Airstrike

An airstrike or air strike is an attack on a specific objective by military aircraft during an offensive mission. Air strikes are commonly delivered from aircraft such as fighters, bombers, ground attack aircraft, and attack helicopters. The official definition includes all sorts of targets, including enemy air targets, but in popular use the term is usually narrowed to a tactical (small-scale) attack on a ground or naval objective. Weapons used in an airstrike can range from machine gun bullets and missiles to various types of bombs. It is also commonly referred to as an air raid.

In close air support, air strikes are usually controlled by trained observers for coordination with friendly ground troops in a manner derived from artillery tactics.

History

Islamic State of Iraq and the Levant

Islamic State of Iraq and the Levant (ISIL, IPA /ˈaɪsᵻl/), alternatively translated as Islamic State of Iraq and Syria or Islamic State of Iraq and al-Sham (ISIS, /ˈaɪsᵻs/), is a Salafi jihadist militant group that follows an Islamic fundamentalist, Wahhabi doctrine of Sunni Islam. The group is also known as Daesh (داعش‎ dāʿish, IPA: [ˈdaːʕiʃ]), which is an acronym derived from its Arabic name ad-Dawlah al-Islāmiyah fī 'l-ʿIrāq wa-sh-Shām (الدولة الإسلامية في العراق والشام‎).

Universal quantification

In predicate logic, a universal quantification is a type of quantifier, a logical constant which is interpreted as "given any" or "for all". It expresses that a propositional function can be satisfied by every member of a domain of discourse. In other words, it is the predication of a property or relation to every member of the domain. It asserts that a predicate within the scope of a universal quantifier is true of every value of a predicate variable.

It is usually denoted by the turned A (∀) logical operator symbol, which, when used together with a predicate variable, is called a universal quantifier ("∀x", "∀(x)", or sometimes by "(x)" alone). Universal quantification is distinct from existential quantification ("there exists"), which asserts that the property or relation holds only for at least one member of the domain.

Quantification in general is covered in the article on quantification (logic). Symbols are encoded U+2200 ∀ FOR ALL (HTML ∀ · ∀ · as a mathematical symbol).