Questione giuridica chiave
Whether the appeal was sufficiently reasoned to permit federal review.
Decisione estratta
No. The filing addressed only the substantive double-taxation issue and did not engage with the procedural non-entry grounds of the cantonal judgments.
Motivazione estratta
The appeal must explain, in a case-specific manner, how the challenged decision violates federal law. Because the cantonal decisions were based on procedural law, the appellant had to challenge those reasons specifically; he did not.