Kernrechtsfrage
Whether the appellant had Swiss domicile and was therefore mandatorily insured in AHV from October 2005 to 31 July 2009.
Extrahierter Entscheid
The evidence did not establish with preponderant probability that she had Swiss domicile during the disputed period.
Extrahierte Begründung
Her assertions were not substantiated by documents or other concrete indications; later references to Swiss residence and post-period mailings did not prove domicile in the relevant period.