A quasi-triangular quasi-Hopf algebra is a specialized form of a quasi-Hopf algebra defined by the Ukrainian mathematician Vladimir Drinfeld in 1989.
It is also a generalized form of a quasi-triangular Hopf algebra.
A quasi-triangular quasi-Hopf algebra is a set
, ε ,
, ε ,
is a quasi-Hopf algebra and
known as the R-matrix, is an invertible element such that for all
is the switch map given by
The quasi-Hopf algebra becomes triangular if in addition,
is the same as for a quasi-Hopf algebra, with the additional definition of the twisted R-matrix A quasi-triangular (resp.
triangular) quasi-Hopf algebra with
is a quasi-triangular (resp.
triangular) Hopf algebra as the latter two conditions in the definition reduce the conditions of quasi-triangularity of a Hopf algebra.
Similarly to the twisting properties of the quasi-Hopf algebra, the property of being quasi-triangular or triangular quasi-Hopf algebra is preserved by twisting.
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