ࡱ> vxstu` objbj 7#zzz8<l**@@@& )0222222$hibVz;N;;V@@iO;J@z@0;0h z4@ Poc`le0pc 44\z10a"111VVij111;;;;du5 Geometry Week 9 Sec 5.3 and 5.4 section 5.3 To reason to a correct conclusion, we must build our arguments on true statements. Sometimes it is helpful to use truth tables. Simple Truth Table p(pTFFT Conjunctions Look at: A cat is a mammal and a snake is a fish. Questions: Is this true or false? False Why is the statement false? Both parts must be true for the statement to be true because of the word and. Definition: A conjunction is a statement in which two statements, p and q, are connected by and. The notation for the conjunction p and q is denoted p v q. p: A cat is a mammal. q: A snake is a fish. p v q: A cat is a mammal and a snake is a fish. pqp v q**In order for aTTTconjunction to beTFFtrue, both p and qFTFmust be true.FFF Disjunctions Look at: A cat is a mammal or a snake is a fish. Questions: Is this true or false? True Why is the statement false? Only one part must be true for the entire statement to be considered true. Definition: A disjunction is a statement in which two statements, p and q, are connected by or. The notation for the disjunction p or q is denoted p w q. p: A cat is a mammal. q: A snake is a fish. p w q: A cat is a mammal or a snake is a fish. pqp w q**Only one of the TTTstatements of a TFTdisjunction needs to FTTbe true for the FFFdisjunction to be true. Sample Problems: Determine whether the statements are true or false. 1. The president is Al Gore. false 2. Bicycle gears require oil and a coolant. false 3. The St. Croix or the Mississippi runs through Minnesota. true 4. Brown is neither a primary nor a secondary color. true Note: Nor is not the same as or but it is the same as and. Sample Problems: Classify each as a conjunction or disjunction and determine the falsity. 1. Presidents Reagan and Clinton were Republicans. conjunction, false 2. Bret Favre or Joe Mauer is a baseball player. disjunction, true 3. Regular polygons are equiangular and equilateral. conjunction, true 4. Two lines are parallel or they intersect. disjunction, false Make a truth table for (p v r) w (q v (r) Dogs and cats are mammals, or horses are mammals and cats are not mammals. pqr(p v r)(r(q v (r)(p v r) w (q v (r)TTTTTFTFTTFFFTTFTFFFTFFF Answer: pqr(p v r)(r(q v (r)(p v r) w (q v (r)TTTTFFTTTFFTTTTFTTFFTTFFFTFFFTTFFFFFTFFTTTFFTFFFFFFFFTFF **Note: If there are n statements, there are 2n possible combinations. For 3 statements as we have here, there are 23 = 8 combinations. Make a truth table for ( s w (s v t) st( ss v t( s w (s v t)TTTFFTFF Answer: st( ss v t( s w (s v t)TTFTTTFFFFFTTFTFFTFT Make a truth table for ((p v q) v r pqr(p((p v q)((p v q) v rTTTTTFTFTTFFFTTFTFFFTFFFAnswer: pqr(p((p v q)((p v q) v rTTTFFFTTFFFFTFTFFFTFFFFFFTTTTTFTFTTFFFTTFFFFFTFF Note: 1ST column use 4 Ts and then 4 Fs. 2nd column use 2 Ts, and 2 Fs. 3rd column use 1 T and 1 F, etc. The solutions will have the problems in this form. section 5.4 Conditional Statements: Look at: If the sun is shining, then it is daytime. Let p: The sun is shining. Let q: It is daytime. Then this statement translates to If p, then q. Definition: A conditional statement is a statement of the form  If p, then q, where p and q are statements. The notation for this conditional statement is p ! q. p is the  if statement and is called the hypothesis q is the  then statement and is called the conclusion Sample Problems: Write the following in if-then form: 1. There are no clouds in the sky, so it is not raining. If there are no clouds in the sky, then it is not raining. 2. CHAT will be cancelled if a blizzard hits. If a blizzard hits, then CHAT will be cancelled. 3. It will be warm tomorrow if it does not rain. If it does not rain, then it will be warm tomorrow. 4. When you water your plants, they grow. If you water your plants, then they will grow. 5. Satisfaction guaranteed or your money back. If you are not satisfied, then you will get your money back. Example: TJ says, If I ace this geometry test, then Ill take the entire class for pizza. Let p: TJ aces the geometry test. Let q: TJ takes the entire class out for pizza. p ! q: If TJ aces the geometry test, then he will take the entire class out for pizza. Determine the truth table values: Case 1: Both p and q are true. TJ aces the test and he takes the class out for pizza. ( TJ told the truth when he made the conditional statement. True ! True is true Case 2: p is true and q is false TJ aces the test but doesn t take the class for pizza. ( TJ lied and True ! False is false Case 3: p is false and q is true TJ doesn t ace the test but still takes the class out for pizza. ( TJ didn t lie when he made his conditional statement, since nothing was said about what he would do if he didn t ace the test. False ! True is true Case 4: Both p and q are false. TJ doesn t ace the test and he doesn t take the class for pizza. ( TJ didn t lie when he made his conditional statement. False ! False is true ***In general, the only time the conditional statement is false is if the hypothesis is true, but the conclusion is false. Truth Table for a Conditional Statement pqp!qTTTTFFFTTFFTImplications  If p, then q is sometimes written  p implies q Definition: A conditional statement that is always true is called an implication. Example: if-then: If it is raining, then there are clouds in the sky. implication: The fact that it is raining implies that there are clouds in the sky. Biconditional Statements Look at: p: The sun is shining. q: There are no clouds in the sky today. p!q: If the sun is shining, then there are no clouds in the sky today. q!p: If there are no clouds in the sky today, then the sun is shining. ***If both p!q is true, and q!p is true, we call this a biconditional statement. Definition: A biconditional statement is a statement of the form  p if and only if q which means p!q and q!p, and is symbolized by p!q. We would say: The sun is shining if and only if there are no clouds in the sky today. ***When proving a biconditional statement, you must prove both p!q and q!p. Truth Table for Biconditional Statements pqp!qq!p(p!q) v (q!p)TTTTTTFFTFFTTFFFFTTT ***A biconditional statement is only true if p and q have the same truth values. 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Theorem 5.1: The conditional statement p!q is equivalent to the disjunction (p or q. Truth Table showing equivalence: pqp!q(p(p w q(p!q) ! ((p w q)TTTFTTTFFFFTFTTTTTFFTTTT  This theorem allows us to substitute a disjunction for a conditional and vice versa. Any time we have equivalent expressions, they can be substituted for each other. Sample Problems: Change the following conditional statements to disjunctions. 1. If a batter has 3 strikes, then he is out. A better doesnt have 3 strikes, or he is out. 2. If it is raining, then there are clouds in the sky. It is not raining, or there are clouds in the sky. 3. If a student goes to college, then he will become more educated. A student doesn t go to college, or he becomes more educated. Definitions: The converse of a conditional statement is obtained by switching the hypothesis and conclusion. The converse of p!q is q!p. The inverse of a conditional statement is obtained by negating both the hypothesis and conclusion. The inverse of p!q is (p!(q. The contrapositive of a conditional statement is obtained by switching and negating the hypothesis and conclusion. The contrapositive of p!q is (q!(p. Example: p: We have a blizzard. q: CHAT will be cancelled. p!q: If we have a blizzard, then CHAT will be cancelled. converse: q!p If CHAT is cancelled, then we had a blizzard. inverse: (p!(q If we don t have a blizzard, then CHAT won t be can`8v8888888 9 999R9T9\9^9`9b9d9f9j9l9p9ԧ}m[m}H}H}% j~hoh-P5CJ(OJQJaJ(#h-Ph-P5CJ(OJQJ^JaJ(h-Ph-P5CJ(OJQJaJ(hoh-P5CJ(OJQJaJ(h#O5CJ(OJQJaJ(h-P5CJ(OJQJaJ(h= 5CJ(OJQJaJ( j~h-PCJ(OJQJaJ( h-Ph-PCJ(OJQJ^JaJ(h-Ph-PCJ(OJQJaJ(h-PCJ(OJQJaJ(h-Ph-P>*CJ(OJQJaJ(p9r9v9x9z9|9~99999999999::::: : ::ųՆoXKXK>hx35CJ(OJQJaJ(h= 5CJ(OJQJaJ(-jhC^5CJ(OJQJUaJ(mHnHu-jhe3;5CJ(OJQJUaJ(mHnHuh-PCJ(OJQJaJ(% j~hoh-P5CJ(OJQJaJ(h-PCJ(OJQJ^JaJ(#h-Ph-P5CJ(OJQJ^JaJ(h-Ph-P5CJ(OJQJaJ(hoh-P5CJ(OJQJaJ(h-P5CJ(OJQJaJ(h-P5CJ(OJQJaJ(999994((( $$Ifa$gdhJkdw0$$IfTlֈ8Y Q t0644 laT99999(kd@1$$IfTlֈ8Y Q t0644 laT $$Ifa$gdhJ9999999 $$Ifa$gdhJ999994((( $$Ifa$gdhJkd 2$$IfTlֈ8Y Q t0644 laT99999(kd2$$IfTlֈ8Y Q t0644 laT $$Ifa$gdhJ999999: $$Ifa$gdhJ:::4' T^T`gd-Pkd3$$IfTlֈ8Y Q t0644 laT:: : : : :::::;;6;7;g;h;;;;;6<8<<<<< <^`*CJ(OJQJaJ(he3;h#O5CJOJQJaJh= 5CJ(OJQJaJ(hx35CJ(OJQJaJ(h#Oh#OCJ(OJQJaJ(he3;h#O6CJ,aJ,h<CJ(OJQJaJ(h#Ohx3CJ(OJQJaJ(h#OCJ(OJQJaJ(h#O5CJ(OJQJaJ(he3;hx3CJ(OJQJaJ(he3;he3;CJ(OJQJaJ(he3;he3;5CJOJQJaJ========V>X>>>>>>>>>>>>>?????????@@@@@@@@@่Ź๓xkh= 5CJ(OJQJaJ(h#Oh#O5CJ(OJQJaJ(he3;h#OOJQJ& j~h#Oh#OCJ(OJQJ^JaJ(" j~h#Oh#OCJ(OJQJaJ(h#OCJ(OJQJaJ(h#Oh#O>*CJ(OJQJaJ(he3;h= OJQJh#Oh#OCJ(OJQJaJ( h#Oh#OCJ(OJQJ^JaJ('<==>>@@@F@~@@@@AArAtAvAAA```B`D` 0^`0gdv# ^`gd C$ ^`gd#Ogd#O@@A A AAAtAvAAAAAAAAB```ɸ|jɸVJHJ<he3;CJ(OJQJaJ(Uhv#CJ(OJQJaJ(& j~h#Ohv#CJ(OJQJ^JaJ(" j~h#Ohv#CJ(OJQJaJ(#hv#hv#>*CJ(OJQJ^JaJ(he3;CJ(OJQJ^JaJ(hv#CJ(OJQJ^JaJ(hx3CJ(OJQJ^JaJ( h#Ohv#CJ(OJQJ^JaJ(h#Ohv#CJ(OJQJaJ(h#OCJ(OJQJaJ(hv#h#O>*CJ(OJQJaJ(hx3CJ(OJQJaJ(celled. contrapositive: (q!(p If CHAT is not cancelled, then we did not have a blizzard. Sample Problem: Statement: If my pet is a dog, then it is a mammal. 1. What is the converse of the statement? If my pet is a mammal, then it is a dog. 2. What is the inverse of the statement? If my pet is not a dog, then it is not a mammal. 3. What is the contrapositive of the statement? If my pet is not a mammal, then it is not a dog. Truth Table for converse, inverse, & contrapositive pq(p(qp`0`6`8`:`<`>`@`````````aaab*b+b[b㑅ueVJ;;JhvhvCJ OJQJaJ he3;hv#6CJ,aJ,hvhv#CJ OJQJaJ hv#hx35CJ(OJQJaJ(hv#hv#5CJ(OJQJaJ(he3;CJ(OJQJaJ(hx3CJ(OJQJaJ(" j~h#Ohv#CJ(OJQJaJ( h#Ohv#CJ(OJQJ^JaJ(h#Ohv#CJ(OJQJaJ(& j~h#Ohv#CJ(OJQJ^JaJ(hv#CJ(OJQJaJ(hv#hv#>*CJ(OJQJaJ(D``````````RaTaaaab*b+b\b]bbbgdv# ^`gdv ^`gdv# ^`gd C$ 0^`0gdv#[b\b]bbbbbbbbbbbbbbbdllll l llllllll l"lͽ}}{i}iTiiTi}) j~hv#hv5CJ(OJQJ^JaJ(#hv#hv5CJ(OJQJ^JaJ(U% j~hv#hv5CJ(OJQJaJ(hv#hv5CJ(OJQJaJ(hvhx35CJ(OJQJaJ(hv5CJ(OJQJaJ(hvhv#5CJ(OJQJaJ(hvCJ(OJQJaJ(he3;hv#6CJ,aJ,hvhvCJ OJQJaJ hv#CJ(OJQJaJ( bbbbbbbbbclll&l $$Ifa$gdhJ $$Ifa$gdv# ^`gd C$ ^`gdv ^`gde3; !q(p!(qq!p(q!(pTTFFTTTTTFFTFTTFFTTFTFFTFFTTTTTT *Conditional statements and contrapositives are equivalent. *Converses and inverses are equivalent.      PAGE 16 Equivalent Equivalent If 2 statements are equivalent, then the biconditional statement will always be true. The truth values match, so the 2 statements are equivalent. 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