coq - How do I implement a GRing.Ring.sort -


i'm trying use ssreflect's matrix library complex numbers coquelicot (http://coquelicot.saclay.inria.fr/html/coquelicot.complex.html).

however, error:

the term "ket0" has type "matrix c (s (s o)) (s o)" while expected have type "matrix (gring.ring.sort ?r) ?m ?n"

i assume gring.ring.sort kind of typeclass or canonical structure, how instantiate c member of class?


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