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In [1]:
import proveit
from proveit import defaults
from proveit.logic import Implies, Forall, Boolean
from proveit import PofA, QofA, P, A, Q
from proveit.logic import QimplPofTrue, QimplPofFalse, PofTrue, PofFalse
from proveit.logic.booleans import forall_over_bool_by_cases
theory = proveit.Theory() # the theorem's theory
In [2]:
%proving conditioned_forall_over_bool_by_cases
With these allowed/disallowed theorem/theory presumptions (e.g., to avoid circular dependencies), we begin our proof of
conditioned_forall_over_bool_by_cases:
(see dependencies)
In [3]:
defaults.assumptions = (conditioned_forall_over_bool_by_cases.conditions + 
                        conditioned_forall_over_bool_by_cases.instance_expr.conditions)
defaults.assumptions:
In [4]:
forall_over_bool_by_cases
In [5]:
forall_over_bool_by_cases_spec = forall_over_bool_by_cases.instantiate({PofA:Implies(QofA,PofA)})
forall_over_bool_by_cases_spec: ,  ⊢  
In [6]:
QAimplPA = forall_over_bool_by_cases_spec.generalize((P, Q), conditions=forall_over_bool_by_cases_spec.assumptions)
QAimplPA:  ⊢  
In [7]:
QAimplPA.instantiate({P:P, Q:Q, A:A})
, ,  ⊢  
conditioned_forall_over_bool_by_cases may now be readily provable (assuming required theorems are usable).  Simply execute "%qed".
In [8]:
%qed
proveit.logic.booleans.conditioned_forall_over_bool_by_cases has been proven.
Out[8]:
 step typerequirementsstatement
0generalization1  ⊢  
1modus ponens2, 3, , ,  ⊢  
2instantiation4, 5, ,  ⊢  
  :
3assumption  ⊢  
4instantiation6, 7, 8,  ⊢  
  :
5assumption  ⊢  
6conjecture  ⊢  
 proveit.logic.booleans.forall_over_bool_by_cases
7assumption  ⊢  
8assumption  ⊢