# -*- coding: utf-8 -*-
# pytableaux, a multi-logic proof generator.
# Copyright (C) 2014-2023 Doug Owings.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
from __future__ import annotations
from . import LogicType
from . import fde as FDE
from . import s4fde as S4FDE
from . import kfde as KFDE
from . import s5 as S5
from ..tools import group
class Meta(KFDE.Meta):
name = 'S5FDE'
title = 'FDE with S5 modal'
description = 'Modal version of FDE based on S5 normal modal logic'
category_order = 5
extension_of = ('S4FDE')
class Model(S4FDE.Model):
_ensure_global_access = S5.Model._ensure_global_access
def finish(self):
self._check_not_finished()
self._ensure_global_access()
return super().finish()
class System(FDE.System): pass
[docs]
class Rules(LogicType.Rules):
closure = KFDE.Rules.closure
groups = (
*S4FDE.Rules.groups,
group(S5.Rules.Symmetric))