Definition: In mathematics, a lengthsman is a type of number system where all numbers are positive integers and each one has exactly two digits. This means that every number in the set can be represented as a sum of two distinct unit-digit integers. The set of lengthsmen is named after the Greek mathematician Diophantus. The concept of a lengthsman was introduced by the Indian mathematician Bhaskara I around 1200 AD, who also made significant contributions to the development of mathematical
what should be said.