Hadith of Golden Chain of that the hadith is called "golden chain". Because of that, this hadith was named Al-Silsilah al-Dhahab. Al-Silsilah al-Dhahab is Musnad. Twenty (or ten or thirty) thousands have narrated this event, but only fifty narrations are available. The chain of the narrators of the hadith reaches the Prophet of Islam through Ahl al-Bayt, hence called Hadith of Golden Chain. Hadith of Golden Chain Hadith al-Silsilah al-Dhahab () (Hadith of the Golden Chain) is a hadith narrated from Ali al-Ridha, the eighth Imam of the Shia. The "chain" is a reference to the continuity of spiritual authority which is passed down
Spanning tree and "routing loops", many routing protocols designed for such networks—including the Spanning Tree Protocol, Open Shortest Path First, Link-state routing protocol, Augmented tree-based routing, etc.—require each router to remember a spanning tree. A special kind of spanning tree, the Xuong tree, is used in topological graph theory to find graph embeddings with maximum genus. A Xuong tree is a spanning tree such that, in the remaining graph, the number of connected components with an odd number of edges is as small as possible. A Xuong tree and an associated maximum-genus embedding can be found in polynomial time. A tree is