Figure F.6a illustrates a generic two-port
description of the *series* adaptor.

As discussed in §7.2, a *series connection* is
characterized by a common velocity and forces which sum to zero at the
junction:

The derivation can proceed exactly as for the parallel junction in
§F.2.1, but with force and velocity interchanged, *i.e.*,
, and with impedance and admittance interchanged,
*i.e.*,
. In this way, we may take the
*dual* of Eq.(F.11) to get

diagrammed in Fig.F.7. Converting back to force wave variables via and , and noting that , we obtain, finally,

as diagrammed in Fig.F.6b. The one-multiply form is now

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