  We consider the realization of affine ADE Lie algebras as string junctions on
mutually non-local 7-branes in Type IIB string theory. The existence of the
affine algebra is signaled by the presence of the imaginary root junction
``delta'', which is realized as a string encircling the 7-brane configuration.
The level k of an affine representation partially constrains the asymptotic
(p,q) charges of string junctions departing the configuration. The junction
intersection form reproduces the full affine inner product, plus terms in the
asymptotic charges.

High Energy Physics - Theory