After reading the contents of Egyptian mathematics, I learned that ancient Egypt, a civilized society with a long history as China, lasted for 4,000 years, and was extremely short of mathematical historical records. This is related to ancient Egyptian paper, which is made of papyrus, which is a fragile substance and extremely difficult to preserve. Rhine ancient books and Moscow ancient books are two main sources of information.
Egyptians have two outstanding characteristics in the use of numbers: the first is an operation table, and all calculations are based on addition and multiplication; The second is their preference for unit scores (scores). Multiplication is a repeated doubling operation, and then the appropriate intermediate results are added. For example, 19×5, first calculate 19× 2 = 38, then calculate 19× 4 = 38 x2 = 76, 1+4 = 5, so19× 5 =/kl.
The division operation can also do similar processing, and then generate unit scores. The Egyptians expressed unit scores by drawing a horizontal line on the numbers. There is no sign corresponding to 2/5 and other fractions, except 2/3. Rhind Guben contains a score table in the form of two thirds of n, where n is an odd number. This table breaks down two thirds of n into unit fractions. So 2/5 is divided into 1/3 and115, and 2/7 is divided into 1/4 and 1/28. This recording method has not found any practical value at present. N is odd, because when n is even, it can be converted into a unit fraction. Since Egyptians like unit scores so much, why make an exception of 2/3? 2/3 can be divided into 1/2 and 1/6 according to the decomposition method in the above table. So when Egyptians use fractions, what makes 2/3 a special existence other than unit fractions?
The advanced level of mathematics in Egypt is not clear due to the lack of historical materials, but the exquisite architecture of the world-famous pyramids makes us have to admit its advanced level of mathematics. But is this progress an independent achievement in this field based on the unique interest in pyramids (leading in a certain field), or is its overall advanced level and exquisite pyramids just a part of its lost knowledge?
In view of the exquisite architecture of the pyramids and the volume calculation of the frustum in Moscow ancient books, we can't deny the contribution of Egyptian mathematics to geometry.