On improving efficiency of model checking through systematically ...

Appendix B
Nbac output systems
B.1 Tiny example
state
ok, init, b1, b0 : bool;
y, x : int;
input
p2, p1 : bool;
transition
y’ = if (init) and true
then 0
else if (not init) and true
and ((not b1 and not b0) or (b1 and b0))
then y
else if (not init) and true
and ((b1 and not b0) or (not b1 and b0))
then y+1
else 0;
x’ = if (init) and true
then 0
else if (not init) and true
and ((not b1 and not b0) or (b1 and b0))
then x+1
else if (not init) and true
and ((b1 and not b0) or (not b1 and b0))
then x
else 0;
b1’ = (not init and b0) and true;
b0’ = (not init and not b1) and true;
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