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Glossary of mathematical symbols. A mathematical symbol is a figure or a combination of figures that is used to represent a mathematical object, an action on mathematical objects, a relation between mathematical objects, or for structuring the other symbols that occur in a formula. As formulas are entirely constituted with symbols of various ...
propositional logic, Boolean algebra, first-order logic. ⊥ {\displaystyle \bot } denotes a proposition that is always false. The symbol ⊥ may also refer to perpendicular lines. The proposition. ⊥ ∧ P {\displaystyle \bot \wedge P} is always false since at least one of the two is unconditionally false. ∀.
List of chemical elements. 118 chemical elements have been identified and named officially by IUPAC. A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z ). [ 1]
Saturn I. The first Saturn I was launched October 27, 1961. The Saturn I[ a] was a rocket designed as the United States' first medium lift launch vehicle for up to 20,000-pound (9,100 kg) low Earth orbit payloads. [ 2] Its development was taken over from the Advanced Research Projects Agency (ARPA) in 1958 by the newly formed civilian NASA.
As a general guide to flashes of the period, the colours had meaning. For Corps/Arm of service, these were, generally, the following: [ 4] Grey - Mounted Units. Black - Infantry. Yellow - Artillery [ 3] The bottom colour would be the arm of service, the top colour the province. Blue - Natal.
An imaginary number is the product of a real number and the imaginary unit i, [ note 1] which is defined by its property i2 = −1. [ 1][ 2] The square of an imaginary number bi is −b2. For example, 5i is an imaginary number, and its square is −25. The number zero is considered to be both real and imaginary. [ 3]
The International Organization for Standardization ( ISO / ˈaɪsoʊ / [ 3]) is an independent, non-governmental, international standard development organization composed of representatives from the national standards organizations of member countries. [ 4] Membership requirements are given in Article 3 of the ISO Statutes.
In standard form, it is written as 1 × 10 9. ... However, this is not common anymore, and the word has been used to mean one thousand million (1,000,000,000) for ...