Examples with Implication nars.language.Implication used on opensource projects

Example 11 with Implication

use of nars.language.Implication in project opennars by opennars.

the class RuleTables method conditionalDedIndWithVar.

/**
 * Conditional deduction or induction, with variable unification
 *
 * @param conditional The premise that is an Implication with a Conjunction
 * as condition
 * @param index The location of the shared term in the condition
 * @param statement The second premise that is a statement
 * @param side The location of the shared term in the statement
 * @param nal Reference to the memory
 */
private static void conditionalDedIndWithVar(Sentence conditionalSentence, Implication conditional, short index, Statement statement, short side, DerivationContext nal) {
    if (!(conditional.getSubject() instanceof CompoundTerm))
        return;
    CompoundTerm condition = (CompoundTerm) conditional.getSubject();
    if (condition instanceof Conjunction) {
        // conditionalDedIndWithVar
        for (Term t : condition.term) {
            // does not support the case where
            if (t instanceof Variable) {
                // (this can happen since we have # due to image transform,
                return;
            }
        // although not for other conjunctions)
        }
    }
    Term component = condition.term[index];
    Term component2 = null;
    if (statement instanceof Inheritance) {
        component2 = statement;
        side = -1;
    } else if (statement instanceof Implication) {
        component2 = statement.term[side];
    }
    if (component2 != null) {
        Term[] u = new Term[] { conditional, statement };
        if (Variables.unify(VAR_INDEPENDENT, component, component2, u)) {
            conditional = (Implication) u[0];
            statement = (Statement) u[1];
            SyllogisticRules.conditionalDedInd(conditionalSentence, conditional, index, statement, side, nal);
        }
    }
}

Example 12 with Implication

use of nars.language.Implication in project opennars by opennars.

the class RuleTables method syllogisms.

/* ----- syllogistic inferences ----- */
/**
 * Meta-table of syllogistic rules, indexed by the content classes of the
 * taskSentence and the belief
 *
 * @param tLink The link to task
 * @param bLink The link to belief
 * @param taskTerm The content of task
 * @param beliefTerm The content of belief
 * @param nal Reference to the memory
 */
private static void syllogisms(TaskLink tLink, TermLink bLink, Term taskTerm, Term beliefTerm, DerivationContext nal) {
    Sentence taskSentence = nal.getCurrentTask().sentence;
    Sentence belief = nal.getCurrentBelief();
    int figure;
    if (taskTerm instanceof Inheritance) {
        if (beliefTerm instanceof Inheritance) {
            figure = indexToFigure(tLink, bLink);
            asymmetricAsymmetric(taskSentence, belief, figure, nal);
        } else if (beliefTerm instanceof Similarity) {
            figure = indexToFigure(tLink, bLink);
            asymmetricSymmetric(taskSentence, belief, figure, nal);
        } else {
            detachmentWithVar(belief, taskSentence, bLink.getIndex(0), nal);
        }
    } else if (taskTerm instanceof Similarity) {
        if (beliefTerm instanceof Inheritance) {
            figure = indexToFigure(bLink, tLink);
            asymmetricSymmetric(belief, taskSentence, figure, nal);
        } else if (beliefTerm instanceof Similarity) {
            figure = indexToFigure(bLink, tLink);
            symmetricSymmetric(belief, taskSentence, figure, nal);
        } else if (beliefTerm instanceof Implication) {
            // Bridge to higher order statements:
            figure = indexToFigure(tLink, bLink);
            asymmetricSymmetric(belief, taskSentence, figure, nal);
        } else if (beliefTerm instanceof Equivalence) {
            // Bridge to higher order statements:
            figure = indexToFigure(tLink, bLink);
            symmetricSymmetric(belief, taskSentence, figure, nal);
        }
    } else if (taskTerm instanceof Implication) {
        if (beliefTerm instanceof Implication) {
            figure = indexToFigure(tLink, bLink);
            asymmetricAsymmetric(taskSentence, belief, figure, nal);
        } else if (beliefTerm instanceof Equivalence) {
            figure = indexToFigure(tLink, bLink);
            asymmetricSymmetric(taskSentence, belief, figure, nal);
        } else if (beliefTerm instanceof Inheritance) {
            detachmentWithVar(taskSentence, belief, tLink.getIndex(0), nal);
        } else if (beliefTerm instanceof Similarity) {
            // Bridge to higher order statements:
            figure = indexToFigure(tLink, bLink);
            asymmetricSymmetric(taskSentence, belief, figure, nal);
        }
    } else if (taskTerm instanceof Equivalence) {
        if (beliefTerm instanceof Implication) {
            figure = indexToFigure(bLink, tLink);
            asymmetricSymmetric(belief, taskSentence, figure, nal);
        } else if (beliefTerm instanceof Equivalence) {
            figure = indexToFigure(bLink, tLink);
            symmetricSymmetric(belief, taskSentence, figure, nal);
        } else if (beliefTerm instanceof Inheritance) {
            detachmentWithVar(taskSentence, belief, tLink.getIndex(0), nal);
        } else if (beliefTerm instanceof Similarity) {
            // Bridge to higher order statements:
            figure = indexToFigure(tLink, bLink);
            symmetricSymmetric(belief, taskSentence, figure, nal);
        }
    }
}

Example 13 with Implication

use of nars.language.Implication in project opennars by opennars.

the class RuleTables method transformTask.

/* ----- inference with one TaskLink only ----- */
/**
 * The TaskLink is of type TRANSFORM, and the conclusion is an equivalent
 * transformation
 *
 * @param tLink The task link
 * @param nal Reference to the memory
 */
public static void transformTask(TaskLink tLink, DerivationContext nal) {
    CompoundTerm content = (CompoundTerm) nal.getCurrentTask().getTerm();
    short[] indices = tLink.index;
    Term inh = null;
    if ((indices.length == 2) || (content instanceof Inheritance)) {
        // <(*, term, #) --> #>
        inh = content;
    } else if (indices.length == 3) {
        // <<(*, term, #) --> #> ==> #>
        inh = content.term[indices[0]];
    } else if (indices.length == 4) {
        // <(&&, <(*, term, #) --> #>, #) ==> #>
        Term component = content.term[indices[0]];
        if ((component instanceof Conjunction) && (((content instanceof Implication) && (indices[0] == 0)) || (content instanceof Equivalence))) {
            Term[] cterms = ((CompoundTerm) component).term;
            if (indices[1] < cterms.length - 1) {
                inh = cterms[indices[1]];
            } else {
                return;
            }
        } else {
            return;
        }
    }
    if (inh instanceof Inheritance) {
        StructuralRules.transformProductImage((Inheritance) inh, content, indices, nal);
    }
}

Example 14 with Implication

use of nars.language.Implication in project opennars by opennars.

the class RuleTables method goalFromQuestion.

private static void goalFromQuestion(final Task task, final Term taskTerm, final DerivationContext nal) {
    if (task.sentence.punctuation == Symbols.QUESTION_MARK && (taskTerm instanceof Implication || taskTerm instanceof Equivalence)) {
        // <a =/> b>? |- a!
        Term goalterm = null;
        Term goalterm2 = null;
        if (taskTerm instanceof Implication) {
            Implication imp = (Implication) taskTerm;
            if (imp.getTemporalOrder() != TemporalRules.ORDER_BACKWARD || imp.getTemporalOrder() == TemporalRules.ORDER_CONCURRENT) {
                if (!Parameters.CURIOSITY_FOR_OPERATOR_ONLY || imp.getSubject() instanceof Operation) {
                    goalterm = imp.getSubject();
                }
                if (goalterm instanceof Variable && goalterm.hasVarQuery() && (!Parameters.CURIOSITY_FOR_OPERATOR_ONLY || imp.getPredicate() instanceof Operation)) {
                    // overwrite, it is a how question, in case of <?how =/> b> it is b! which is desired
                    goalterm = imp.getPredicate();
                }
            } else if (imp.getTemporalOrder() == TemporalRules.ORDER_BACKWARD) {
                if (!Parameters.CURIOSITY_FOR_OPERATOR_ONLY || imp.getPredicate() instanceof Operation) {
                    goalterm = imp.getPredicate();
                }
                if (goalterm instanceof Variable && goalterm.hasVarQuery() && (!Parameters.CURIOSITY_FOR_OPERATOR_ONLY || imp.getSubject() instanceof Operation)) {
                    // overwrite, it is a how question, in case of <?how =/> b> it is b! which is desired
                    goalterm = imp.getSubject();
                }
            }
        } else if (taskTerm instanceof Equivalence) {
            Equivalence qu = (Equivalence) taskTerm;
            if (qu.getTemporalOrder() == TemporalRules.ORDER_FORWARD || qu.getTemporalOrder() == TemporalRules.ORDER_CONCURRENT) {
                if (!Parameters.CURIOSITY_FOR_OPERATOR_ONLY || qu.getSubject() instanceof Operation) {
                    goalterm = qu.getSubject();
                }
                if (!Parameters.CURIOSITY_FOR_OPERATOR_ONLY || qu.getPredicate() instanceof Operation) {
                    goalterm2 = qu.getPredicate();
                }
            }
        }
        TruthValue truth = new TruthValue(1.0f, Parameters.DEFAULT_GOAL_CONFIDENCE * Parameters.CURIOSITY_DESIRE_CONFIDENCE_MUL);
        if (goalterm != null && !(goalterm instanceof Variable) && goalterm instanceof CompoundTerm) {
            goalterm = ((CompoundTerm) goalterm).transformIndependentVariableToDependentVar((CompoundTerm) goalterm);
            Sentence sent = new Sentence(goalterm, Symbols.GOAL_MARK, truth, new Stamp(task.sentence.stamp, nal.memory.time()));
            nal.singlePremiseTask(sent, new BudgetValue(task.getPriority() * Parameters.CURIOSITY_DESIRE_PRIORITY_MUL, task.getDurability() * Parameters.CURIOSITY_DESIRE_DURABILITY_MUL, BudgetFunctions.truthToQuality(truth)));
        }
        if (goalterm2 != null && !(goalterm2 instanceof Variable) && goalterm2 instanceof CompoundTerm) {
            goalterm2 = ((CompoundTerm) goalterm).transformIndependentVariableToDependentVar((CompoundTerm) goalterm2);
            Sentence sent = new Sentence(goalterm2, Symbols.GOAL_MARK, truth.clone(), new Stamp(task.sentence.stamp, nal.memory.time()));
            nal.singlePremiseTask(sent, new BudgetValue(task.getPriority() * Parameters.CURIOSITY_DESIRE_PRIORITY_MUL, task.getDurability() * Parameters.CURIOSITY_DESIRE_DURABILITY_MUL, BudgetFunctions.truthToQuality(truth)));
        }
    }
}

Example 15 with Implication

use of nars.language.Implication in project opennars by opennars.

the class StructuralRules method contraposition.

/**
 * {<A ==> B>, A@(--, A)} |- <(--, B) ==> (--, A)>
 *
 * @param statement The premise
 * @param memory Reference to the memory
 */
protected static boolean contraposition(final Statement statement, final Sentence sentence, final DerivationContext nal) {
    Memory memory = nal.mem();
    // memory.logic.CONTRAPOSITION.commit(statement.complexity);
    Term subj = statement.getSubject();
    Term pred = statement.getPredicate();
    Statement content = Statement.make(statement, Negation.make(pred), Negation.make(subj), TemporalRules.reverseOrder(statement.getTemporalOrder()));
    if (content == null)
        return false;
    TruthValue truth = sentence.truth;
    BudgetValue budget;
    if (sentence.isQuestion() || sentence.isQuest()) {
        if (content instanceof Implication) {
            budget = BudgetFunctions.compoundBackwardWeak(content, nal);
        } else {
            budget = BudgetFunctions.compoundBackward(content, nal);
        }
        return nal.singlePremiseTask(content, Symbols.QUESTION_MARK, truth, budget);
    } else {
        if (content instanceof Implication) {
            truth = TruthFunctions.contraposition(truth);
        }
        budget = BudgetFunctions.compoundForward(truth, content, nal);
        return nal.singlePremiseTask(content, Symbols.JUDGMENT_MARK, truth, budget);
    }
}