10032 | 'Ancestral' relations are derived by iterating back from a given relation [Frege, by George/Velleman] |
12056 | An ancestral relation is either direct or transitively indirect [Wiggins] |
10617 | The 'ancestral' of a relation is a new relation which creates a long chain of the original relation [Smith,P] |
22284 | 'Greater than', which is the ancestral of 'successor', strictly orders the natural numbers [Potter] |