def supports(cogstate,formula): result = True for world in cogstate: if world[meta][FS]: if not formulaIsTrue(world, formula): result = False return result
def formulaIsConsistent(cogstate, formula): """ INPUT: a pair (cognitive state, formula) OUTPUT: a cognitive state WHAT IT DOES: Should tell you whether the formula is true in at least one world in FS. """ for world in cogstate: if world[meta][US]: if formulaIsTrue(world, formula): return True return False
def propositionFromFormula(cogstate, formula): """ INPUT: A pair (cognitive state, formula) which are a list and a string, respectively. OUTPUT: A list. WHAT IT DOES: Given the cognitive state, it looks through each world in US and checks whether the formula is true there. If so, it adds it to a list. The list at the end will be the proposition denoted by the formula. """ proposition = [] for world in cogstate: if formulaIsTrue(world, formula): proposition.append(world[meta][name]) return proposition
def updateFormula(cogstate, formula): """ INPUT: a pair (cognitive state, formula) where cognitive states are arrays of world objects and formulas are strings. OUTPUT: another cognitive state WHAT IT DOES: It should go through each world and call a function that checks whether the formula is true at each world. If it isn't, mark it as not being in FS; do nothing otherwise. """ newstate = [] if formulaIsConsistent(cogstate, formula): for world in cogstate: if not formulaIsTrue(world, formula): world[meta][FS] = False newstate.append(world) else: newstate = destroyAllWorlds(cogstate) return newstate
def updateLaw(cogstate, law): """ INPUT: a pair (cognitive state, law) where cognitive states are arrays of world objects and the law is a string OUTPUT: another cognitive state WHAT IT DOES: Should go through each world and call a function that checks whether the formula is true at each world, and if it is do nothing, else mark it as not being in US or FS. """ newstate = [] if formulaIsConsistent(cogstate, law): for world in cogstate: if not formulaIsTrue(world, law): world[meta][FS] = False world[meta][US] = False newstate.append(world) else: newstate = destroyAllWorlds(cogstate) return newstate
