Rupert Hall (1920–2009) Marie Boas Hall (1919–2009)

اثر هال (hall effect)

Timothy Hall

The emergence of lexico-grammatical productivity has been a central issue in the field of Second Language Acquisition (SLA). Ellis (2002) proposed that formulaic chunks of language are one resource for the learner to develop such productivity. This exploratory study sought to determine whether formulaic language chunks were observed in the oral production of three adult beginner learners of Eng...

Gillette Hall

اثر هال (hall effect)

Canonical Bases of Singularity Ringel-hall Algebras and Hall Polynomials

In this paper, the singularity Ringel-Hall algebras are defined. A new class of perverse sheaves are shown to have purity property. The canonical bases of singularity RingelHall algebras are constructed. As an application, the existence of Hall polynomials in the tame quiver algebras is proved.