String vertices of open-closed string field theory on an arbitrary closed string background with N identical D-branes are investigated when N is large. We identify the relevant geometric master equation and solve it using open-closed hyperbolic genus zero string vertices with a milder systolic constraint. The limits corresponding to integrating out open or closed strings are investiga... https://countryscenesaddleryandpetsuppliers.shop/product-category/8ft-leads/