ࡱ> @ 9bjbjFF %",,52222"44":k(k(k(9999999$;R=@9w* (^k(w*w*@922 9---w*X29-w*9--V.6@6 pkΫ*n6 990:z6T>+b>6D,2222>6Lk(L(6-(,)^k(k(k(@9@9""&d-""&Modular Arithmetic (following Crazy clocks and Checking out bars, Chapter 2.4 from the Heart of Mathematics- An invitation to effective thinking. 2nd Edition by E. B. Burger and M. Starbird. Key College Publishing. 2005) Cyclicity of time. Consider a given watch and a particular time marked on the watch such as 10:00 (ignore a.m. or p.m. since a regular 12 hours watch does not "know" anything about day or night). What time will the watch show 35 hours later? One way to figure this out is by initially marking 10:00 o'clock and then going around the clock 35 more times. The final position of the "hands" of the clock will give us the answer. Starting at 10:00 11, 12 (two hours) 1, 2, 3,4, 5, 6, 7,8, 9,10,11, 12 (twelve hours) 1, 2, 3,4, 5, 6, 7,8, 9,10,11, 12 (twelve hours) 1, 2, 3,4, 5, 6, 7,8, 9 (nine hours) From the following example, we can observe that: Time is cyclical. After reaching 12, we start from 1 again until we get to 12 Time arithmetic is different than regular arithmetic. What will be the time for the particular cases shown below? 3 + 12 = 5 + 12= 10 + 12 = Adding "12 hours" to any given time returns the hands of the clock to their original position. In a regular 12-hour clock, therefore, "12" behaves like a zero (0) in clock arithmetic. What will be the time shown in the clock if the following operations are carried out using the 12-hour clock? Assume that * stands for multiplication operator. 10 + 35 = ? (5 * 8) + 12 = ? (9+11)*5 =  SHAPE \* MERGEFORMAT  Consider a 7-hour clock as shown above and the time indicated by the arrow. Find the following times a) 3 +7 = b) 4 + 7 c) 1+ 7 = What are the results of the following arithmetic operations on the 7-hour clock? a) (4 * 6) + 5 b) (5*3) + 4 c) (4 * 7) + 6 Equivalence If a and b are integers and m is a positive integer, then we will say that a is congruent with b modulo m if m divides (a-b). That is, both a and b have the same remainder when divided by m. We will use the notation a a" b (mod m) to indicate that a is congruent with b modulo m. Since m is the divisor, according to the Division Algorithm, 0 d" r < m therefore, the only possible remainder are 0, 1, 2, 3, 4, 5, 6, 7, and 8. Notice that in a mod9 there are no remainders equal to 9. In the 9-hour clock shown below we can say that 9 ( 0 mod 9 because 9 "behaves" like a zero. This is so because for any given time, let's say, 2, nine (9) consecutive times around the clock takes us to the same starting position. In this case 9 ( 0(mod 9).  The fact that 9 a" 0 (mod 9) allow us to carry out arithmetic operations "as usual" with the understanding that 9 can be "replaced by" 0. In mod 9 arithmetic, what is the result of 13 + 25? What is the result of (3*5) + (7*100)? We can generalize this concept of clock arithmetic to any clock provided that we know the number of hours on the clock. For any particular natural number n, we write "mod n" to mean a clock that has n hours marked on it beginning with 0, 1, 2, (n-1). We need to remember that adding n to any number bring us back to the same number. So the n behaves like an ordinary 0. Calculate 26 + 315 a" 0 mod 29 State if the following operations are true or false: 72 + (5*57) a" 40 mod 48 24 + 5301 + (6*31) a" 3 mod 5 92000 a" 1 mod 80 (hint: write 2000 as 2*1000 and use the fact that (a)bc = (ab)c. Applications of modular arithmetic Check digits of UPC (Universal Product Code) Consider a bar code as shown here. A bar code generally has 12 or 13 digits. The first six digits encode information about the manufacturer, and the next five digits encode information about the product. The last digit is called a check digit. Let's call the first 11 digits of this bar code d1, d2, d11 and multiply every other digit by 3. That is, 3d1 + d2 + 3d3 + d4 +3d5 + d6 + 3d7 + d8 + 3d9 + d10 + 3d11 Now select a check digit, c (0d" c d" 9) in such a way that 3d1 + d2 + 3d3 + d4 +3d5 + d6 + 3d7 + d8 + 3d9 + d10 + 3d11 + c a" 0 mod 10. (I) In this particular example, if we replace the di by their corresponding values we have that: (3*0) + 3 + (3*6) ~  C ; FG^st{|}ûå˥h'.hGhG6hWuehG6>*hGhFChFC5hFCh?jhWueUmHnHuhWuejhWueUhh}bh-h+|ZhRhh&hD.h88qhGh5hGhhGhH*hGhh&hGh5.  B C t 5 6 ? G Q R $$$$$$$$$$$$$$$$$$$$$$$$$$$$gdGh99 FG`b|$$$$$$$$$$$$$j$$$$$$$$$$$$$$$$a$gd QgdWue:<bdtvx  <=Ie    Z\`󼵼󣟗hBFHhhBFHh,E>*h,Eh88qjhLp'UmHnHu jhV hV jh'.hLp'h Qh Q6h QhLp'hG6hGhRhLp'hFC6hFCh'.h'.h'.67|    LM$$$$$$$$$$$$$$ & Fgdap$a$gd88q@ ^@ gd,Egd88qgdWue$a$gd Qst&./KLM^_x| ;[Žjh9UmHnHuhVh9h4h''h''h,E5h''h''5h,E haphaphRhaphapH*h=*h=*H* h=*h,E h=*6h=*haphap6hap;~tv z00011z2{2|2$$$$$$$$$$$$$$$$$$$$ & FgdapCDGHLN}~vz| ~0d0f0000º³ճճU hBFHh88qhBFHhH* hBFHhhBFHhCJaJhRhhCJH*aJhhCJaJhh9h9H*h9E+ 0 + (3*0) + 0 + (3*2) + 8 + (3*5) + 1 (3*0) + c a" 0 mod 10 51 + c a" 0 mod 10 1 + c a" 0 mod 10 (remember that adding 10 is equivalent to adding 0). This last expression indicates that c = 9 (as shown in the bar code above) Using modular arithmetic this way allow us to detect an error if exactly one digit is wrong and, in most cases, if two adjacent numbers are switched. Check digits of personal checks. Checks in the U.S have a nine-digit number in its lower left-hand corner called the routing number. This number is the identification number of the bank. The last digit of this routing number is a check digit. The check digit for routing number is calculated using a more complicated formula than the one we used for UPCs. 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