What is a ray in geometry?
Ray
half of a line proceeding from an initial point
Ray (geometry), half of a line proceeding from an initial point
Ray (graph theory), an infinite sequence of vertices such that each vertex appears at most once in the sequence and each two consecutive vertices in the sequence are the two endpoints of an edge in the graph
Ray (optics), an idealized narrow beam of light
Ray (quantum theory), an equivalence class of state-vectors representing the same state