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README.rst 

=============
BiInts Module
=============

Here, all bi-electronic integrals (:math:`1/r_{12}`) are computed. As they have
4 indices and many are zero, they are stored in a map, as defined in
``Utils/map_module.f90``.  To fetch an AO integral, use the
``get_ao_bielec_integral(i,j,k,l,ao_integrals_map)`` function, and to fetch and
MO integral, use ``get_mo_bielec_integral(i,j,k,l,mo_integrals_map)`` or
``mo_bielec_integral(i,j,k,l)``.


Needed Modules
==============

.. Do not edit this section. It was auto-generated from the
.. by the `update_README.py` script.

.. image:: tree_dependency.png

* `Pseudo <http://github.com/LCPQ/quantum_package/tree/master/src/Pseudo>`_
* `Bitmask <http://github.com/LCPQ/quantum_package/tree/master/src/Bitmask>`_

Documentation
=============

.. Do not edit this section. It was auto-generated from the
.. by the `update_README.py` script.

`add_integrals_to_map <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/mo_bi_integrals.irp.f#L42>`_
  Adds integrals to tha MO map according to some bitmask


`ao_bielec_integral <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/ao_bi_integrals.irp.f#L1>`_
  integral of the AO basis <ik|jl> or (ij|kl)
  i(r1) j(r1) 1/r12 k(r2) l(r2)


`ao_bielec_integral_schwartz <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/ao_bi_integrals.irp.f#L489>`_
  Needed to compute Schwartz inequalities


`ao_bielec_integral_schwartz_accel <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/ao_bi_integrals.irp.f#L107>`_
  integral of the AO basis <ik|jl> or (ij|kl)
  i(r1) j(r1) 1/r12 k(r2) l(r2)


`ao_bielec_integrals_in_map <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/ao_bi_integrals.irp.f#L322>`_
  Map of Atomic integrals
  i(r1) j(r2) 1/r12 k(r1) l(r2)


`ao_integrals_map <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/map_integrals.irp.f#L6>`_
  AO integrals


`ao_integrals_threshold <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/ezfio_interface.irp.f#L46>`_
  If |<pq|rs>| < ao_integrals_threshold then <pq|rs> is zero


`ao_l4 <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/ao_bi_integrals.irp.f#L279>`_
  Computes the product of l values of i,j,k,and l


`bielec_integrals_index <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/map_integrals.irp.f#L19>`_
  Undocumented


`bielec_integrals_index_reverse <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/map_integrals.irp.f#L36>`_
  Undocumented


`clear_ao_map <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/map_integrals.irp.f#L223>`_
  Frees the memory of the AO map


`clear_mo_map <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/map_integrals.irp.f#L399>`_
  Frees the memory of the MO map


`compute_ao_bielec_integrals <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/ao_bi_integrals.irp.f#L290>`_
  Compute AO 1/r12 integrals for all i and fixed j,k,l


`disk_access_ao_integrals <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/ezfio_interface.irp.f#L28>`_
  Read/Write AO integrals from/to disk [ Write | Read | None ]


`disk_access_mo_integrals <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/ezfio_interface.irp.f#L68>`_
  Read/Write MO integrals from/to disk [ Write | Read | None ]


`do_direct_integrals <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/ezfio_interface.irp.f#L6>`_
  Compute integrals on the fly


`dump_ao_integrals <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/map_integrals.irp.f_template_547#L3>`_
  Save to disk the $ao integrals


`dump_mo_integrals <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/map_integrals.irp.f_template_547#L140>`_
  Save to disk the $ao integrals


`eri <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/ao_bi_integrals.irp.f#L652>`_
  ATOMIC PRIMTIVE bielectronic integral between the 4 primitives ::
  primitive_1 = x1**(a_x) y1**(a_y) z1**(a_z) exp(-alpha * r1**2)
  primitive_2 = x1**(b_x) y1**(b_y) z1**(b_z) exp(- beta * r1**2)
  primitive_3 = x2**(c_x) y2**(c_y) z2**(c_z) exp(-delta * r2**2)
  primitive_4 = x2**(d_x) y2**(d_y) z2**(d_z) exp(- gama * r2**2)


`gauleg <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/gauss_legendre.irp.f#L29>`_
  Gauss-Legendre


`gauleg_t2 <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/gauss_legendre.irp.f#L10>`_
  t_w(i,1,k) = w(i)
  t_w(i,2,k) = t(i)


`gauleg_w <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/gauss_legendre.irp.f#L11>`_
  t_w(i,1,k) = w(i)
  t_w(i,2,k) = t(i)


`general_primitive_integral <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/ao_bi_integrals.irp.f#L514>`_
  Computes the integral <pq|rs> where p,q,r,s are Gaussian primitives


`get_ao_bielec_integral <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/map_integrals.irp.f#L113>`_
  Gets one AO bi-electronic integral from the AO map


`get_ao_bielec_integrals <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/map_integrals.irp.f#L137>`_
  Gets multiple AO bi-electronic integral from the AO map .
  All i are retrieved for j,k,l fixed.


`get_ao_bielec_integrals_non_zero <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/map_integrals.irp.f#L172>`_
  Gets multiple AO bi-electronic integral from the AO map .
  All non-zero i are retrieved for j,k,l fixed.


`get_ao_map_size <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/map_integrals.irp.f#L214>`_
  Returns the number of elements in the AO map


`get_mo_bielec_integral <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/map_integrals.irp.f#L281>`_
  Returns one integral <ij|kl> in the MO basis


`get_mo_bielec_integrals <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/map_integrals.irp.f#L310>`_
  Returns multiple integrals <ij|kl> in the MO basis, all
  i for j,k,l fixed.


`get_mo_bielec_integrals_existing_ik <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/map_integrals.irp.f#L341>`_
  Returns multiple integrals <ij|kl> in the MO basis, all
  i(1)j(1) 1/r12 k(2)l(2)
  i for j,k,l fixed.


`get_mo_map_size <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/map_integrals.irp.f#L391>`_
  Return the number of elements in the MO map


`give_polynom_mult_center_x <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/ao_bi_integrals.irp.f#L850>`_
  subroutine that returns the explicit polynom in term of the "t"
  variable of the following polynomw :
  I_x1(a_x, d_x,p,q) * I_x1(a_y, d_y,p,q) * I_x1(a_z, d_z,p,q)


`i_x1_new <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/ao_bi_integrals.irp.f#L771>`_
  recursive function involved in the bielectronic integral


`i_x1_pol_mult <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/ao_bi_integrals.irp.f#L913>`_
  recursive function involved in the bielectronic integral


`i_x1_pol_mult_a1 <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/ao_bi_integrals.irp.f#L1033>`_
  recursive function involved in the bielectronic integral


`i_x1_pol_mult_a2 <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/ao_bi_integrals.irp.f#L1087>`_
  recursive function involved in the bielectronic integral


`i_x1_pol_mult_recurs <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/ao_bi_integrals.irp.f#L947>`_
  recursive function involved in the bielectronic integral


`i_x2_new <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/ao_bi_integrals.irp.f#L806>`_
  recursive function involved in the bielectronic integral


`i_x2_pol_mult <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/ao_bi_integrals.irp.f#L1149>`_
  recursive function involved in the bielectronic integral


`insert_into_ao_integrals_map <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/map_integrals.irp.f#L250>`_
  Create new entry into AO map


`insert_into_mo_integrals_map <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/map_integrals.irp.f#L265>`_
  Create new entry into MO map, or accumulate in an existing entry


`integrale_new <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/ao_bi_integrals.irp.f#L697>`_
  calculate the integral of the polynom ::
  I_x1(a_x+b_x, c_x+d_x,p,q) * I_x1(a_y+b_y, c_y+d_y,p,q) * I_x1(a_z+b_z, c_z+d_z,p,q)
  between ( 0 ; 1)


`load_ao_integrals <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/map_integrals.irp.f_template_547#L89>`_
  Read from disk the $ao integrals


`load_mo_integrals <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/map_integrals.irp.f_template_547#L226>`_
  Read from disk the $ao integrals


`mo_bielec_integral <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/map_integrals.irp.f#L298>`_
  Returns one integral <ij|kl> in the MO basis


`mo_bielec_integral_jj <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/mo_bi_integrals.irp.f#L465>`_
  mo_bielec_integral_jj(i,j) = J_ij
  mo_bielec_integral_jj_exchange(i,j) = K_ij
  mo_bielec_integral_jj_anti(i,j) = J_ij - K_ij


`mo_bielec_integral_jj_anti <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/mo_bi_integrals.irp.f#L467>`_
  mo_bielec_integral_jj(i,j) = J_ij
  mo_bielec_integral_jj_exchange(i,j) = K_ij
  mo_bielec_integral_jj_anti(i,j) = J_ij - K_ij


`mo_bielec_integral_jj_anti_from_ao <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/mo_bi_integrals.irp.f#L327>`_
  mo_bielec_integral_jj_from_ao(i,j) = J_ij
  mo_bielec_integral_jj_exchange_from_ao(i,j) = J_ij
  mo_bielec_integral_jj_anti_from_ao(i,j) = J_ij - K_ij


`mo_bielec_integral_jj_exchange <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/mo_bi_integrals.irp.f#L466>`_
  mo_bielec_integral_jj(i,j) = J_ij
  mo_bielec_integral_jj_exchange(i,j) = K_ij
  mo_bielec_integral_jj_anti(i,j) = J_ij - K_ij


`mo_bielec_integral_jj_exchange_from_ao <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/mo_bi_integrals.irp.f#L326>`_
  mo_bielec_integral_jj_from_ao(i,j) = J_ij
  mo_bielec_integral_jj_exchange_from_ao(i,j) = J_ij
  mo_bielec_integral_jj_anti_from_ao(i,j) = J_ij - K_ij


`mo_bielec_integral_jj_from_ao <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/mo_bi_integrals.irp.f#L325>`_
  mo_bielec_integral_jj_from_ao(i,j) = J_ij
  mo_bielec_integral_jj_exchange_from_ao(i,j) = J_ij
  mo_bielec_integral_jj_anti_from_ao(i,j) = J_ij - K_ij


`mo_bielec_integrals_in_map <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/mo_bi_integrals.irp.f#L22>`_
  If True, the map of MO bielectronic integrals is provided


`mo_bielec_integrals_index <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/mo_bi_integrals.irp.f#L1>`_
  Computes an unique index for i,j,k,l integrals


`mo_integrals_map <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/map_integrals.irp.f#L237>`_
  MO integrals


`mo_integrals_threshold <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/ezfio_interface.irp.f#L86>`_
  If |<ij|kl>| < ao_integrals_threshold then <pq|rs> is zero


`n_pt_max_integrals_16 <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/gauss_legendre.irp.f#L1>`_
  Aligned n_pt_max_integrals


`n_pt_sup <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/ao_bi_integrals.irp.f#L836>`_
  Returns the upper boundary of the degree of the polynomial involved in the
  bielctronic integral :
  Ix(a_x,b_x,c_x,d_x) * Iy(a_y,b_y,c_y,d_y) * Iz(a_z,b_z,c_z,d_z)


`read_ao_integrals <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/read_write.irp.f#L1>`_
  One level of abstraction for disk_access_ao_integrals and disk_access_mo_integrals


`read_mo_integrals <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/read_write.irp.f#L2>`_
  One level of abstraction for disk_access_ao_integrals and disk_access_mo_integrals


`write_ao_integrals <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/read_write.irp.f#L3>`_
  One level of abstraction for disk_access_ao_integrals and disk_access_mo_integrals


`write_mo_integrals <http://github.com/LCPQ/quantum_package/tree/master/src/Integrals_Bielec/read_write.irp.f#L4>`_
  One level of abstraction for disk_access_ao_integrals and disk_access_mo_integrals