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math.NT2021
A Multiplication Formula and Its Application
Yongwen Zhu
This article presents a vertical multiplication formula for calculating the multiplication of any two multi-digit integers, which may be not only used to design the multiplier but…
math.HO2021
On the Nine-Palace Arithmetic -- A New Method of Mental Calculation
Yongwen Zhu
Based on the nine-palace diagram, we establish the systematical geometric theory of arithmetic, which can realize the arithmetical addition, subtraction, multiplication, division a…