👉 Hilts, also known as Hilbert's Hotel, is a mathematical concept in topology and graph theory. It was introduced by mathematician David Hilbert who proposed it in 1904 as an attempt to generalize the idea of a hotel for spaces without boundaries. The concept can be described as follows: - A space X is said to have a Hilts property if every closed subset H of X has a neighborhood basis, i.e., there exists a finite sequence of open sets U