.. _ug_tb_sh_1-1:

***********
( 1 ) terms
***********

Linear terms of the Hamiltonian are trivial and do not split into extra types.

.. math::
    C_1
    \sum_{\substack{\mu, \\ \alpha_1, \\ i_1}}
    J^{i_1}_{\alpha_1}
    S_{\mu, \alpha_1}^{i_1}

Relevant API
============

*   :py:attr:`magnopy.Convention.c1`

    Convention constant.

*   :py:meth:`magnopy.SpinHamiltonian.add`

    Method to add the parameter to the Hamiltonian.

*   :py:meth:`magnopy.SpinHamiltonian.remove`

    Method to remove the parameter from the Hamiltonian.

*   :py:attr:`magnopy.SpinHamiltonian.p1`

    An iterator over the parameters already added to the Hamiltonian.