Kernrechtsfrage
Whether the insured person's AI pension could be revised downward due to a notable change in invalidity.
Extrahierter Entscheid
The medical evidence showed an improvement in health and a 70% work capacity in suitable work; the invalidity rate was 49%, justifying replacement of the full pension by a quarter pension.
Extrahierte Begründung
The Federal Supreme Court upheld the cantonal court's reliance on the rhumatology report, found the treating doctors' opinions insufficiently reasoned or unsupported by objectively verifiable facts, and accepted the income comparison.