def refine_abs(expr, assumptions):
 from sympy.core.logic import fuzzy_not
 arg = expr.args[0]
 if (ask(Q.real(arg), assumptions) and fuzzy_not(ask(Q.negative(arg), assumptions))):
  return arg
 if ask(Q.negative(arg), assumptions):
  return (- arg)

def refine_abs ( expr , assumptions ) : from sympy . core . logic import fuzzy_not arg = expr . args [ 0 ] if ( ask ( Q . real ( arg ) , assumptions ) and fuzzy_not ( ask ( Q . negative ( arg ) , assumptions ) ) ) : return arg if ask ( Q . negative ( arg ) , assumptions ) : return ( - arg )
handler for the absolute value .