Synchronous reactance for a cable is discussed in the context of short-circuit impedances, as outlined in section 2.2 of the linked paper. The term "synchronous reactance" is noted as unfamiliar to some participants, indicating a need for clarity on its application. It is emphasized that synchronous reactance is specifically defined for synchronous machines, relating the induced EMF in the stator to the short-circuit current at the same excitation level. The discussion highlights a gap in understanding regarding its relevance to high power motors and generators. Overall, the conversation seeks to clarify the definition and application of synchronous reactance in electrical circuits.