code: def _(expr, assumptions):
      arg = expr.args[0]
      if arg.is_Symbol:
          # symbol used as abstract boolean object
          return None
      value = ask(arg, assumptions=assumptions)
      if value in (True, False):
          return not value
      else:
          return None
  
imports: from sympy.assumptions import Q, ask, AppliedPredicate
  from sympy.core import Basic, Symbol
  from sympy.core.logic import _fuzzy_group
  from sympy.core.numbers import NaN, Number
  from sympy.logic.boolalg import And, BooleanTrue, BooleanFalse, conjuncts, Equivalent, Implies, Not, Or
  from sympy.utilities.exceptions import sympy_deprecation_warning
  from ..predicates.common import CommutativePredicate, IsTruePredicate
label_desc: Use image node_id 9 for calling a global function with example usage: _(expr, assumptions) and returns: None, unknown, None