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Tweaked formulae for K

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Aidan Thompson
2020-06-14 13:25:11 -06:00
parent 9dec9314a2
commit 5d3f67dff4
1 changed files with 1 additions and 2 deletions
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doc/src/compute_sna_atom.rst
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@ -325,8 +325,7 @@ described by the following piece of python code:
for j in range(j1-j2,min(twojmax,j1+j2)+1,2):
if (j>=j1): print j1/2.,j2/2.,j/2.
The total number of bispectrum components is :math:`K = (J+2)(J+3)(J+4)/24`
where *J* is equal to *twojmax*\ .
For even twojmax = 2(*m*\ -1), :math:`K = m(m+1)(2m+1)/6`, the *m*\ -th pyramidal number. For odd twojmax = 2 *m*\ -1, :math:`K = m(m+1)(m+2)/3`, twice the *m*\ -th tetrahedral number.
.. note::