The empty string should not be confused with the empty language ∅, which is a formal language (i.e. a set of strings) that contains no strings, not even the empty string. The empty string has several properties: |ε| = 0. Its string length is zero. ε ⋅ s = s ⋅ ε = s. The empty string is the identity element of the concatenation operation
1951 was a common year starting on Monday of the Gregorian calendar, the 1951st year of the Common Era (CE) and Anno Domini (AD) designations, the 951st year of the 2nd millennium, the 51st year of the 20th century, and the 2nd year of the 1950s decade.
Kotor is a national powerhouse of water polo, which is a popular sport in Montenegro. The team of Primorac Kotor won the LEN Champions League in 2009. Another club from Kotor, VA Cattaro, won the 2010 edition of the LEN Euro Cup. Transport. Kotor is connected to the Adriatic Highway and the rest of the coast and inland Montenegro by Vrmac Tunnel.
1970 was a common year starting on Thursday of the Gregorian calendar, the 1970th year of the Common Era (CE) and Anno Domini (AD) ... 1883) February 14.
Before the end of the 1st century, the Roman authorities recognized Christianity as a separate religion from Judaism.The distinction, perhaps already made in practice at the time of the Great Fire of Rome in the year 64, was given official status by the emperor Nerva around the year 98 by granting Christians exemption from paying the Fiscus Iudaicus, the annual tax upon the Jews.
The earliest precursor of modern chess is a game called chaturanga, which flourished in India by the 6th century, and is the earliest known game to have two essential features found in all later chess variations—different pieces having different powers (which was not the case with checkers and Go), and victory depending on the fate of one piece, the king of modern chess.