Question

How to implement if-then-else using Z3 python API as a part of conjunction of first order formulas? e.g.

s.add( F, H, (if then else)).

A related question is: how to use Boolean “Implies” or “if” commands given in Z3 python online guide for this purpose?

Answer 1

An expression if(A, B, C) in encoded in the Z3 Python API using If(A, B, C).
Here is an example:

F, H, A, B, C = Bools('F H A B C')
s = Solver()
s.add(F, H, If(A, B, C))
print s

Here is another example using “implies”

F, H, A, B, C = Bools('F H A B C')
s = Solver()
s.add(F, H, Implies(A, B))
print s

The links for the examples above are: http://rise4fun.com/Z3Py/4BF, http://rise4fun.com/Z3Py/JEU