double group

double group

[¦dəb·əl ′grüp]
(quantum mechanics)
A type of group useful in studying systems of half-integral spin; it is formed by modifying a finite point group by introducing an element which is a rotation through an angle of 2π about an arbitrary axis and which is not the unit element but gives the unit element when applied twice.
References in periodicals archive ?
Al-Thefiri, who is a double Group N and MERC 2 regional champion, said: "It's a good day.
In Double Group, another incision of 1.5 centimeter was needed at the seventh interspace along mid-axillary line.
A setback has kept him off the course for 371 days, but the double Group 1 winner's class can tell.
His topics include the octahedral group and the octahedral double group, Lie groups and Lie algebras, Coxeter's reflection groups, ALE spaces and gravitational instantons, knots and links and braids, elliptic curves and the monster group, sphere packing and error-correcting codes, the holographic principle, Calabi-Yau spaces and mirror symmetry, and Heisenberg algebras.
A total of 105 amplified products were obtained from 3 cultivars of semi double group of Chrysanthemum (purple, pink, marron).
San Miguel, which kicked off an aggressive expansion in 2008 to add power, mining, telecoms, oil refining and infrastructure to its stable of food and beverage businesses, continues to seek acquisitions as it looks to double group revenues in five years, from around 850 billion pesos now ($19.10 billion).
Furthermore, the acquisition, the first of a number of purchases the company intends to make, is seen to support TUF's aim to double group's revenues by 2020.
Elio Leoni Sceti, head of Iglo, yesterday announced an aim to double group sales to PS2.7billion by 2020.
The lender, which has operations in the Middle East, Asia and Africa, aims to nearly double group assets and income by 2017 and is considering the introduction of an Africa-specific brand to support this effort.
A double Group 3 winner with a 100 per cent record over 1m4f and a liking for soft going, Sapphire beat Shirocco Star and Dancing Rain so emphatically that Weld put into words what had been in his thoughts for a while.
Priced at INR 2,75,000 + VAT; this semi automatic machine comes with double group, dual espresso option, dual steamer for frothing milk.