hi,
that means terms of order delta cubed (delta**3)......
s.auluck
> Dear Siesta Users,
> I have read the paper
> "S. Q. Wang, H. Q. Ye, J. Phys.: Condens. Matter 15 (2003) p. 5307."
> Â
> Most of the thing is clear to me, except in Equation (7) what is "O(δ^3)"
> ? What does 'O' here.
>
>
> Please guide me for the same.
>
>
> Bipul Rakshit
>
> PhD in Physics
>
> Computational Research Lab.
>
> Barkatullah University,
>
> Bhopal 462 026, India
>
> Mob.: +919713445650
>
>
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