$\hbar = c = 1$
Utimur naturalis unitates.
We use natural units.
Mar 26, 2013
Power of -1
To compute (-1)^n one has three options,
$ (-1)^n = (-1)^{\mod(n,2)} = 1-2 \times \mod(n,2) $
i=1,2,...10^8, time in second.
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