  For a field $K$ of the second kind with respect to 2 and of characteristic
different from 2, we consider the decomposition of the binomials $x^{2^n} - a$
into a product of irreducible factors over $K$ and find the explicit form of
the minimal idempotents of the twisted group algebra $K^t< g>$ of a cyclic
2-group $<g>$ over $K$.
