👉 In mathematics, a subadjacent is a set of elements that are adjacent to each other in a relation. It's like if you have two friends and they're next to each other on your street map. If you walk past them, you can see where they are because the distance between them is less than the length of the road. For example: - A subadjacent for the set {1, 2} would be {1, 2}, since we can see that both