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# ORB_RESP_SOLVER

> The algorithm will be used for solving the orbital-response equations. The LINEQ option create the MO Hessian and solve the simultaneous linear equations with method choosen by the LINEQ_SOLVER option. The PCG option does not create the MO Hessian explicitly, instead it solves the simultaneous equations iteratively with the preconditioned conjugate gradient method.

> - Type: string
> - Possible Values: PCG, LINEQ
> - Default: PCG

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