示例#1
0
 /**
  * {<S ==> M>, <M ==> P>} |- {<S ==> P>,
  *
  * <P ==>S>}
  *
  * @param term1 Subject of the first new task
  * @param term2 Predicate of the first new task
  * @param sentence The first premise
  * @param belief The second premise
  */
 static void dedExe(Term term1, Term term2, Sentence sentence, Judgment belief) {
   if (RDFStatement.invalidStatement(term1, term2)) {
     return;
   }
   TruthValue value1 = sentence.getTruth();
   TruthValue value2 = belief.getTruth();
   TruthValue truth1 = null;
   TruthValue truth2 = null;
   BudgetValue budget1, budget2;
   if (sentence instanceof Question) {
     budget1 = BudgetFunctions.backwardWeak(value2);
     budget2 = BudgetFunctions.backwardWeak(value2);
   } else {
     if (sentence instanceof Goal) {
       truth1 = TruthFunctions.desireWeak(value1, value2);
       truth2 = TruthFunctions.desireWeak(value1, value2);
     } else {
       truth1 = TruthFunctions.deduction(value1, value2);
       truth2 = TruthFunctions.exemplification(value1, value2);
     }
     budget1 = BudgetFunctions.forward(truth1);
     budget2 = BudgetFunctions.forward(truth2);
   }
   TemporalValue order1 = sentence.getContent().getOrder();
   TemporalValue order2 = belief.getContent().getOrder();
   TemporalValue order = TemporalRules.syllogistic(order1, order2);
   RDFStatement content1 =
       RDFStatement.make((RDFStatement) sentence.getContent(), term1, term2, order);
   RDFStatement content2 =
       RDFStatement.make(
           (RDFStatement) sentence.getContent(), term2, term1, TemporalValue.getReverse(order));
   Memory.doublePremiseTask(budget1, content1, truth1);
   Memory.doublePremiseTask(budget2, content2, truth2);
 }
示例#2
0
 /**
  * {<M --> S>, <M --> P>} |- <<#x --> S> ==> <#x --> P>> {<M --> S>, <M --> P>} |- <<#x --> S> <=>
  * <#x --> P>>
  *
  * @param sentence1 The first premise <M --> S>
  * @param sentence2 The second premise <M --> P>
  * @param figure The figure indicating the location of the shared term
  * @param isImplication The conclusion is Implication, not Equivalence
  */
 private static RDFStatement introVarInd(
     Sentence sentence1, Sentence sentence2, int figure, boolean isImplication) {
   RDFStatement premise1 = (RDFStatement) sentence1.getContent();
   RDFStatement premise2 = (RDFStatement) sentence2.getContent();
   RDFStatement state1, state2;
   Variable v1 = new Variable(Symbols.VARIABLE_TAG + "0");
   Variable v2 = new Variable(Symbols.VARIABLE_TAG + "0");
   if (figure == 11) {
     state1 = RDFStatement.make(premise1, v1, premise1.getPredicate());
     state2 = RDFStatement.make(premise2, v2, premise2.getPredicate());
   } else {
     state1 = RDFStatement.make(premise1, premise1.getSubject(), v1);
     state2 = RDFStatement.make(premise2, premise2.getSubject(), v2);
   }
   TemporalValue tense1 = sentence1.getTense();
   TemporalValue tense2 = sentence2.getTense();
   TemporalValue tense = TemporalRules.tenseInduction(tense1, tense2);
   if (tense == null) {
     return null;
   }
   RDFStatement content;
   if (isImplication) {
     content = Implication.make(state1, state2, tense);
   } else {
     content = Equivalence.make(state1, state2, tense);
   }
   return content;
 }
示例#3
0
 /**
  * {<M ==> S>, <M ==> P>} |- {<S ==> P>,
  *
  * <P ==>S>, <S <=> P>}
  *
  * @param term1 Subject of the first new task
  * @param term2 Predicate of the first new task
  * @param taskSentence The first premise
  * @param belief The second premise
  * @param figure Locations of the shared term in premises
  */
 static void abdIndCom(
     Term term1, Term term2, Sentence taskSentence, Judgment belief, int figure) {
   if (RDFStatement.invalidStatement(term1, term2)) {
     return;
   }
   RDFStatement st1 = (RDFStatement) taskSentence.getContent();
   RDFStatement st2 = (RDFStatement) belief.getContent();
   TruthValue truth1 = null;
   TruthValue truth2 = null;
   TruthValue truth3 = null;
   BudgetValue budget1, budget2, budget3;
   TruthValue value1 = taskSentence.getTruth();
   TruthValue value2 = belief.getTruth();
   if (taskSentence instanceof Question) {
     budget1 = BudgetFunctions.backward(value2);
     budget2 = BudgetFunctions.backwardWeak(value2);
     budget3 = BudgetFunctions.backward(value2);
   } else {
     if (taskSentence instanceof Goal) {
       truth1 = TruthFunctions.desireStrong(value1, value2);
       truth2 = TruthFunctions.desireWeak(value2, value1);
       truth3 = TruthFunctions.desireStrong(value1, value2);
     } else {
       truth1 = TruthFunctions.abduction(value1, value2);
       truth2 = TruthFunctions.abduction(value2, value1);
       truth3 = TruthFunctions.comparison(value1, value2);
     }
     budget1 = BudgetFunctions.forward(truth1);
     budget2 = BudgetFunctions.forward(truth2);
     budget3 = BudgetFunctions.forward(truth3);
   }
   TemporalValue order1 = st1.getOrder();
   TemporalValue order2 = st2.getOrder();
   TemporalValue order = TemporalRules.syllogistic(order1, order2, figure);
   //        if (tense == null) {
   //            tense = TemporalValue.WHEN;
   //            truth1 = TruthFunctions.temporalInduction(truth1);
   //            truth2 = TruthFunctions.temporalInduction(truth2);
   //            truth3 = TruthFunctions.temporalInduction(truth3);
   //        }
   RDFStatement statement1, statement2, statement3;
   statement1 = RDFStatement.make(st1, term1, term2, order);
   statement2 = RDFStatement.make(st1, term2, term1, TemporalValue.getReverse(order));
   statement3 = RDFStatement.makeSym(st1, term1, term2, order);
   Memory.doublePremiseTask(budget1, statement1, truth1);
   Memory.doublePremiseTask(budget2, statement2, truth2);
   Memory.doublePremiseTask(budget3, statement3, truth3);
   if (statement1.isConstant()) {
     Memory.doublePremiseTask(budget1, introVarInd(belief, taskSentence, figure, true), truth1);
     Memory.doublePremiseTask(budget2, introVarInd(taskSentence, belief, figure, true), truth2);
     Memory.doublePremiseTask(budget3, introVarInd(taskSentence, belief, figure, false), truth3);
   }
 }
示例#4
0
 /**
  * {<S <=> M>, <M <=> P>} |- <S <=> P>
  *
  * @param term1 Subject of the new task
  * @param term2 Predicate of the new task
  * @param belief The first premise
  * @param sentence The second premise
  * @param figure Locations of the shared term in premises
  */
 static void resemblance(Term term1, Term term2, Judgment belief, Sentence sentence, int figure) {
   if (RDFStatement.invalidStatement(term1, term2)) {
     return;
   }
   RDFStatement st1 = (RDFStatement) belief.getContent();
   RDFStatement st2 = (RDFStatement) sentence.getContent();
   TruthValue truth = null;
   BudgetValue budget;
   Task task = Memory.currentTask;
   if (sentence instanceof Question) {
     budget = BudgetFunctions.backward(belief.getTruth());
   } else {
     if (sentence instanceof Goal) {
       truth = TruthFunctions.desireStrong(sentence.getTruth(), belief.getTruth());
     } else {
       truth = TruthFunctions.resemblance(belief.getTruth(), sentence.getTruth());
     }
     budget = BudgetFunctions.forward(truth);
   }
   TemporalValue order1 = st1.getOrder();
   TemporalValue order2 = st2.getOrder();
   TemporalValue order = TemporalRules.syllogistic(order1, order2, figure);
   Term statement = RDFStatement.make(st1, term1, term2, order);
   Memory.doublePremiseTask(budget, statement, truth);
 }
示例#5
0
 /**
  * {<S ==> P>, <M <=> P>} |- <S ==> P>
  *
  * @param term1 Subject of the new task
  * @param term2 Predicate of the new task
  * @param asym The asymmetric premise
  * @param sym The symmetric premise
  * @param figure Locations of the shared term in premises
  */
 static void analogy(Term term1, Term term2, Sentence asym, Sentence sym, int figure) {
   if (RDFStatement.invalidStatement(term1, term2)) {
     return;
   }
   RDFStatement asymSt = (RDFStatement) asym.getContent();
   RDFStatement symSt = (RDFStatement) sym.getContent();
   TruthValue truth = null;
   BudgetValue budget;
   Sentence sentence = Memory.currentTask.getSentence();
   CompoundTerm taskTerm = (CompoundTerm) sentence.getContent();
   if (sentence instanceof Question) {
     if (taskTerm.isCommutative()) {
       budget = BudgetFunctions.backwardWeak(asym.getTruth());
     } else {
       budget = BudgetFunctions.backward(sym.getTruth());
     }
   } else {
     if (sentence instanceof Goal) {
       if (taskTerm.isCommutative()) {
         truth = TruthFunctions.desireWeak(asym.getTruth(), sym.getTruth());
       } else {
         truth = TruthFunctions.desireStrong(asym.getTruth(), sym.getTruth());
       }
     } else {
       truth = TruthFunctions.analogy(asym.getTruth(), sym.getTruth());
     }
     budget = BudgetFunctions.forward(truth);
   }
   TemporalValue order1 = asymSt.getOrder();
   TemporalValue order2 = symSt.getOrder();
   TemporalValue order;
   switch (figure) {
     case 11:
     case 12:
       order = TemporalRules.syllogistic(order2, order1, figure);
       break;
     case 21:
     case 22:
       order = TemporalRules.syllogistic(order1, order2, figure);
       break;
     default:
       return;
   }
   Term content = RDFStatement.make(asymSt, term1, term2, order);
   Memory.doublePremiseTask(budget, content, truth);
 }
示例#6
0
 /**
  * {<M ==> S>, <M ==> P>} |- {<S ==> P>,
  *
  * <P ==>S>, <S <=> P>}
  *
  * @param task1 The first premise
  * @param task2 The second premise
  * @param order Temporal order of the terms in conclusion
  */
 public static void temporalIndCom(Task task1, Task task2, TemporalValue order) {
   Judgment judg1 = (Judgment) task1.getSentence();
   Judgment judg2 = (Judgment) task2.getSentence();
   Stamp stamp = Stamp.make(judg1.getStamp(), judg2.getStamp());
   if (stamp == null) {
     return;
   }
   Memory.currentStamp = stamp;
   Term term1 = judg1.getContent();
   Term term2 = judg2.getContent();
   if ((term1 instanceof Inheritance) && (term2 instanceof Inheritance)) {
     RDFStatement s1 = (RDFStatement) term1;
     RDFStatement s2 = (RDFStatement) term2;
     Variable var1 = new Variable(Symbols.VARIABLE_TAG + "0");
     Variable var2 = new Variable(Symbols.VARIABLE_TAG + "0");
     if (s1.getSubject().equals(s2.getSubject())) {
       term1 = RDFStatement.make(s1, var1, s1.getPredicate());
       term2 = RDFStatement.make(s2, var2, s2.getPredicate());
     } else if (s1.getPredicate().equals(s2.getPredicate())) {
       term1 = RDFStatement.make(s1, s1.getSubject(), var1);
       term2 = RDFStatement.make(s2, s2.getSubject(), var2);
     }
   } else { // to generalize
     Term condition;
     if ((term1 instanceof Implication) && (term2 instanceof Inheritance)) {
       condition = ((Implication) term1).getSubject();
       if (condition.equals(term2)) {
         return;
       }
       if ((condition instanceof Conjunction)
           && ((Conjunction) condition).containComponent(term2)) {
         return;
       }
     } else if ((term1 instanceof Inheritance) && (term2 instanceof Implication)) {
       condition = ((Implication) term2).getSubject();
       if (condition.equals(term1)) {
         return;
       }
       if ((condition instanceof Conjunction)
           && ((Conjunction) condition).containComponent(term1)) {
         return;
       }
     }
   }
   RDFStatement statement1 = Implication.make(term1, term2, order);
   RDFStatement statement2 = Implication.make(term2, term1, TemporalValue.getReverse(order));
   RDFStatement statement3 = Equivalence.make(term1, term2, order);
   TruthValue value1 = judg1.getTruth();
   TruthValue value2 = judg2.getTruth();
   TruthValue truth1 = TruthFunctions.induction(value1, value2);
   TruthValue truth2 = TruthFunctions.induction(value2, value1);
   TruthValue truth3 = TruthFunctions.comparison(value1, value2);
   BudgetValue budget1 =
       BudgetFunctions.temporalIndCom(task1.getBudget(), task2.getBudget(), truth1);
   BudgetValue budget2 =
       BudgetFunctions.temporalIndCom(task1.getBudget(), task2.getBudget(), truth2);
   BudgetValue budget3 =
       BudgetFunctions.temporalIndCom(task1.getBudget(), task2.getBudget(), truth3);
   Memory.currentTense = new TemporalValue(0);
   Memory.doublePremiseTask(budget1, statement1, truth1);
   Memory.doublePremiseTask(budget2, statement2, truth2);
   Memory.doublePremiseTask(budget3, statement3, truth3);
 }
示例#7
0
 /**
  * {<M --> S>, <C ==> <M --> P>>} |- <(&&, <#x --> S>, C) ==> <#x --> P>> {<M --> S>, (&&, C, <M
  * --> P>)} |- (&&, C, <<#x --> S> ==> <#x --> P>>)
  *
  * @param premise1 The first premise directly used in internal induction, <M --> S>
  * @param premise2 The component to be used as a premise in internal induction, <M --> P>
  * @param oldCompound The whole content of the first premise, Implication or Conjunction
  */
 static void introVarIndInner(
     RDFStatement premise1, RDFStatement premise2, CompoundTerm oldCompound) {
   Task task = Memory.currentTask;
   Sentence taskSentence = task.getSentence();
   if (!taskSentence.isJudgment()) {
     return;
   }
   if (premise1.getClass() != premise2.getClass()) {
     return;
   }
   Variable var1 = new Variable(Symbols.VARIABLE_TAG + "0");
   Variable var2 = new Variable(Symbols.VARIABLE_TAG + "0");
   RDFStatement state1, state2;
   if (premise1.getSubject().equals(premise2.getSubject())) {
     state1 = RDFStatement.make(premise1, var1, premise1.getPredicate());
     state2 = RDFStatement.make(premise2, var2, premise2.getPredicate());
   } else if (premise1.getPredicate().equals(premise2.getPredicate())) {
     state1 = RDFStatement.make(premise1, premise1.getSubject(), var1);
     state2 = RDFStatement.make(premise2, premise2.getSubject(), var2);
   } else {
     return;
   }
   Sentence belief = Memory.currentBelief;
   Term compound, content;
   TemporalValue tense;
   TruthValue truth;
   if (premise1.equals(taskSentence.getContent())) {
     truth = TruthFunctions.abduction(taskSentence.getTruth(), belief.getTruth());
     tense = TemporalRules.tenseInduction(taskSentence.getTense(), belief.getTense());
   } else {
     truth = TruthFunctions.abduction(belief.getTruth(), taskSentence.getTruth());
     tense = TemporalRules.tenseInduction(belief.getTense(), taskSentence.getTense());
   }
   if (tense == null) {
     return;
   }
   if ((oldCompound instanceof Implication) && (tense == oldCompound.getOrder())) {
     compound = RDFStatement.make((RDFStatement) oldCompound, oldCompound.componentAt(0), state2);
     content = RDFStatement.make((RDFStatement) oldCompound, state1, compound);
   } else if (oldCompound instanceof Conjunction) {
     compound = Implication.make(state1, state2, tense);
     content = CompoundTerm.replaceComponent(oldCompound, premise2, compound);
   } else {
     return;
   }
   BudgetValue budget = BudgetFunctions.forward(truth);
   Memory.doublePremiseTask(budget, content, truth);
 }
示例#8
0
 /**
  * {<(&&, S2, S3) ==> P>, <(&&, S1, S3) ==> P>} |- <S1 ==> S2>
  *
  * @param cond1 The condition of the first premise
  * @param cond2 The condition of the second premise
  * @param st1 The first premise
  * @param st2 The second premise
  * @return Whether there are derived tasks
  */
 static boolean conditionalAbd(Term cond1, Term cond2, RDFStatement st1, RDFStatement st2) {
   if (!(st1 instanceof Implication) || !(st2 instanceof Implication)) {
     return false;
   }
   if (!(cond1 instanceof Conjunction) && !(cond2 instanceof Conjunction)) {
     return false;
   }
   TemporalValue order1 = st1.getOrder();
   TemporalValue order2 = st2.getOrder();
   if (order1 != order2) {
     return false;
   }
   Term term1 = null;
   Term term2 = null;
   if (cond1 instanceof Conjunction) {
     term1 = CompoundTerm.reduceComponents((Conjunction) cond1, cond2);
   }
   if (cond2 instanceof Conjunction) {
     term2 = CompoundTerm.reduceComponents((Conjunction) cond2, cond1);
   }
   if ((term1 == null) && (term2 == null)) {
     return false;
   }
   Task task = Memory.currentTask;
   Sentence sentence = task.getSentence();
   Judgment belief = Memory.currentBelief;
   TruthValue value1 = sentence.getTruth();
   TruthValue value2 = belief.getTruth();
   boolean keepOrder =
       (Variable.findSubstitute(Variable.VarType.INDEPENDENT, st1, task.getContent()) != null);
   Term content;
   TruthValue truth = null;
   BudgetValue budget;
   if (term1 != null) {
     if (term2 != null) {
       content = RDFStatement.make(st2, term2, term1, order2);
     } else {
       content = term1;
     }
     if (sentence instanceof Question) {
       budget = BudgetFunctions.backwardWeak(value2);
     } else {
       if (sentence instanceof Goal) {
         if (keepOrder) {
           truth = TruthFunctions.desireDed(value1, value2);
         } else {
           truth = TruthFunctions.desireInd(value1, value2);
         }
       } else {
         truth = TruthFunctions.abduction(value2, value1);
       }
       budget = BudgetFunctions.forward(truth);
     }
     Memory.doublePremiseTask(budget, content, truth);
   }
   if (term2 != null) {
     if (term1 != null) {
       content = RDFStatement.make(st1, term1, term2, order1);
     } else {
       content = term2;
     }
     if (sentence instanceof Question) {
       budget = BudgetFunctions.backwardWeak(value2);
     } else {
       if (sentence instanceof Goal) {
         if (keepOrder) {
           truth = TruthFunctions.desireDed(value1, value2);
         } else {
           truth = TruthFunctions.desireInd(value1, value2);
         }
       } else {
         truth = TruthFunctions.abduction(value1, value2);
       }
       budget = BudgetFunctions.forward(truth);
     }
     Memory.currentTense = null;
     Memory.doublePremiseTask(budget, content, truth);
   }
   return true;
 }
示例#9
0
 /**
  * {<(&&, S1, S2, S3) ==> P>, S1} |- <(&&, S2, S3) ==> P> {<(&&, S2, S3) ==> P>, <S1 ==> S2>} |-
  * <(&&, S1, S3) ==> P> {<(&&, S1, S3) ==> P>, <S1 ==> S2>} |- <(&&, S2, S3) ==> P>
  *
  * @param premise1 The conditional premise
  * @param index The location of the shared term in the condition of premise1
  * @param premise2 The premise which, or part of which, appears in the condition of premise1
  * @param side The location of the shared term in premise2: 0 for subject, 1 for predicate, -1 for
  *     the whole term
  */
 static void conditionalDedInd(Implication premise1, short index, Term premise2, int side) {
   Task task = Memory.currentTask;
   Sentence taskSentence = task.getSentence();
   Judgment belief = Memory.currentBelief;
   boolean deduction = (side != 0);
   HashMap substitute =
       Variable.findSubstitute(Variable.VarType.ALL, premise2, belief.getContent());
   boolean conditionalTask = (substitute != null);
   TemporalValue tense1 = (conditionalTask ? taskSentence.getTense() : belief.getTense());
   TemporalValue tense2 = (conditionalTask ? belief.getTense() : taskSentence.getTense());
   TemporalValue order1 = premise1.getOrder();
   TemporalValue order2 = premise2.getOrder();
   if ((side == -1) && (tense2 != null) && (tense2.getDelta() > 0)) {
     return;
   }
   if ((side == 0) && (order2 != null) && (order2.getDelta() > 0)) {
     return;
   }
   if ((side == 1) && (order2 != null) && (order2.getDelta() < 0)) {
     return;
   }
   TemporalValue tense = TemporalRules.syllogistic(tense1, tense2);
   if (tense != null) {
     tense = new TemporalValue(0);
   }
   Term commonComponent;
   Term newComponent = null;
   if (side == 0) {
     commonComponent = ((RDFStatement) premise2).getSubject();
     newComponent = ((RDFStatement) premise2).getPredicate();
   } else if (side == 1) {
     commonComponent = ((RDFStatement) premise2).getPredicate();
     newComponent = ((RDFStatement) premise2).getSubject();
   } else {
     commonComponent = premise2;
   }
   Conjunction oldCondition = (Conjunction) premise1.getSubject();
   boolean match =
       Variable.unify(
           Variable.VarType.INDEPENDENT,
           oldCondition.componentAt(index),
           commonComponent,
           premise1,
           premise2);
   if (!match && (commonComponent.getClass() == oldCondition.getClass())) {
     match =
         Variable.unify(
             Variable.VarType.INDEPENDENT,
             oldCondition.componentAt(index),
             ((CompoundTerm) commonComponent).componentAt(index),
             premise1,
             premise2);
   }
   if (!match) {
     return;
   }
   Term newCondition;
   if (oldCondition.equals(commonComponent)) {
     newCondition = null;
   } else {
     newCondition = CompoundTerm.replaceComponent(oldCondition, index, newComponent);
     if ((newCondition instanceof Conjunction) && ((CompoundTerm) newCondition).size() == 1) {
       newCondition = ((CompoundTerm) newCondition).componentAt(0);
     }
   }
   Term content;
   if (newCondition != null) {
     content = RDFStatement.make(premise1, newCondition, premise1.getPredicate(), order1);
   } else {
     content = premise1.getPredicate();
   }
   if (content == null) {
     return;
   }
   TruthValue truth1 = taskSentence.getTruth();
   TruthValue truth2 = belief.getTruth();
   TruthValue truth = null;
   BudgetValue budget;
   if (taskSentence instanceof Question) {
     budget = BudgetFunctions.backwardWeak(truth2);
   } else {
     if (taskSentence instanceof Goal) {
       if (conditionalTask) {
         truth = TruthFunctions.desireWeak(truth1, truth2);
       } else if (deduction) {
         truth = TruthFunctions.desireInd(truth1, truth2);
       } else {
         truth = TruthFunctions.desireDed(truth1, truth2);
       }
       budget = BudgetFunctions.forward(truth);
     } else {
       if (deduction) {
         truth = TruthFunctions.deduction(truth1, truth2);
       } else if (conditionalTask) {
         truth = TruthFunctions.induction(truth2, truth1);
       } else {
         truth = TruthFunctions.induction(truth1, truth2);
       }
     }
     budget = BudgetFunctions.forward(truth);
   }
   Memory.currentTense = tense;
   Memory.doublePremiseTask(budget, content, truth);
 }
示例#10
0
 /**
  * {<<M --> S> ==> <M --> P>>, <M --> S>} |- <M --> P> {<<M --> S> ==> <M --> P>>, <M --> P>} |-
  * <M --> S>
  *
  * @param mainSentence The implication/equivalence premise
  * @param subSentence The premise on part of s1
  * @param s The location of s2 in s1
  */
 static void detachment(Sentence mainSentence, Sentence subSentence, int s) {
   RDFStatement statement = (RDFStatement) mainSentence.getContent();
   Term subject = statement.getSubject();
   Term predicate = statement.getPredicate();
   Term term = subSentence.getContent();
   Term content;
   int side;
   if (term.equals(subject)) {
     side = 0;
     content = predicate;
   } else if (term.equals(predicate)) {
     side = 1;
     content = subject;
   } else {
     return;
   }
   if ((content instanceof RDFStatement) && ((RDFStatement) content).invalid()) {
     return;
   }
   Sentence taskSentence = Memory.currentTask.getSentence();
   Sentence beliefSentence = Memory.currentBelief;
   TruthValue beliefTruth = beliefSentence.getTruth();
   TruthValue truth1 = mainSentence.getTruth();
   TruthValue truth2 = subSentence.getTruth();
   TruthValue truth = null;
   BudgetValue budget;
   if (taskSentence instanceof Question) {
     if (statement instanceof Equivalence) {
       budget = BudgetFunctions.backward(beliefTruth);
     } else if (side == 0) {
       budget = BudgetFunctions.backwardWeak(beliefTruth);
     } else {
       budget = BudgetFunctions.backward(beliefTruth);
     }
   } else {
     if (taskSentence instanceof Goal) {
       if (statement instanceof Equivalence) {
         truth = TruthFunctions.desireStrong(truth1, truth2);
       } else if (side == 0) {
         truth = TruthFunctions.desireInd(truth1, truth2);
       } else {
         truth = TruthFunctions.desireDed(truth1, truth2);
       }
     } else {
       if (statement instanceof Equivalence) {
         truth = TruthFunctions.analogy(truth1, truth2);
       } else if (side == 0) {
         truth = TruthFunctions.deduction(truth1, truth2);
       } else {
         truth = TruthFunctions.abduction(truth2, truth1);
       }
     }
     budget = BudgetFunctions.forward(truth);
   }
   TemporalValue tense0 = subSentence.getTense();
   TemporalValue order0 = statement.getOrder();
   TemporalValue tense;
   if (order0 == null) {
     tense = tense0;
   } else if (side == 0) {
     tense = TemporalRules.tenseSyllogistic(tense0, subSentence.getCreationTime(), order0);
   } else {
     tense =
         TemporalRules.tenseSyllogistic(
             tense0, subSentence.getCreationTime(), TemporalValue.getReverse(order0));
   }
   Memory.currentTense = tense;
   Memory.doublePremiseTask(budget, content, truth);
 }