pn_dimension
synopsis: INT pn_dimension (OP n, OP partition, OP dim);
description:
Calculates the dimension of the spin representation of
O(n) (the Pin(n) group) labelled by the partition.
An ERROR results if the number of parts exceeds n/2.
Each irreducible spin representation of O(n)
is labelled by a partition for which the number of parts
does not exceed n. In fact, for n odd, there are
further representations of Pin(n): the associates of
those for which the number of parts does not exceed n/2.
However as two-valued representations of O(n), the
distinction is lost.
return:
OK or ERROR.
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