# The tech tree model of heuretics is a directed acyclic graph It’s not actually a tree because there are many obvious examples of two ideas giving rise to one idea. The graph is guaranteed to be acyclic because the lowest level quanta are human thoughts which are events in time. (What about parallel development?) [[Each node on the tech tree can recursively be decomposed into more nodes]] [[What are the useful properties of directed acyclic graphs?]] ### Related * [[§Tech Tree Model of Heuretics]] * [Directed acyclic graph - Wikipedia](https://en.wikipedia.org/wiki/Directed_acyclic_graph#Mathematical_properties) * [[Each future node in the tech tree model has some function that maps effort in with a success probability distribution over time]] [Web URL for this note](http://notes.benjaminreinhardt.com/The+tech+tree+model+of+heuretics+is+a+directed+acyclic+graph) [Comment on this note](http://via.hypothes.is/http://notes.benjaminreinhardt.com/The+tech+tree+model+of+heuretics+is+a+directed+acyclic+graph)