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== Elements == The elements of a prism product are the prism products of their elements. This observation is in fact the motivation for the formal definition for [[abstract polytopes]] – see below. To get the element counts of a duoprism, one can write polynomials P(x) and Q(x) for its factors, so that the coefficient a<sub>k</sub> of P(x) equals the number of elements of rank ''k'' on the first polytope, and ditto for Q(x) and the second polytope. The element counts can then be read off from the polynomial P(x)Q(x). Contrast this with the [[pyramid product]], where the single element of minimal rank is included as well.
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