Cluster analysisCluster analysis or clustering is the task of grouping a set of objects in such a way that objects in the same group (called a cluster) are more similar (in some sense) to each other than to those in other groups (clusters). It is a main task of exploratory data analysis, and a common technique for statistical data analysis, used in many fields, including pattern recognition, , information retrieval, bioinformatics, data compression, computer graphics and machine learning.
Papal StatesThe Papal States (ˈpeɪpəl ; Stato Pontificio; Dicio Pontificia), officially the State of the Church (Stato della Chiesa ˈstaːto della ˈkjɛːza; Status Ecclesiasticus), were a series of territories in the Italian Peninsula under the direct sovereign rule of the pope from 756 until 1870. They were among the major states of Italy from the 8th century until the unification of Italy, between 1859 and 1870. The state had its origins in the rise of Christianity throughout Italy, and with it the rising influence of the Christian Church.
Republic of VeniceThe Republic of Venice or Venetian Republic was a sovereign state and maritime republic in parts of present-day Italy (mainly northeastern Italy) that existed for 1100 years from AD 697 until AD 1797. Centered on the lagoon communities of the prosperous city of Venice, it incorporated numerous overseas possessions in modern Croatia, Slovenia, Montenegro, Greece, Albania and Cyprus. The republic grew into a trading power during the Middle Ages and strengthened this position during the Renaissance.
