Empty setIn mathematics, the empty set is the unique set having no elements; its size or cardinality (count of elements in a set) is zero. Some axiomatic set theories ensure that the empty set exists by including an axiom of empty set, while in other theories, its existence can be deduced. Many possible properties of sets are vacuously true for the empty set. Any set other than the empty set is called non-empty. In some textbooks and popularizations, the empty set is referred to as the "null set".
Arch of ConstantineThe Arch of Constantine (Arco di Costantino) is a triumphal arch in Rome dedicated to the emperor Constantine the Great. The arch was commissioned by the Roman Senate to commemorate Constantine's victory over Maxentius at the Battle of Milvian Bridge in AD 312. Situated between the Colosseum and the Palatine Hill, the arch spans the Via Triumphalis, the route taken by victorious military leaders when they entered the city in a triumphal procession. Dedicated in 315, it is the largest Roman triumphal arch, with overall dimensions of high, wide and deep.
Roman Britain'Roman Britain' was the territory that became the Roman Province of Britannia after the Roman conquest of Britain, consisting of a large part of the island of Great Britain. The occupation lasted from AD 43 to AD 410. Julius Caesar invaded Britain in 55 and 54 BC as part of his Gallic Wars. According to Caesar, the Britons had been overrun or culturally assimilated by Belgic tribes during the British Iron Age and had been aiding Caesar's enemies. The Belgae were the only Celtic tribe to cross the sea into Britain, for to all other Celtic tribes this land was unknown.
Economy of ancient GreeceThe economy of ancient Greece was defined largely by the region's dependence on imported goods. As a result of the poor quality of Greece's soil, agricultural trade was of particular importance. The impact of limited crop production was somewhat offset by Greece's paramount location, as its position in the Mediterranean gave its provinces control over some of Egypt's most crucial seaports and trade routes. Beginning in the 6th century BC, trade craftsmanship and commerce, principally maritime, became pivotal aspects of Greek economic output.
Arch of TitusThe Arch of Titus (Arco di Tito; Arcus Titi) is a 1st-century AD honorific arch, located on the Via Sacra, Rome, just to the south-east of the Roman Forum. It was constructed in AD 81 by the Emperor Domitian shortly after the death of his older brother Titus to commemorate Titus's official deification or consecratio and the victory of Titus together with their father, Vespasian, over the Jewish rebellion in Judaea.
FestivalA festival is an extraordinary event celebrated by a community and centering on some characteristic aspect or aspects of that community and its religion or cultures. It is often marked as a local or national holiday, mela, or eid. A festival constitutes typical cases of glocalization, as well as the high culture-low culture interrelationship. Next to religion and folklore, a significant origin is agricultural. Food is such a vital resource that many festivals are associated with harvest time.
Ancient Greek religionReligious practices in ancient Greece encompassed a collection of beliefs, rituals, and mythology, in the form of both popular public religion and cult practices. The application of the modern concept of "religion" to ancient cultures has been questioned as anachronistic. The ancient Greeks did not have a word for 'religion' in the modern sense. Likewise, no Greek writer known to us classifies either the gods or the cult practices into separate 'religions'.
Rough setIn computer science, a rough set, first described by Polish computer scientist Zdzisław I. Pawlak, is a formal approximation of a crisp set (i.e., conventional set) in terms of a pair of sets which give the lower and the upper approximation of the original set. In the standard version of rough set theory (Pawlak 1991), the lower- and upper-approximation sets are crisp sets, but in other variations, the approximating sets may be fuzzy sets. The following section contains an overview of the basic framework of rough set theory, as originally proposed by Zdzisław I.
Holy Roman EmpireThe Holy Roman Empire, also known as the Holy Roman Empire of the German Nation after 1512, was a political entity usually headed by the Holy Roman Emperor in Central and Western Europe. It developed in the Early Middle Ages and continued until its dissolution in 1806 during the Napoleonic Wars. On 25 December 800, Pope Leo III crowned the Frankish king Charlemagne as Roman emperor, reviving the title in Western Europe more than three centuries after the fall of the ancient's Western Roman Empire in 476.
Baroque architectureBaroque architecture is a highly decorative and theatrical style which appeared in Italy in the early 17th century and gradually spread across Europe. It was originally introduced by the Catholic Church, particularly by the Jesuits, as a means to combat the Reformation and the Protestant church with a new architecture that inspired surprise and awe. It reached its peak in the High Baroque (1625–1675), when it was used in churches and palaces in Italy, Spain, Portugal, France, Bavaria and Austria.
