Gad or GAD may refer to:
In the Bible, Gad was the son of Jacob and the founder of the tribe of Gad. Gad is a surname, masculine given name and nickname which may refer to:
Gad was the name of the pan-Semitic god of fortune, and is attested in ancient records of Aram and Arabia. Gad is also mentioned by the Book of Isaiah (Isaiah 65:11 - some translations simply call him (the god of) Fortune), as having been worshipped by a number of Hebrews during the babylonian captivity. Gad apparently differed from the god of destiny, who was known as Meni. The root verb in Gad means cut or divide, and from this comes the idea of fate being meted out.
It is possible that the son of Jacob named Gad is named after Gad, although the text presents a different reason, the (ketub) quotation of Zilpa (Gad's mother) giving the reason of Gad's name could be understood that way.
How widespread the cult of Gad, the deity, was in Canaanite times may be inferred from the names Baalgad, a city at the foot of Mount Hermon, and Migdal-gad, in the territory of Judah. Compare also the proper names Gaddi and Gaddiel in the tribes of Manasseh and Zebulun (Numbers 13:10, 11). At the same time it must not be supposed that Gad was always regarded as an independent deity. The name was doubtless originally an appellative, meaning the power that allots. Hence any of the greater gods supposed to favour men might be thought of as the giver of good fortune and be worshiped under that title; it is possible that Jupiter, the planet, may have been the Gad thus honoured - among the Arabs the planet Jupiter was called the greater Fortune (Venus was styled the lesser Fortune).
Singular may refer to:
In linguistics, grammatical number is a grammatical category of nouns, pronouns, and adjective and verb agreement that expresses count distinctions (such as "one", "two", or "three or more"). In many languages, including English, the number categories are singular and plural. Some languages also have a dual number or other arrangements.
The count distinctions typically, but not always, correspond to the actual count of the referents of the marked noun or pronoun.
The word "number" is also used in linguistics to describe the distinction between certain grammatical aspects that indicate the number of times an event occurs, such as the semelfactive aspect, the iterative aspect, etc. For that use of the term, see "Grammatical aspect".
Most languages of the world have formal means to express differences of number. One widespread distinction, found in English and many other languages, involves a simple two-way number contrast between singular and plural (car/cars, child/children, etc.). Discussion of other more elaborate systems of number appears below.
Singular (typeset Singular) is a computer algebra system for polynomial computations with special emphasis on the needs of commutative and non-commutative algebra, algebraic geometry, and singularity theory. Singular is free software released under the GNU General Public License. Problems in non-commutative algebra can be tackled with the Singular offspring Plural. Singular is developed under the direction of Wolfram Decker, Gert-Martin Greuel, Gerhard Pfister, and Hans Schönemann, who head Singular's core development team within the Department of Mathematics of the University of Kaiserslautern.
In the DFG Priority Program 1489, interfaces to GAP, Polymake and Gfan are being developed in order to cover recently established areas of mathematics involving convex and algebraic geometry, such as toric and tropical geometry.