The Hamming weight is named after Richard Hamming although he did not originate the notion.[5] The Hamming weight of binary numbers was already used in 1899 by James W. L. Glaisher to give a formula for the number of odd binomial coefficients in a single row of Pascal's triangle.[6] Irving S. Reed introduced a concept, equivalent to Hamming weight in the binary case, in 1954.[7] Hamming weight is
![Hamming weight - Wikipedia](https://cdn-ak-scissors.b.st-hatena.com/image/square/070bb14aa155e538fc8c62b770acc1574de28a87/height=288;version=1;width=512/https%3A%2F%2Fupload.wikimedia.org%2Fwikipedia%2Fcommons%2F6%2F63%2FHamming_weight_plot.png)