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Predicate Calculus Examples :

Ex1 : It rained on Tuesday . weather(tuesday , rain)

Ex2 : It rained every days. weather(X , rain) ( day(X)

Ex3 : mother(layla, adel) mother(layla, suha) father(adam, adel) father(adam, suha)

(X(Y father(X,Y) ( mother(X,Y) ( parent(X,Y) (X(Y(Z parent(X,Y) ( parent(X,Z) ( brother(Y,Z)

In this example we use the predicate mother and father to define a set of other relationships such as parent and brother.

Predicate calculus semantics : provide a formal basis for determining the truth value of Well Formed Formula (WFF) . The truth of expressions depends on the mapping of constants, variables and functions into objects and relation in the domain of discourse.

First order predicate Calculus : It is a language allows quantified variables to refer to objects in the domain of discourse and not to predicates or functions.

Ex3 : if it doesn't rain tomorrow . Tom will go to the mountains. ~weather(rain, tomorrow) ( go (tom, mountains)

Ex4 : All person play football are tall (X(Y (person(X) ^ play(X,Y) ^ football(Y) ( tall(X)

Ex5 : some person like anchovies. (X (person(X) ^ like (X, anchovies)).

Ex6 : No body likes taxes. ~ (X likes(X, taxes) or (X ~likes(X, taxes).

Ex7 : Suppose we want to model the blocks world of figure below to design a control algorithm for a robot arm :

on (c, a). on (b, d). on-table ( a ) on-table ( d ) clear ( b ) % nothing above b clear ( c ) % nothing above c hand-empty. % free hand

A block world with it is predicate calculus description.
- To pick up a block and stack it on another block, both blocks must be clear. In figure above , block [a] is not clear.
- Because the arm can move blocks , it can change the state of the world and clear a block. The following rule describes when a block is clear :

(X(~(Y on(Y,X) ( clear(X)).

That is , for all X , X is clear if there does not exist Y such that Y is on X.

- Besides using implication to define when a block is clear , other rules may be added that describe operations such as stacking an block on another.

For example : to stack X on Y first empty the hand, then clear Y, then clear X, and then pick-on X. and put-down X on Y.

(X(Y (( hand-empty ^ clear(X) ^ clear(Y) ^ pick-up(X) ^ put-down(X,Y) ( stack (X,Y))

Hand-empty pick-up(X) put-down(X,Y) Clear(x) Clear(y)

Ex8 : Every person who get married and have at least a child is called father

(X(married(X) ^ have (X, child) ( father(X))

Ex9 : John didn't study but is lucky. ~ study (john) ^ lucky(john)

Ex10 : Any one who studies or is lucky can pass all their exams. (X(Y(study(X) v lucky(X) ( pass(X,Y) ^ exam(Y)

Ex11 : Any one passing their exams and winning the lottery is happy. (X(pass(X, exams) ^ win (X, lottery) ( happy(X))

Ex12 : Any one who is lucky win the lottery. (X(lucky(X) ( win(X, lottery).

Using inference Rules to produce predicate Calculus Expression : The semantic of predicate calculus provide a basis for a formal theory of logical inference. The ability to infer new correct expansions from a set of true assertions is an important feature of predicate calculus.

S : (X human(X) ( mortal (X)

An inference rule is essentially a mechanical means of producing new predicate calculus sentences from other sentences. That is, inference rules produce new sentences based on the syntactic from a given logical assertions.

Modus Ponens : Is a sound inference rule. If we are given an expression of the form P(Q and another expression of the form P such that both are true under an interpretation, Modus Ponens allows to infer that Q is true for that interpretation.
P(Q true
P true
Q true

Modus Tolens : If P(Q is know to be true and Q is know to be false we can infer ~P.

P(Q True Q False ~P A simple example of the use of Modus Ponens is the propositional calculus , assume the following observation : if "it is raining" then "the ground will be wet"
And "it is raining" if P denotes " it is raining" and Q is "the ground is wet" P(Q True P True Q

Through an application of Modus Ponens , the fact that the ground is wet (Q) may be added to the set of true expression.
- Modus Ponens can also be applied to the expression containing variables. For example .

" All men are mortal and Socrates is a man";

Therefore Socrates is mortal.

(X(man(X) ( mortal (X)). man(Socrates) mortal(Socrates)

Because the X in the implication is universal quantified, may substitution any value in the domain for X and still have a true statement under the inference rule of universal institution. By substituting Socrates for X in the implication, we infer the expression: man(Socrates) ( mortal(Socrates).
Production Systems : Is one of the oldest techniques of knowledge representation. Production system consist of a set of production rules, a working memory , and a recognize-act control cycle.

1- The Set of Production Rules : These are often simply called productions.
A productions is a condition, action pair and defines a single chunk of problem-solving knowledge. The condition part of rule is a pattern that determines what the rule may applied to a problem instance. The action part defines the associated problem-solving step.
Example :
PR1 : if (person age above -21) & (person wife nil) & (person sex male) then (person eligible for marriage)

2- Working Memory : The working memory (WM) generally holds data either in the form of clauses or object- attribute – value (OAV) triplet form. The variables in condition part are matched against the data items of the WN. In cases all the variable instantiation of the condition parts of a rules are consistent, then the rule is fired and the new consequents are added to the WM and some old data of WM, Which are no longer needed, are deleted from the WM to minimize the search time required for matching the condition parts of a rule with the data in WM.

Example for Production System :
The 8-Puzzle

Start Goal

Production Set : Condition Action Goal state in working memory ( stop Blank is not on the top edge ( move the blank up Blank is not on the right edge ( move the blank right Blank is not on the bottom edge ( move the blank down Blank is not on the left edge ( move the blank left Working memory is the present board state and goal state.
Control Recognize : 1- Try each production in order. 2- Do not allow loops. 3- Stop when goal is found.
-----------------------
d

a

c

b

Free - hand

Table

Y

X

X

Y

X

Y

(1)

(2)

(3)

2 8 3 1 6 4 7 X 5

1 2 3 8 X 4 7 6 5

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