc= | automaton should be considered as having state-based acceptance |
| =inherently_weak= | accepting and rejecting cycles cannot be mixed in the same SCC |
| =weak= | transitions of an SCC all belong to the same acceptance sets |
| =very_weak= | weak automaton where all SCCs have size 1 |
| =terminal= | automaton is weak, accepting SCCs are complete, accepting edges may not go to rejecting SCCs |
| =deterministic= | there is at most one run *recognizing* a word, but not necessarily accepting it |
| =semi_deterministic= | any nondeterminism occurs before entering an accepting SCC |
| =unambiguous= | there is at most one run *accepting* a word (but it might be recognized several time) |
| =stutter_invariant= | the property recognized by the automaton is [[https://www.lrde.epita.fr/~adl/dl/adl/michaud.15.spin.pdf][stutter-invariant]] |
For each flag =flagname=, the =twa= class has a method
=prop_flagname()= that returns the value of the flag as an instance of