👉 Diplopic is a mathematical concept in combinatorics and graph theory. It relates to the number of ways that two sets can be paired up, where each set contains exactly one element from each other group. The concept of diplopic numbers was introduced by mathematician Charles Babbage in 1843 as part of his design for a hypothetical mechanical calculator known as the Analytical Engine. The term "diplopic" is often used to describe this type of mathematical object
