In this paper we introduce a method called Dirac Assisted Tree (DAT)  , which can handle  heterogeneous Helmholtz equations with arbitrarily large variable wave numbers.
<meaning-changed> In this paper we introduce a method called Dirac Assisted Tree (DAT)  , which can handle  heterogeneous Helmholtz equations with arbitrarily large variable wave numbers.
In this paper we introduce a new method called the Dirac Assisted Tree (DAT) , which can handle heterogeneous Helmholtz equations with arbitrarily large variable wave numbers.