Chinese Mathematics Chinese Contributions to Modern Mathematics

Early Chinese Civilizations Dating documents isn’t easy 1200 B.C B.C: Zhou Bi Suan Jing 250 B.C: Jiuzhang suanshu 202 B.C: Han dynasty

Zhou Bi Suan Jing ( 周髀算經 ) In the form of dialogue Between prince and minister concerning calendar Astronomical calculations Geometry arose from mensuration Introduction to properties of right triangles Fractions

Write a proof of the Pythagorean Theorem that would result in the illustration below.

The Nine Chapters – Jiuzhang suanshu Most influential of all Chinese mathematical books Contains 246 problems Surveying Agriculture Engineering Economics Solutions to Equations

Jiuzhang Suanshu The Nine Chapters of Mathematical Art contains 246 practical problems that might arise in the average day. This was used as the mathematical textbook of the age. What other civilization(s) did we study that taught mathematics in this way. What ancient artifact(s) gave us evidence for this historical conclusion? Uganda, Ishango Bone Babylonia, Plimpton Tablets Egypt, Rhind Papyrus Greece, Euclid’s Elements

A short summary of each of the nine chapters A brief tour of Jiuzhang suanshu

Chapter 1: Land Surveying 38 problems Area problems: Triangles, Quadrilaterals and Circles Rules for arithmetic of fractions Euclidean Algorithm Accurate approximation of

Chapter 1 Problems Problem 5: Now given a fraction 12/18. Tell: reducing it (to its lowest terms), what is obtained? Problem 6: Given another fraction 49/91. Tell: reducing it, what is obtained? The Rule for Reduction of Fractions If (the denominator and numerator) can be halved, halve them. If not, lay down the denominator and numerator, subtract the smaller number from the greater. Repeat this process to obtain GCD. Reduce them by the GCD.

Euclidean Algorithm Euclidean algorithm As we noted before, for any two numbers, m and n, if n < m, then we can arrive at the greatest common factor of n and m, gcd(n, m), by reiterating the process below Then,, the last nonzero remainder is the greatest common divisor.

Example

Chapter 2: Millet and Rice 46 problems Exchange of goods Rate change Proportions Percentages A circular road around a hill is 325 li long. Three persons A,B, and C run along the road. A runs 150 li per day, B runs 120 li per day, and C runs 90 li per day. If they start at the same time from the same place, after how many days will they meet again?

Chapter 3: Distribution by Proportion 20 problems Proportion Inverse Variation Compound Proportion Arithmetic Progression Geometric Progression

Chapter 4: Short Width 24 problems Area of rectangular field constant Width of field increased What is length of field?

Chapter 5: Civil Engineering 28 problems Constructions of canals, ditches, dykes Volumes of Solids Method of Exhaustian

Chapter 6: Fair Distribution of Goods 28 problems Ratio and proportion Travelling Taxation Sharing A cistern is filled through five canals. Open the first canal and the cistern fills in 1/3 day; with the second, it fills in 1 day, with the third, in 2 ½ days; with the fourth in 3 days, and with the fifth, in 5 days. If all canals are opened, how long will it take to fill the cistern?

Chapter 7: Excess and Deficit 20 problems Rule of False Position Linear Equations Certain Items are purchased jointly. If each person pays 8 coins, the surplus is 3 coins and if each person gives 7 coins, the deficiency is 4 coins. Find the number of people and the total cost of the items.

Chapter 8: Calculation by Square Tables Used Matrices to solve systems of equations with 6 unknowns Gaussian Elimination Magic Squares

Continue this process until the rectangular array is upper triangular.

Chapter 9: Right Angled Triangles 24 problems Pythagorean Theorem Similar Triangles